Guide to Selecting the Most Appropriate Aluminum Coating

Dec. 09, 2024

Guide to Selecting the Most Appropriate Aluminum Coating

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The most widespread metal used in various industries is aluminum alloys. Due to its lightweight, durability, and strength, it has many applications. Additionally, it forms a thin oxide film that makes it corrosion resistant. The oxide film only goes away after being melted at over C. However, an aluminum coating is important in increasing the aesthetics and durability of the components. The common types of aluminum coatings used include powder coating, Alodine coating, and anodizing. Here is a further insight into the best coating for your aluminum surface and why they are important.

Reasons for Aluminum Surface Finishing

The question arises why you need to make appropriate aluminum coating and yet an oxide layer already exists. We know that the oxide layer requires very high temperature for it to come off. However, modern customers and manufacturers demand a lot from aluminum parts. We subject them to the extremes that can be too much for the protective layer to withstand.

For instance, in the aerospace industry, the rockets covered with thin aluminum sheets achieve melting point temperatures of the oxide on their surfaces. The thin oxide film can easily crack due to rapid temperature variations. This increases the corrosion risk to the aluminum surface. Another instance is exposing marine parts to the highly corrosive salt water. It usually gradually corrodes away the aluminum covering. Therefore, the need to provide an additional coating to the aluminum is more for these reasons.

Overview of The Modes of Aluminum Coating

The three main modes of appropriate aluminum coating include powder coating, alodine coating, and anodizing. Here is a step by step description of the techniques.

Powder Coating

Powder coating is a newer eco-friendly technique to apply a paint coat on aluminum. The process requires a pneumatic gun to spray ionized dry powder. What makes the paint particles stick on the aluminum parts is its ionized nature. The final process is placing the part in an oven for baking. It additionally makes the powder film uniform and allows the powder and part to connect. The new layer is more corrosive resistant and wear-resistant.

Powder coating achieves a less prone cracking coating. The ionized powder sinters permanently on the material surface thus achieving this feature. Additionally, the technique is complementary to anodizing. Anodizing makes the surface porous thus the powder flows into it easily as it melts during the baking process.

Compared to liquid painting, powder coating is less toxic. However, it requires wearing of protective gear to prevent inhalation of the tiny powder particles. They are not good for your lungs.

Alodine Coating

Alodine surface finishing is an aluminum metal surface treatment that improves on its corrosion resistance. The process uses chromate as the principal electrochemical reaction to form a thin anodizing film. It does not use an electrical current to initiate the chemical coating process. Additional goals of using alodine are to increase the adhesion capabilities of the primer. It also enhances the conduction capabilities of the aluminum alloys. Despite alodine coating being cheaper, it is prone to scratches, cosmetic damage, and wears.

What&#;s The Advantage For Alodine Coating?

As one of the appropriated aluminum coating. Alodine coating has a few advantages over the other aluminum coating options. First is its short operation time that utilizes translates to less power consumption. This means you will pay less to get such services. Secondly, alodine coating works best on large volume production. One of the main features of the process is its easy maintenance of the electrochemical reaction. Lastly is how alodine coating creates thin films of the coating. They are approximately 0.5 to 5 microns thick. Additionally, the film is characteristically porous and soft. This leads to a coat that does not interfere with the properties of the aluminum alloy. Also, part size remains relatively the same even after coating it with alodine.

Anodizing

Overall, anodizing is a unique coating technique, which is one of the appropriate aluminum coatings. The process involves placing an aluminum part inside a tank with conducting liquid. Therefore, we do not add new material but instead, use the material itself to create a new coating. Then, a current with high amperage and low voltage flows through the tank and the part. Lastly, an oxide layer forms on the part. It is porous and lies on the outer surface of the part.

Anodizing creates a durable coating compared to the other coating techniques. This is because it is part of the material. However, it is a bit costlier since it requires more energy. Anodizing also achieves a matte finish making it an excellent option.

One exceptional downside of anodizing is that it decreases part conductivity. Take into consideration this disadvantage for aluminum parts for electrical appliances.

Conclusion

Consider having your aluminum parts get a powder coating, alodine coating, or anodizing to benefit from the techniques. All your parts will be corrosion resistant and have an increase in aesthetic value. Contact Creatingway now for aluminum coating services.

Creatingway is concentrated on CNC machining manufacturing, prototype machining, low-volume manufacturing, metal fabrication, and parts finishing services, provide you the best support and services. ask us one inquire now.

How to Decide Between Anodizing, Painting, and Powder Coating

CHOOSING THE RIGHT COATING FOR YOUR ALUMINUM

The purpose of this article is to help you decide what type of coating to use &#; anodizing, paint, or powder coating when specifying architectural aluminum, whether the application is metal roofing, storefront, or curtainwall. The application and desired appearance dictate the finish selected. You may also go directly to How to Specify Anodized and Painted Finishes for more direct specification information.

What Is Anodizing?

Anodizing is a simple electrochemical process developed 100 years ago that forms a protective coating of aluminum oxide on the surface of the aluminum. The lifetime of the finish is proportional to the thickness of the anodic coating applied.
Aluminum oxide is a hard, durable, weather-resistant substance that protects the base metal. The coating may be colored by dyeing or may exhibit bronze tones through diffraction phenomena produced by the coating. The coating grows from the base aluminum metal by this electrochemical process. The coating is integral to the metal and can not peel or flake. The structure of the coating is many small hexagonal pores, which are filled with a &#;seal&#; that hydrolyzes these pores to fill them with inert aluminum oxide.

In general, anodizing is less expensive than painting, with the exception of coil painted products.

Anodizing is harder than PVDF or FEVE. Anodizing is better for aluminum in high traffic areas where the coating is subject to physical abuse and abrasive cleaners.

Anodizing cannot peel off. The coating is actually part of the metal.

Anodizing gives aluminum a deeper, richer metallic appearance than is possible with organic coatings. This is because an anodized coating is translucent, and one can see the base metal underneath the coating. This translucence contributes to color variation problems, but anodizers are doing a much better job of controlling the amount of color variation than in the past. Computerized color matching with quantitative, objective color data is now commonplace in most anodizing facilities.

Anodizing is unaffected by sunlight. All organic coatings will eventually fail due to exposure to ultra-violet light.

Anodizing that is improperly sealed has poor chemical resistance. Brand new anodizing with a thin coating thickness is nearly identical in appearance to an Aluminum Association Class I (very thick!!) anodized finish, but thin (sub-Class II) anodized coatings are unsuitable for use on exterior curtainwall or metal roofing.

The advantage of a thicker anodic coating is its durability and longer life. The Achilles heel of anodizing is it&#;s chemical resistance. Eventually, the surface of an anodic coating may succumb to acidic pollutants in urban environments. Anodized surfaces, like other building components, must be protected from acidic attack during construction. The life expectancy of an anodized coating is determined by its thickness and the building&#;s environment.

After many years anodized surfaces may accumulate dirt and stains that look similar to chalking paint. This &#;chalk&#; can be removed with a mild detergent combined with an abrasive cleaning technique. A small amount of the anodic coating can actually be removed, leaving behind a renewed anodized finish which can last for another twenty years. This is why anodizers say their product is &#;renewable.&#; Once an organic coating has failed, the only options are to re-coat the surface with another paint or replace the metal. When an anodized coating appears to have failed, cleaning often results in a renewed appearance.

Anodizing & the Environment

Anodizing appears to be compatible with today&#;s environmental concerns. Though more research needs to be done to determine the total environmental impact of different aluminum finishes, from a finisher&#;s point of view, compliance with environmental regulations is easier than with other metal finishing processes. There are anodizers positioned in every major urban area, and anodizing may help products qualify for LEED (Leadership in Energy and Environmental Design) points based on regional materials.

The chemicals from anodizing can be used by municipal wastewater treatment facilities. The aluminum sulfate from anodizing plants&#; effluent actually improves the solids settling efficiency of some wastewater treatment plants. Anodizing byproducts are often beneficial, like when aluminum trihydrate is often used as a fire retardant. Anodizing emits no ozone-producing solvents (VOCs), and there are no heavy metals involved in the process.

ORGANIC COATINGS

The performance of an organic coating (paints or powders) depends on the pretreatment, resin, and pigmentation. With aluminum, the pretreatment is of utmost importance. This is why organic coatings for aluminum should be factory applied. Resins are often the weak link in an organic coating system. Some resins, such as PVDF, have outstanding weather-resistance, while epoxy coatings are meant only for interior use. There are many resins available for architectural use such as Acrylics, Urethanes, Polyurethanes, Polyesters, Silicon Polyesters, Polyester TGICs, PVDF, etc. Only a few of these coating systems will last for more than five years in exterior architectural applications. The American Architectural Manufacturers Association (AAMA) has several excellent performance specifications for aluminum coatings, and AAMA -17a is the most stringent specification for spray coated aluminum used in architecture. See AAMA Specifications for Painting Architectural Aluminum overview table here.

An important aspect of AAMA -17a is the requirement for actual ten-year exposure in South Florida. It is a good idea when evaluating different coatings request the results of Florida exposure. PVDF coatings have been shown to pass AAMA -13 in the widest variety of colors. Remember that AAMA is only for spray coatings. The right specification for coil-coatings is AAMA 620. Because coil coated processes tend to be more tightly controlled, longer-term warranties are available.

PVDF coatings are usually formulated as 70% PVDF and 30% other resins, acrylic usually predominating. While 50% PVDF coatings are available, they do not meet AAMA in as many colors. Chemical resistance and resistance to UV light are the strengths of PVDF coatings. PVDF has come to dominate the curtainwall and metal roofing markets because of its weather resistance, and because of the wide variety of colors available.

PVDF is produced by two firms: Arkema Inc and Solvay Specialty Polymers. Solvay is promoting PVDF under the trademark Hylar ® and Arkema Inc uses the tradename Kynar 500®. Today, both Solvay Specialty Polymers and Arkema are providing PVDF resin to the four companies qualified to mix this special coating: PPG Industries, Valspar, Sherwin Williams, and Akzo Nobel. There are also PVDF resins imported into the U.S. which are not Kynar or Hylar. This is why throughout this article, we have referred to these resins as PVDF whenever possible.

Advantages of PVDF Coatings

PVDF is relatively chemically inert and will outlast anodizing in corrosive environments. Window washers can be less discriminating about the types of chemicals they use to clean a building. If extremely corrosive cleaners are used, however, even PVDF will show signs of damage.

PVDF coatings offer nearly an unlimited selection of colors and are easy to manufacture in small batches.

Coil painted sheet and does not craze as badly as an anodized sheet when fabricated.

Color consistency is usually better than with anodizing. It is surprising, however, how many of our customers do not expect the slight variations that are seen in the color of painted products. Metallic metal flake coatings are especially prone to color variation. To improve color consistency, all the metal for a project should be painted by one applicator in one set-up.

Powder Coatings

Liquid paint is composed of pigment, resin, and solvent. Powder paint is simply pigment encapsulated in a powdered resin and is thus simply thought of as &#;Paint without the solvent.&#; Powder coatings and liquid coatings made from the same resin and pigment will have practically the same performance characteristics. For a given resin, the decision to use a powder or liquid coating is mainly a question of application technique.

The real advantage of powder is the reduction in air pollution compared to liquid coatings. When powders are cured in an oven, they emit no VOCs. A disadvantage of powder is the large batch sizes that are typically required. The powder manufacturers are aware of this problem and a few of them keep colors in stock that they distribute in small batches. Several companies manufacture exterior grade powders using a Polyester TGIC resin. Polyester TGIC powders are currently available in more stock colors than any other powder. Several companies stock hundreds of colors of Polyester TGIC powders. Polyester TGIC struggle with gloss retention compared to PVDF powders, but are widely used in Europe.

Some resins are more easily manufactured in liquid coatings, and some are more easily manufactured in powder coatings. A particular resin is usually manufactured in either powder or solvent-based coatings, but not both. Examples of this are epoxy which is predominantly a powder coating, and PVDF which historically has been manufactured as a liquid coating. Many of the perceived advantages of powders over liquid coatings such as hardness and gloss are actually characteristics of the resin.

Powder coatings from most manufacturers are only available in large batches, and custom colors can be very expensive. This is because each batch of powder must be ground to order using costly grinding equipment. Solvent born colors will continue to maintain their niche in the market because of the ease with which small batches can be mixed. The ability to &#;mix and match&#; gives painters and their customers unequalled flexibility and ease of use.

During the last fifteen years, PPG, Akzo, and others have introduced AAMA fluorocarbon-based powder coatings. Most of these are based on FEVE resins which are superior to Polyester coatings. PPG has introduced the PVDF Duranar powder which offers not only AAMA performance. It is also practically identical in appearance to liquid PVDF coatings. We expect the use of AAMA powder coatings to increase.

SAF also applies epoxy-based powders for interior applications such as furniture. One note of caution about powders: they are prone to orange peel, and the coating may appear to be textured.

Click to review our own SAF Painting Guidelines for Aluminum Finishing.

Environmental Considerations in a Coating Choice

Resins can theoretically be made in either solvent-born or powder coating formulations. Some resins are easier to manufacture and/or apply using solvent-borne formulations, but solvents cause air pollution. The force of regulation weighs heavily on the construction industry, especially on solvent-borne coatings. Solvent-borne coatings for long-term exterior architectural applications are mostly solvent-based where typically between 70 and 80% of each gallon of paint is evaporated during the paint curing process. Included in the fumes are hydrocarbons which are termed VOCs (volatile organic compounds) by the EPA, and are a precursor to ozone formation similar to automobile exhaust. Ozone is a major component of smog and can cause eye, lung and throat irritation. Regulations such as the Resource Conservation and Recovery Act (RCRA) and the Clean Air Act will reduce ozone formation, although local action plans vary widely. If Southern California is an indicator of future environmental regulations for the rest of the country, it may soon be illegal in the U.S. to spray many solvent-based coatings including PVDF without costly environmental equipment. This is driving up the cost of solvent-borne coatings.

Organic coating manufacturers may be forced to decide between recommending their applicators install costly pollution control equipment, or developing powder coating technology. Powder coatings produce no air pollution and are becoming full-fledged competition for anodized and solvent-borne coatings.

In order to qualify for the longest spray-coat warranties, the major PVDF coating suppliers still call for chrome-based pretreatment. A chrome pretreatment is required for long-term adhesion for exterior use, but it requires that applicators have extensive water pollution control equipment. While this technology is well known and produces excellent adhesion results, the sludge from this process is a hazardous waste and is difficult and costly to dispose of.

In light of these new developments, specifiers may wonder what the best way is to specify a long-lasting painted finish. Our advice is to consult with your finisher, specify AAMA , and to rely on the expertise of coating manufacturers like PPG, Akzo or Valspar who mix these coatings for the architectural market.

Recommendations For Curtainwall & Metal Roof Coating

PVDF coatings have dominated the curtainwall and metal roofing markets because color consistency and color selection are more important than abrasion resistance. With PVDF, a specifier may choose any color he wants, and it is likely to be readily available since most applicators have the capability to mix their own coatings.

In most situations, PVDF coatings exhibit excellent color consistency. This does not mean that color consistency is perfect with paint. Contractors must be careful to have their metal coated at the same time in the same place whenever possible to reduce the probability of color variation caused by different batches of paint or application conditions. Often there is severe color variation with three and four coat metallic PVDF coatings. Architect&#;s objections to metallic paints are reminiscent of their objections to anodizing. For more information about color variation follow this link.

Care must be taken when applying touch-up paints because a perfect match is impossible between the factory-applied finish and a finish applied in the field. Touch-up paints are a problem for both painted and anodized coatings. Touch-up paint should never be sprayed on but touched on lightly with a brush. Touch up paint will fade and chalk at a different rate than the underlying coating.

When a lively, translucent building exterior is desired, anodizing is a good finish for curtainwall. Architects should require color range panels from the anodizer. The installer should be aware of the variability expected from anodized panels. An installer may be able to sort some of the panels by elevation for the desired effect. Sorting may also be required with metallic painted coatings. If a panel is outside the approved color range, the finisher should not ship it. Importantly, it is also the installer&#;s responsibility to avoid installing metal that is not within range. When specifying anodizing for monumental use, be sure to specify SAFINISH (Aluminum Association Class I). Follow this link for an explanation of Aluminum Association Designations.

The reason for specifying SAFINISH anodizing (Class I) is to make an anodic coating as durable as possible. Coating thickness is the most significant indicator of durability for anodized coatings. Coating thickness for architectural use can be specified as either Class 1 (0.7 mils) or Class 2 (0.4 mils) per Aluminum Association DAF 45, but often there is no specification. The &#;cheapest thing&#; is then installed, and in a few short years, the finish is pitted, stained, and eroded.

Cheap anodized sheets are often sold with a coating thickness of 0.10 mils. A finish of this thickness also might be called a 200, A21, A22 or A24. While this coating thickness is suitable for many applications, specifiers should know that the integrity of this finish will not last more than a few years in exterior architectural applications. The expected lifetime is much less in coastal environments. Coating thickness makes an even more important difference in the durability of colored finishes. Colors will fade more quickly with thinner coatings because they contain less of the coloring agent.

There is often enormous pressure to sell the &#;cheapest&#; product available. If a specification simply reads &#;Clear Anodized,&#; a 0.2 mil coating is the likely result. On the other hand, if a thickness of 0.8 mils is specified, the coating will last at least four times longer. Simply restated, the life of an anodic coating is proportional to its coating thickness, and a Class I coating is twice as thick as a Class II coating. This means that in most situations, Class I coatings will last twice as long a Class II on the exterior of a building.

As previously mentioned, anodizing can be renewed by cleaning. Anodizing can often be restored when it looks like it has failed, but when painted coatings fail, there is little that can be done short of repainting the entire building. Repainting a building is normally much more expensive than the cost of the original factory applied finish, and quality control is not good on a job site. Both anodized and painted coatings require regular maintenance, something most building owners do not consider.

Storefronts

The parts of a storefront which receive the most abrasion from traffic should be anodized. Anodizing&#;s superior abrasion resistance means it will outlast paint on a door stile, kick-plate or push/pull bar. On the other hand, painting aluminum framing materials above the doors adds a nice accent to a storefront. Sometimes, one will see aluminum doors installed in a mill finish to be painted at the job site. This is always a mistake. Even if a field applied PVDF coating is used, while the resulting finish might last longer than conventional paint, its abrasion resistance would still be lacking compared to factory-applied PVDF or anodizing.

Anodizing will probably always have a place in the storefront market. Its abrasion resistance and cost-effectiveness for storefront applications are not likely to be matched by any organic coating. Specify SAFINISH coatings for the most durable, long-lasting finish.

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CONCLUSIONS

The aluminum finish of choice depends on the application and is not merely a matter of personal preference. Anodizing is best suited to storefronts, and anywhere else a rich metallic appearance is desired. Anodized and Polyester coatings are best for storefront and handrails. PVDF coatings are best suited for metal roofing and curtainwall components. Anodized, PVDF and Polyester coatings could all be used on curtainwall, roofing and storefront applications with satisfactory results.

There are many options available for finishing aluminum, which is why it is such a popular construction material. The question of which finish to apply is not always an easy decision because of all the options available. I have tried to be objective to help the specifier decide what type of coating system to use when coating architectural aluminum, whether the application is metal roofing, storefront, or curtainwall. The conclusion I hope the reader draws from this article is to communicate your needs with your finisher or your finisher&#;s suppliers. With environmental regulations being the impetus behind many new developments, there will soon be even more options to the already vast array of finishes available for aluminum.

Kynar 500® is a registered trademark belonging to ARKEMA INC.

Hylar ® is a registered trademark of Solvay Specialty Polymers Inc.

-Penn McClatchey

http://www.glassmagazine.net/articles.php?id=806

Powder coatings for aluminum

Aluminium powder coating

For powder coating to the metal surface, including aluminum, apply an electrostatic method. This method is to form an electrostatic field between the piece to be coated and the powder particles, which come from the spray gun. Powder moves under the action of compressed air and receives the output of the electric charge gun. Since coloring metallic article is grounded, the electrically charged powder particles are attracted to the surface. Due to the electric charge of the powder particles are firmly connected with the surface of aluminum parts or products, for example, aluminum profile. They are used as horizontal (figure 1), and vertical (figure 2) powder spraying systems.

See. more Aluminium powder coating

Figure 1 - Line powder coating
with horizontal hanging aluminum profiles [1]

Figure 2 &#; Line powder coating
with vertical hanging aluminum profiles [1]

In the next step of the process powder coating product coated with a powder layer supplied in a special oven, where the powder is melted and spread evenly over its surface. The temperature in the furnace is from 160 ° to 200 ° C, and the processing continues in it about 15-20 minutes, depending on the type of powder coating and the type of product to be painted. This furnace is called a polymerization oven, because it is not only the melting of the powder, but the chemical reaction between its organic components. After exiting the furnace, a uniform and durable coating on the article, which is firmly bonded to its surface.

The minimum thickness of a standard finished powder coating is from 60 micrometers. Coating thickness control is carried out with special devices (figure 3).

Figure 3 - Control of the thickness of the finished powder coating [1]

Factors appearance of a powder coating

The appearance of a powder coating depends on:

the color tone of the powder paint;

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the degree of gloss of the powder coating;

structure and surface texture, which is coated;

quantity, the size and shape of the pigments in the powder;

processing conditions in the curing oven.

Components of powder paint and their functions

Powder paints are a mixture of solid materials. Each of these materials perform their function in forming the powder coating and subsequent work.

The components of powder coatings are:

Polymer binders (level and stability of properties)

Pigments (color, appearance, resistance to climatic influences)

Additives (increasing fluidity and other functional properties)

Fillers (stabilization of the properties of a mixture of components)

The chemical composition and structure of the binders and pigments are the most important for the stability of the surface of the powder coating to the effects of weather and climatic factors.

Figure 4 - Powder paints and powder coatings [1]

Binders powder paints

The main types of organic binders in powder paints, which are used for coloring building aluminum, are:

&#; Polyester:

standard binders, which are used for painting building elements and products;

provide good resistance to climatic influences;

have various modifications;

&#; Polyurethane and acrylic:

They are the basis for coatings, which are resistant to graffiti;

more fragile, than polyester;

apply in cases, when the coating should be regularly cleaned and washed.

&#; Fluoropolymer:

the most resistant to climatic influences;

most expensive.

Standard powder coatings generally have a polyester base and always in stock manufacturers or suppliers. Cover other types of, usually, made to order.

Selection of powder coatings for aluminum

When choosing powder paints for applying them to aluminum products, the following factors are considered:

Coating appearance (color, shine)

Required protective properties of the coating for aluminum (atmospheric pollution)

Additional characteristics (for example, &#;anti-graffiti&#;, pollution resistance)

Lifetime maintenance cost (cleaning, prevention)

cost of

quality categories of powder coatings for aluminum

One of the largest manufacturers of painted aluminum for the construction industry, the German corporation Schüco, depending on the purpose of the painted aluminum products and the climatic region, in which they will work, classifies powder coatings into three main categories [1]:

Standard (facade) - polyester coatings for curtain walls, windows and doors

Special - modified polyester coating, and polyurethane and acrylic coatings

fluoropolymer

Standard powder coating is performed according to the specifications such certification organizations, as the Qualicoat and GSB in Europe or in the US AAMA. Special coatings, for example, resistant "graffiti" or fluoropolymer coatings require individual certification tests.

Standard polyester powder coating

Polyester powder coatings most often used for elements of building facades, ie curtain walls, marts, window, doors in a very wide range of colors. Conventional polyester coatings are characterized by high resistance to aging and climatic influences. these properties, as well as high production of these coatings enable their use in building envelope with warranty, for example, for the climatic conditions in Europe during the 10 years [1].

In addition to colors from the RAL, this group includes coatings coatings with special colors, for example, on scales NCS and RDS. Generally, This group covers recommended for use in European countries with moderate ultraviolet stresses and climatic influences.

Polyester coatings with improved resistance to contamination

This type of coating polyester comprises an additive, coating which provides resistance to contamination. This modification impurities complicates the ability to adhere to the surface of polyester powder coating, and also makes it less time-consuming washing and cleaning. Such powder coatings are produced in a wide range of colors, for standard coatings, and for coatings with improved resistance to climatic influences.

These powder coatings require cleaning and washing at most, than every 18 months. It provides them permanently attractive appearance and reducing their maintenance costs.

Polyester coatings with increased resistance to climate

Powder coatings increased climate resistance - a cover element for facades, which provide them with improved stability under severe climatic conditions. These climatic conditions apply, for example, combination of intense solar radiation, high temperature and high humidity. In such circumstances, the conventional polyester powder coating the surface will lose most of its color for several years. This is a result of breakage of chemical bonds in the polymer and chemical changes of pigments. Powder coatings with improved resistance to climatic influences prevent these changes in the coating composition by the use of more stable polymers and pigments. However, this is achieved by limiting the choice of colors.

Polyurethane and acrylic powder coatings

Polyurethane and / or acrylic powder coatings have special functional properties - increased resistance to "graffiti".

This property is due to the fact, These polymers - polyurethane and acrylic - provide a very dense cross-linking its molecules, and in addition, attractive appearance. The high degree of crosslinking makes the coating less convenient for the application of paints drawings spreyernymi, and also provides for easier removal of drawings.

Fluoropolymer powder coating

Currently fluoropolymer powder coatings are the most resistant to external use on building structures. The use of fluoropolymers as binder gives the best possible protection from destruction of chemical bonds under the influence of ultraviolet radiation and harsh weather conditions. Only the most stable of these pigments are used in paints, which are able to withstand both harsh conditions during their trials, and a real tough climatic influences. They can be used in virtually all climatic zones of the Earth.

Advantages of fluoropolymer powder coatings compared to known liquid PVDF paints:

no emissions of volatile organic substances harmful to the environment;

coating in a single layer, rather than two or four layers.

Source:
1. Powder Coating of Aluminium Surfaces - Technical Information Corporation Schüco, .

See. also The quality control of coating powders: indicators, methods, standards - Guide

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How to Choose an Aluminum Coil? - CHAL

Do you know aluminum coils? Have you heard of the aluminum coil? aluminum coil? aluminum coil? What do they mean? Why are there so many types of aluminum coils? How should I choose? This article will introduce you in detail to why there are so many models of aluminum coils.

An aluminum coil (aluminum coil) is a metal product for flying shear after rolling and bending corner processing by casting and rolling mill. Aluminum coil is a metal material widely used in electronics, packaging, construction, machinery, and other fields. At present, according to the different metal elements contained in aluminum coils, aluminum coils are roughly divided into 9 categories, namely 9 series.

Aluminum Coil Classification

The Key to Choosing Aluminum Coil

When we choose aluminum coils, it should be noted that choosing the right aluminum coil alloy directly depends on the performance and specific use scenarios. Before buying aluminum coils, you must pay attention to liquidity:

Tensile strength

Thermal conductivity

Weldability

Formability

Corrosion resistance

For most companies that need aluminum coils as raw materials for secondary processing, the key to choosing high-quality aluminum coils is to choose a good aluminum coil supplier. My recommendation is CHAL Aluminium Corporation. CHAL is a professional supplier of aluminum coils. The price advantage of aluminum coils has always been an important reason why Chal has been welcomed by customers from all over the world. Provide high-quality aluminum coils from China to customers all over the world. If you want to buy high-quality aluminum coils, you can consult the sales staff of Chal, they will give you high-quality services and meet your requirements. If you want to buy high-quality aluminum coils, you can consult the sales staff of Char, they will give you high-quality service and recommend the aluminum coils that are suitable for you.

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If you are looking for more details, kindly visit China pvdf coated aluminium coil factory.

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Guide to Selecting the Most Appropriate Aluminum Coating