Surface treatment of LU-ZINC membrane

Surface treatment of ALU-ZINC (or GALVALUME) coatings is crucial to enhance their performance and longevity. Here's an outline of typical surface treatments applied to ALU-ZINC membranes:

Chromate Passivation: Chromate passivation is a common surface treatment applied to ALU-ZINC coatings. This process involves dipping the coated steel in a solution containing chromates, which forms a thin, protective layer on the surface. Chromate passivation improves corrosion resistance and enhances the adhesion of organic coatings.

Oiling: After passivation, ALU-ZINC coils may be coated with a thin layer of oil to provide temporary corrosion protection during storage and transportation. This oil layer helps prevent moisture and atmospheric contaminants from reaching the surface of the coating.

Resin Coating: Some ALU-ZINC coatings undergo additional surface treatment with organic resin coatings. These resin coatings can provide further protection against corrosion, abrasion, and weathering. They may also enhance the aesthetics of the surface and provide additional chemical resistance.

Anti-fingerprint Coating: In certain applications where aesthetics are critical, ALU-ZINC coils may receive an anti-fingerprint coating. This coating helps to minimize the visibility of fingerprints and smudges on the surface, improving the appearance of the finished product.

Passivation Alternatives: Due to environmental concerns and regulations regarding the use of hexavalent chromium compounds, alternative passivation methods are being developed. These alternatives aim to provide similar corrosion protection without the use of hazardous substances.

Custom Surface Treatments: Depending on specific requirements and end-use applications, custom surface treatments may be applied to ALU-ZINC coatings. These treatments could include special primers, polymer coatings, or other surface modifications tailored to meet the performance demands of the application.