The production of coated aluminum sheets involves a precise, multi-step process designed to enhance the surface properties of aluminum for decorative, functional, and protective purposes. The process begins with high-quality aluminum coils, which are first cleaned and chemically pre-treated to improve coating adhesion.
Coated Aluminum Sheet Production Process
Uncoiling & Splicing:
Uncoiling: Large coils of bare aluminum (mill finish) are loaded onto an uncoiler.
Splicing (Optional but common for continuous lines): The end of one coil is often stitched or welded to the beginning of the next coil to allow for continuous operation without stopping the line. An accumulator loop provides slack during this process.
Уборка & Предварительная обработка (Решает для адгезии & Corrosion Resistance):
Degreasing/Cleaning: The aluminum strip passes through a series of cleaning tanks or spray zones. This typically involves alkaline cleaners to remove oils, жир, грязь, and other surface contaminants.
Rinsing: The strip is thoroughly rinsed with water to remove any residual cleaning solution.
Deoxidizing/Etching (Optional but common): An acidic solution may be used to remove the natural oxide layer and lightly etch the surface, creating a better micro-profile for adhesion. This is followed by another rinse.
Conversion Coating (Chemical Pre-treatment): This is a critical step. The aluminum strip is treated with a chemical solution (historically chromate-based, but increasingly non-chromate alternatives like titanium or zirconium-based are used for environmental reasons). This process forms a thin, inert conversion layer on the aluminum surface that:
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