Introduction to the surface treatment method of aluminum plate and strip
The influence of surface treatment on aluminum sheet and strip
Different surface treatment methods have different effects on the performance of aluminum sheet and strip. The mechanical treatment method makes the surface more flat and smooth, but it cannot change the chemical composition and structure of the aluminum plate, so it does not have much effect on the mechanical properties of the aluminum plate. Chemical treatment can improve the surface properties of aluminum sheets, improve their corrosion resistance and weldability. The electrochemical treatment can change the microstructure of the aluminum plate, enhance its surface hardness and toughness, and also improve its corrosion resistance.
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For the use needs of different industries and fields, the surface treatment method will also be different. For example, the automobile manufacturing industry has strict requirements for aluminum plate and strip, which requires the surface to be treated with chemical and electrochemical mixtures to increase its corrosion resistance and microstructure hardness; The aerospace industry pays more attention to the flatness and finish of the surface of aluminum strips, so as to process its surface by mechanical treatment.
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Common surface treatment technology of aluminum sheet and strip
The following is an introduction to the common surface treatment technology of aluminum plate and strip.
1. Electroplating technology
Electroplating technology is mainly to electrolyze and deposit a layer of metal film on the surface of aluminum plate and strip, such as chromium, nickel, tin, copper, silver, gold, etc., so as to improve its hardness, corrosion resistance and aesthetics. Common electroplating processes include electrochrome plating, electroplating copper, electrogalvanizing, electrotin plating, etc.
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2. Oxidation technology
Oxidation technology is currently the most widely used surface treatment technology, which is divided into two types: anodic oxidation and cathodic oxidation. The anodizing process can enhance the surface hardness and corrosion resistance of aluminum strips, and at the same time, it can also produce colorful colors and beautiful appearances. Cathodizing is often used to form tan or black electrolytic alumina films.
3. Chemical treatment technology
Chemical treatment technologies mainly include pickling, alkali washing, acid-alkali composite washing, etc. Among them, pickling is to treat the surface film of aluminum plate and strip, the inherent film and the residue of metal inclusions such as iron, copper, and cast iron. Caustic washing is mostly used to treat organic pollution and silicon film residue on the surface of aluminum plate and strip. Acid-base composite washing is often used to remove relatively complex aluminum surface contaminants at the same time.