Thread Content
Taking into account the previous background on uniform corrosion of aluminum alloys, the electrophoretic coating composite protection process is the one that offers the most effective comprehensive protection against such corrosion. Key performance advantage: This process first creates a dense Al₂O₃ layer on the surface of the aluminum alloy through anodization, followed by electrophoretic deposition of a highly dense paint film thickness of 15–20 μm. This results in a dual-layer composite protective structure that effectively prevents corrosion from acids, bases, salts, and other corrosive agents. In harsh environments, it can resist corrosion and aging for over 50 years, offering significantly better corrosion resistance compared to conventional anodization or single-coating methods. Comparison with other mainstream processes: Ordinary anodization results in a thin coating layer; rust spots appear after 280 hours of salt spray testing. It can only handle mild corrosive environments and is unable to resist uniform corrosion caused by strong acids and bases. Single epoxy coating: It has limited adhesion to aluminum alloy substrates, and local peeling of the coating can occur over time, failing to prevent the spread of uniform corrosion consistently. Rigid anodization: It is aimed at improving wear resistance; its corrosion resistance is weaker than that of coating-based methods, and it cannot withstand strong acids or bases, making it unsuitable for applications where corrosion prevention is the primary requirement.