7075 aluminum alloy hard anodizing
The hard oxidation process is used to replace the traditional hard chrome plating. Compared with the hard chrome process and the cyanide-free galvanizing process, it has the advantages of low cost, firm film bonding, convenient plating solution and convenient treatment of cleaning waste liquid.
7075 aluminum alloy is a cold-treated forging alloy with high strength, far better than mild steel. 7075 is one of the more powerful alloys for commercial use. 7075 aluminum alloy has a compact structure, strong corrosion resistance, good mechanical properties and anode reaction. The fine grain makes the deep drilling performance better, the tool wear resistance is enhanced, and the thread rolling is more distinctive.
However, the surface hardness of the 7075 aluminum alloy is low and it is not wear-resistant. The application range is limited. The hard anodizing (anodic hardening) treatment of the 7075 aluminum alloy can obtain a film layer with good adhesion to the substrate and a certain thickness. Used in aluminum transmission splines, bearing mounting positions, threaded fastenings, etc.
After anodic hardening of 7075 aluminum alloy, the thickness of the oxide film can be 30μm-50μm, and the hardness is 50-55HRC, which can make the aluminum material meet the spline requirements. (The electrolyte is oxalic acid, DC, the electrolysis temperature is below 0 °C, and the oxidized color is yellowish green with metallic luster)。
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