Preparation of Trivalent Chromium and Rare Earth Composite Conversion Coating on Aluminum Alloy Surface

5th Annual International Conference on Material Science and Environmental Engineering

材料科学;生态环境科学

Huang, Jianzhen^1

Foshan Supervision and Testing Centre of Quality and Metrology, Foshan, GUANGDONG

528000, China^1

关键词: 6063 aluminum alloy;    Chemical plating;    Conversion coatings;    Conversion film;    Film forming agent;    Sodium phosphate;    Surface conversions;    Trivalent chromium;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/301/1/012089/pdf
DOI  :  10.1088/1757-899X/301/1/012089

来源: IOP

【 摘 要 】

In this paper, the surface conversion film on 6063 aluminum alloy was prepared by chemical plating process with chromium sulfate, lanthanum sulfate and sodium phosphate as film forming agent. The corrosion resistance and surface morphology of the conversion film were analyzed by pitting corrosion test of copper sulfate and SEM. The results show that when Cr2(SO4)3is 10 g/L, La2(SO4)3is 2 g/L, Na3PO4is 8 g/L, pH value is 3, temperature is 40 °C, reaction time is 10 min, the corrosion resistance of the surface conversion film is the best. The conversion coating is light green, composed of Cr, La, P, Al, O and other elements.