Preparation and Corrosion Resistance of Trivalent Chromium-Zirconium Composite Coating

International Conference on Computer Information and Automation Engineering

计算机科学;运输工程

Huang, J.Z.^1

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

528000, China^1

关键词: Binary conversion;    Copper sulfate;    Optimum reaction conditions;    Pure aluminum;    Surface protection;    Thin oxide layers;    Trivalent chromium;    Trivalent chromium conversion coating;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/359/1/012047/pdf
DOI  :  10.1088/1757-899X/359/1/012047

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Aluminum alloys are widely used in the various industries because of its superior advantages. However there will be a thin oxide layer on the surface of the pure aluminum to inhibit corrosion, when adding some other elements, the obtained aluminum alloy is easy to be corroded. Surface protection is an important means to improve the corrosion resistance of aluminum alloys. The formal research had already confirmed that the trivalent chromium conversion coating can significantly improve the corrosion resistance, and the usage of the zirconium solution can also protect the aluminum alloy from corrosion. In this study, we constructed the binary conversion coating with the Cr2(SO4)3 and the K2ZrF6. The optimum reaction conditions are as follows: 10g/L H3PO4, 2g/L K2ZrF6, 28g/L Cr2(SO4)3, pH=2.5∼3.5, temperature 40°C, and reaction time 10 min. Copper sulfate titration experiment confirmed that the corrosion resistance was significantly improved.