孙瑞雪

教授

教授 硕士生导师

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所在单位:材料学院综合办公室

学历:博士研究生

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An environment-friendly calcium phosphate conversion coating on AZ91D alloy and its corrosion resistance

发布时间:2023-10-19 点击次数:

关键字:the coating was evaluated by potentiodynamic polarization test in 3.5wt% NaCl solution. Result
摘要:An environment-friendly phosphate conversion coating free of chromate, fluorides, and nitrite was developed on AZ91D alloy through a facile chemical deposition method. The surface morphology and phase composition of the coating were characterized by field-emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). The corrosion resistance of the coating was evaluated by potentiodynamic polarization test in 3.5wt% NaCl solution. Results indicate that the calcium phosphate coating was composed of a large number of leaf-like and flower-like particles. The chemical composition of the conversion coating was CaHPO4 center dot 2H(2)O crystals. The coating can remarkably reduce the corrosion current density of the substrate. Introduction of triethanolamine (TEA) additive into the phosphating bath leads to denser coating and high anticorrosive property of the phosphate coating.
卷号:66
期号:4
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