A chrome-free conversion coating for magnesium–lithium alloy by a phosphate–permanganate solution

A chrome-free conversion coating on magnesium–lithium alloy was obtained from a phosphate–permanganate solution. The morphology, the composition and the corrosion resistance of this coating were examined. The thin and non-penetrating cracked morphology with some deposits existed on the phosphate–per...

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Bibliographic Details
Published in:Surface & coatings technology 2008-02, Vol.202 (9), p.1825-1830
Main Authors: Zhang, Hua, Yao, Guangchun, Wang, Shulan, Liu, Yihan, Luo, Hongjie
Format: Article
Language:English
Subjects:
Applied sciences
Chrome-free conversion coating
Corrosion
Corrosion environments
Corrosion resistance
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Magnesium–lithium alloys
Materials science
Metallic coatings
Metals. Metallurgy
Phosphate–permanganate
Physics
Production techniques
Surface treatment
Surface treatments
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Description
Summary:A chrome-free conversion coating on magnesium–lithium alloy was obtained from a phosphate–permanganate solution. The morphology, the composition and the corrosion resistance of this coating were examined. The thin and non-penetrating cracked morphology with some deposits existed on the phosphate–permanganate conversion coating. The main elements of the conversion coating were Mg, O, K, P and Mn. The results of the electrochemical measurements and the immersion tests demonstrated that the corrosion resistance of the magnesium–lithium alloy has been improved by the phosphate–permanganate conversion treatment.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2007.07.094