Journal
SURFACE & COATINGS TECHNOLOGY
Volume 202, Issue 9, Pages 1825-1830Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2007.07.094
Keywords
magnesium-lithium alloys; chrome-free conversion coating; corrosion resistance; phosphate-permanganate
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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. (C) 2007 Elsevier B.V. All rights reserved.
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