Duplex-layered manganese phosphate conversion coating on AZ31 Mg alloy and its initial formation mechanism
作者： Xue-jun Cui , Chun-hai Liu , Rui-song Yang , Qing-shan Fu , Xiu-zhou Lin
DOI: 10.1016/J.CORSCI.2013.07.024
关键词:
摘要: Abstract A duplex-layered phosphate conversion coating was obtained on AZ31 Mg alloy by substituting NaF bath with a citric bath. The morphology, composition and corrosion resistance of the were investigated using SEM, EDS, SPM electrochemical methods. three-stage mechanism for initial formation proposed: Dissolution loose oxide film deposition Mg3(PO4)2 AlPO4, composite intermediate layer Mg3(PO4)2, AlPO4 Mg(OH)2, manganese nuclei followed growth lamination nuclei. preferentially deposit at Al–Mn phase surface near grain boundary.
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