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Formation and characterization of cerium conversion coatings on magnesium alloy 被引量:10

Formation and characterization of cerium conversion coatings on magnesium alloy
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摘要 Chemical conversion treatment by rare earth metal salt solution was considered as an alternative to chromium chemical conversion treatment to improve the corrosion resistance of magnesium alloys. In this study, cerium conversion coatings formed on AZ31 magnesium alloy were characterized and the formation mechanism was discussed. X-ray photoelectron spectroscopy (XPS) analysis showed that cerium conversion coating consisted of cerium hydroxides/oxides, in which both tetravalent cerium Ce(Ⅳ) and trivalent cerium Ce(Ⅲ) species co-existed. Cerium conversion coating was a two-layer structure. Atomic force microscopy (AFM) images revealed that the morphology of the inside layer was different from that of the outside one, which was responsible for the inherent adhesive weakness of the coating. Corrosion potential (Ecorr) measurements indicated that poor adhesion limited the improvement of the corrosion resistance of the coating. During the treating process, the increased pH value of the cerium salt solution led to the precipitation of cerium hydroxides/oxides. The formation kinetics of the coating followed a parabolic curve. Chemical conversion treatment by rare earth metal salt solution was considered as an alternative to chromium chemical conversion treatment to improve the corrosion resistance of magnesium alloys. In this study, cerium conversion coatings formed on AZ31 magnesium alloy were characterized and the formation mechanism was discussed. X-ray photoelectron spectroscopy (XPS) analysis showed that cerium conversion coating consisted of cerium hydroxides/oxides, in which both tetravalent cerium Ce(Ⅳ) and trivalent cerium Ce(Ⅲ) species co-existed. Cerium conversion coating was a two-layer structure. Atomic force microscopy (AFM) images revealed that the morphology of the inside layer was different from that of the outside one, which was responsible for the inherent adhesive weakness of the coating. Corrosion potential (Ecorr) measurements indicated that poor adhesion limited the improvement of the corrosion resistance of the coating. During the treating process, the increased pH value of the cerium salt solution led to the precipitation of cerium hydroxides/oxides. The formation kinetics of the coating followed a parabolic curve.
出处 《Journal of Rare Earths》 SCIE EI CAS CSCD 2008年第3期383-387,共5页 稀土学报(英文版)
基金 National Outstanding Youth Science Foundation of China (NSFC50725413) the National Natural Science Foundation of China (NSFC20603049) Natural Science Foundation Project of CQ (CSTC2007BB4154)
关键词 magnesium alloy cerium conversion coatine comoosition morphology formation kinetics rare earths magnesium alloy cerium conversion coatine comoosition morphology formation kinetics rare earths
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