Duplex-layered manganese phosphate conversion coating on AZ31 Mg alloy and its initial formation mechanism

被引：54
作者：
Cui, Xue-jun
Liu, Chun-hai
Yang, Rui-song
Fu, Qing-shan
Lin, Xiu-zhou
Gong, Min
机构：
[1] Sichuan Univ Sci & Engn, Mat Corros & Protect Key Lab Sichuan Prov, Zigong 643000, Peoples R China
[2] Sichuan Univ Sci & Engn, Coll Mat & Chem Engn, Zigong 643000, Peoples R China
来源：
CORROSION SCIENCE | 2013年 / 76卷
关键词：
Magnesium; Acid solution; SEM; Polarization; Passive films; AZ91D MAGNESIUM ALLOY; CORROSION BEHAVIOR; CHEMICAL CONVERSION; ROOM-TEMPERATURE; RECENT PROGRESS; FILM; GROWTH; MICROSTRUCTURE; PROTECTION; RESISTANCE;
D O I：
10.1016/j.corsci.2013.07.024
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 coating were investigated using SEM, EDS, SPM and electrochemical methods. A three-stage mechanism for initial formation of the coating was proposed: Dissolution of the loose oxide film and deposition of Mg-3(PO4)(2) and AlPO4, formation of a composite intermediate layer of Mg-3(PO4)(2), AlPO4 and Mg(OH)(2), and deposition of manganese phosphate nuclei followed by growth and lamination of the nuclei. The nuclei preferentially deposit at the Al-Mn phase surface and near the grain boundary. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：474 / 485
页数：12
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