TY - JOUR
T1 - Growth mechanism and corrosion resistance of micro-arc oxidized coating of Mg-Gd-Y alloy
AU - Wang, Ping
AU - Liu, Daoxin
AU - Li, Jianping
AU - Yang, Zhong
AU - Guo, Yongchun
PY - 2011/6
Y1 - 2011/6
N2 - A Mg-11Gd-1Y-0.5Zn(wt%) alloy was coated by different micro-arc oxidation (MAO) processes, and the coating structure and corrosion resistance of the alloy were studied by scanning electron microscopy (SEM), glancing angle X-ray diffraction (GAXRD) and various electrochemical methods. The micro-arc oxidation process used for the alloy consists of 3 stages, corresponding with different coating structures. In the initial stage, the coating thickness is linearly increased and controlled by electrochemical polarization. In the second stage, the coating is mainly inward growth and accords with parabolic regularity. In the third stage, the loose coating is formed and controlled by local arc light. The loose coating is mainly composed of MgSiO3 and the compact coating is mainly of MgO. From the stage of micro-arc oxidation to that of local arc light, the corrosion resistance of the coated alloy is firstly increased and then decreased. The satisfied corrosion resistance corresponds to the coating time ranging from 7 to 12 min.
AB - A Mg-11Gd-1Y-0.5Zn(wt%) alloy was coated by different micro-arc oxidation (MAO) processes, and the coating structure and corrosion resistance of the alloy were studied by scanning electron microscopy (SEM), glancing angle X-ray diffraction (GAXRD) and various electrochemical methods. The micro-arc oxidation process used for the alloy consists of 3 stages, corresponding with different coating structures. In the initial stage, the coating thickness is linearly increased and controlled by electrochemical polarization. In the second stage, the coating is mainly inward growth and accords with parabolic regularity. In the third stage, the loose coating is formed and controlled by local arc light. The loose coating is mainly composed of MgSiO3 and the compact coating is mainly of MgO. From the stage of micro-arc oxidation to that of local arc light, the corrosion resistance of the coated alloy is firstly increased and then decreased. The satisfied corrosion resistance corresponds to the coating time ranging from 7 to 12 min.
KW - Corrosion resistance
KW - Growth mechanism
KW - Mg-Gd-Y magnesium alloys
KW - Micro-arc oxidation
UR - http://www.scopus.com/inward/record.url?scp=79960570681&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:79960570681
SN - 1002-185X
VL - 40
SP - 995
EP - 999
JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
IS - 6
ER -