TY - JOUR
T1 - Growth process and corrosion resistance of micro-arc oxidation coating on Mg-Zn-Gd magnesium alloys
AU - Wang, Ping
AU - Liu, Dao Xin
AU - Li, Jian Ping
AU - Guo, Yong Chun
AU - Yang, Zhong
PY - 2010/11
Y1 - 2010/11
N2 - A Mg-6Zn-3Gd (mass fraction, ) alloy, noted as ZG63, was coated by different micro-arc oxidation (MAO) processes, and the coating structure and corrosion resistance of the alloy were studied using scanning electron microscopy (SEM), glancing angle X-ray diffractometry (GAXRD) and various electrochemical methods. The micro-arc oxidation process consists of three stages and corresponds with different coating structures. In the initial stage, the coating thickness is linearly increased and is controlled by electrochemical polarization. In the second stage, the coating grows mainly inward and accords with parabolic regularity. In the third stage, the loose coating forms and is controlled by local arc light. The looser coating is mainly composed of MgSiO3 and the compact coating is mainly composed of MgO. From micro-arc oxidation stage to local arc light stage, the corrosion resistance of the coated alloy firstly increases and then decreases. The satisfied corrosion resistance corresponds to the coating time ranging from 6 to10 min.
AB - A Mg-6Zn-3Gd (mass fraction, ) alloy, noted as ZG63, was coated by different micro-arc oxidation (MAO) processes, and the coating structure and corrosion resistance of the alloy were studied using scanning electron microscopy (SEM), glancing angle X-ray diffractometry (GAXRD) and various electrochemical methods. The micro-arc oxidation process consists of three stages and corresponds with different coating structures. In the initial stage, the coating thickness is linearly increased and is controlled by electrochemical polarization. In the second stage, the coating grows mainly inward and accords with parabolic regularity. In the third stage, the loose coating forms and is controlled by local arc light. The looser coating is mainly composed of MgSiO3 and the compact coating is mainly composed of MgO. From micro-arc oxidation stage to local arc light stage, the corrosion resistance of the coated alloy firstly increases and then decreases. The satisfied corrosion resistance corresponds to the coating time ranging from 6 to10 min.
KW - corrosion resistance
KW - growth process
KW - Mg-6Zn-3Gd magnesium alloys
KW - micro-arc oxidation
UR - http://www.scopus.com/inward/record.url?scp=78650107102&partnerID=8YFLogxK
U2 - 10.1016/S1003-6326(09)60442-8
DO - 10.1016/S1003-6326(09)60442-8
M3 - 文章
AN - SCOPUS:78650107102
SN - 1003-6326
VL - 20
SP - 2198
EP - 2203
JO - Transactions of Nonferrous Metals Society of China (English Edition)
JF - Transactions of Nonferrous Metals Society of China (English Edition)
IS - 11
ER -