Study on Precipitates in the Corrosion in situ of the Al-Zn-In-Mg-Ti-Si Sacrificial Anode Alloys
The Al-5Zn-0.03In-1Mg-0.05Ti-0.1Si (wt %) alloy was found to be with excellent electrochemical performance. Corrosion behavior of the alloy was investigated by SEM, EDX and HRTEM in this paper. The results show that the main precipitates in the alloy are the MgZn2 (η -phase) and Si type. The η -precipitate is anodic to the alloy base, so anodic dissolution and corrosion occurs on its surface. The η precipitates can be acted as activation center, resulting in alloy dissolution and the breakdown of aluminum oxide barrier film. This is confirmed by the results of the SEM observation. Si phase in the alloy cannot be corroded by the analysis of SEM results. But it can be clearly distinguished that the Si precipitates is cathodic to the alloy base, resulting in the anodic dissolution and corrosion of the alloy base at its adjacent periphery by the analysis of HRTEM results.
WEN Jiu-ba MA Jing-ling LU Xian-Wen
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471
国际会议
桂林
英文
1-4
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）