Effects of Heat Treatments on Corrosion Behavior of Mg AT72 Alloy
The effects of heat treatments,including T4,T5,T6 treatments,on corrosion behaviors of Mg-7Al-2Sn (AT72) alloy processed by high vacuum die casting have been investigated.The optical microscope,scanning electron microscope observations were used to analyze the microstructures,especially the distribution of second phase,phase contents and grain size.The hydrogen evolution tests,electrochemical methods including open circuit potential curves and polarization curves were used to describe the corrosion properties as well.The results indicated that different heat treatments had influence on microstructures,especially distribution of second phase,phase contents and grain sizes.The existence of second phase had a relationship with corrosion properties,in which the as-cast samples showed low corrosion rate in hydrogen evolution tests while the heat treatment methods had little impact on improving corrosion resistance.The electrochemical analyses also agreed with this observation.Based on these results,the optimized heat treatment method for corrosion resistant AT72 magnesium alloy has been established.
Heat treatment Corrosion Magnesium alloy Electrochemical test
Zhiqin Wang Dejiang Li Xiaoqin Zeng Xiaomei Wu Wenjiang Ding
School of Materials Science and Engineering, The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan RD. Minhang District, Shanghai 200240, China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
230-237
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）