高锰ZA35合金中富锰相的电化学行为  

Electrochemical Behavior of Mn-enriched Phase in High Mn ZA35 Alloy

作　　者：刘敬福[1,2] 崔佳[1] 李荣德[2] 宋建[2] 陈鹏飞[2] 

机构地区：[1]辽宁工程技术大学材料科学与工程学院 [2]沈阳工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2011年第6期510-513,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50874075);辽宁省创新团队资助项目(2008T137);沈阳市科研资助项目(F10-205-1-49)

摘　　要：为了探索析出的富锰相对高锰ZA35合金电化学腐蚀性能的影响规律,根据高锰ZA35合金中富锰相的元素组成,熔炼出析出相MnAl6。采用动电位极化方法测试了富锰相MnAl6和ZA35-1.2Mn合金在NaCl水溶液中的开路电位和极化曲线,利用X-射线衍射仪(XRD)检测了合金的相组成。结果表明,随着NaCl溶液温度升高,合金的开路电位下降,并且富锰相MnAl6较ZA35-1.2Mn合金的开路电位低,富锰相MnAl6较ZA35-1.2Mn合金腐蚀电流密度大。ZA35-1.2Mn合金在NaCl含量为3.5%的溶液中,析出的富锰相MnAl6将作为阳极区优先溶解。Precipitate phase MnAl6 was fabricated based on element distribution of Mn-enriched in high Mn ZA35 alloy to understand effects of precipitated phase on electrochemical behavior of high Mn ZA35 alloy. Open circuit potential against time and polarization curves of Mn-enriched phase MnAl6 and ZA35-1.2Mn in NaCl aqueous solution were measured by potential dynamic polarization, and phase constituent of the alloy was examined by XRD （X-ray diffraction）. The results show that with increasing in temperature of NaCl solution, the open-circuit potential （OCP）of the alloy is shifted gradually into the negative direction, and the OCP of the Mn-enriched phase MnAl6 is lower than that of ZA35-1.2Mn alloy, while corrosion current density is higher than that of the ZA35-1.2 Mn alloy. The precipitate MnAl6 phase in ZA35-1.2Mn alloy is dissolved preferentially as anode zone in 3.5% NaCl aqueous solution.

关 键 词：富锰相 ZA35合金-1.2Mn 动电位极化 开路电位 极化曲线 

分 类 号：TG172[金属学及工艺—金属表面处理]