Er对AP65镁合金组织与电化学性能的影响
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摘要
采用金相显微技术、静态浸泡腐蚀、动电位扫描法和恒电流法等方法观测了AP65-x%Er镁合金的显微组织、在3. 5%NaCl(质量分数)溶液中的静态析氢速率、塔菲尔曲线、恒电流极化曲线,研究了稀土元素Er对AP65镁合金负极材料的显微组织和电化学性能的影响.结果表明:加入元素Er的AP65镁合金胞状晶组织转变为树枝晶组织、晶粒细化; AP65-x%Er镁合金的自腐蚀析氢速率显著降低、自腐蚀电位负移、腐蚀电流密度降低;恒电流放电时,反应产物随阴极相脱落物理破坏,阳极极化减弱,电化学反应活性增大,电位负移.
The effect of Er on microstructure of AP65-x% Er magnesium alloy is investigated by metallographic microscopy. The static hydrogen evolution rate in 3. 5% NaCl mass fraction solution is tested by the static immersion corrosion. The influence of Er on the electrochemical properties of AP65 magnesium is researched by potentiodynamic scanning and galvanization. The result shows that the cellular structure of AP65 alloy with Er changes into dendritic structure and the grain refines. The addition of Er can decrease the hydrogen evolution rate and the corrosion current density of AP65-x% Er magnesium alloy,the corrosion potential of AP65-x% Er magnesium alloy shifts negatively. During constant current discharge,the reaction product is destroyed with the physically flaking of the cathodic phase,the anodic polarization weakens,the electrochemical reactivity increases and the potential shifts negatively.
The effect of Er on microstructure of AP65-x% Er magnesium alloy is investigated by metallographic microscopy. The static hydrogen evolution rate in 3. 5% NaCl mass fraction solution is tested by the static immersion corrosion. The influence of Er on the electrochemical properties of AP65 magnesium is researched by potentiodynamic scanning and galvanization. The result shows that the cellular structure of AP65 alloy with Er changes into dendritic structure and the grain refines. The addition of Er can decrease the hydrogen evolution rate and the corrosion current density of AP65-x% Er magnesium alloy,the corrosion potential of AP65-x% Er magnesium alloy shifts negatively. During constant current discharge,the reaction product is destroyed with the physically flaking of the cathodic phase,the anodic polarization weakens,the electrochemical reactivity increases and the potential shifts negatively.
引文
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[15]欧阳春,雷霆,唐炜,等.镁合金表面电化学阳极沉积氧化镁膜及其耐腐蚀性[J].粉末冶金材料科学与工程,2010,15(3):271-276.
[16]Chen S,Li J,Hu G,et al.Effect of Zn/Mg ratios on SCC,electrochemical corrosion properties and microstructure of AlZn-Mg alloy[J].Journal of Alloys and Compounds,2018,757:259-264.
[2]Polmear I J.Magnesium alloys and applications[J].Metal Science Journal,1994,10(1):1-16.
[3]余琨,宋觉敏,蔡志勇,等.镁及镁合金电池阳极材料的研究、开发及应用[J].金属功能材料,2010,17(4):66-71.
[4]Zheng T,Hu Y,Zhang Y,et al.Composition optimization and electrochemical properties of Mg-Al-Sn-Mn alloy anode for Mg-air batteries[J].Materials&Design,2018,137:245-255.
[5]Hongyang Z,Pei B,Dongying J U.Electrochemical performance of magnesium alloy and its application on the sea water battery[J].Journal of Environmental Sciences,2009,21:88-91.
[6]张高会,张平则,潘俊德.镁及镁合金的研究现状与进展[J].世界科技研究与发展,2003,25(1):72-78.
[7]Candan S,Candan E.Comparative study on corrosion behaviors of Mg-Al-Zn alloys[J].Transactions of Nonferrous Metals Society of China,2018,28(4):642-650.
[8]彭文静,金和喜,刘伟成.Zn元素对AP65镁阳极材料腐蚀速率的影响[J].矿冶工程,2015,35(3):131-134.
[9]金和喜.合金元素及固溶处理对AP65镁阳极组织和性能的影响[M].长沙:中南大学出版社,2012:24-42.
[10]张晋涛,陈乐平,尹健,等.微量Er对ZM5镁合金微观组织及腐蚀性能的影响[J].铸造技术,2012,33(2):160-163.
[11]刘楚明,葛位维,李慧中,等.Er对铸态AZ91镁合金显微组织和耐腐蚀性能的影响[J].中国有色金属学报,2009,19(5):847-853.
[12]李连强,任丽彬,刘元刚,等.海水电池Mg-Er-Zr合金阳极的电化学行为研究[J].电源技术,2017(4):585-586.
[13]龙晋明,郭忠诚,朱晓云,等.稀土对Mg合金组织及阻燃性能的影响[J].昆明理工大学学报(自然科学版),2005,30(5):15-19.
[14]Song G.Recent Progress in Corrosion and Protection of Magnesium Alloys[J].Advanced Engineering Materials,2010,7(7):563-586.
[15]欧阳春,雷霆,唐炜,等.镁合金表面电化学阳极沉积氧化镁膜及其耐腐蚀性[J].粉末冶金材料科学与工程,2010,15(3):271-276.
[16]Chen S,Li J,Hu G,et al.Effect of Zn/Mg ratios on SCC,electrochemical corrosion properties and microstructure of AlZn-Mg alloy[J].Journal of Alloys and Compounds,2018,757:259-264.
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