激光冲击次数对镁合金电化学特性的影响

李兴成; 张永康

doi:10.7510/jgjs.issn.1001-3806.2015.04.008

激光冲击次数对镁合金电化学特性的影响

李兴成^1,2,
张永康^3, ,

1.
江苏理工学院机械工程学院, 常州 213001;
2.
江苏大学机械工程学院, 镇江 212013;
3.
东南大学机械工程学院, 南京 211189

作者简介: 李兴成(1968-),男,副教授,博士研究生,现主要从事激光先进制造与检测技术方面的研究。.

通讯作者: 张永康, ykzhang@ujs.edu.cn

中图分类号: TN249;TG174.1

Effect of laser shock times on electrochemical performance of AZ31 magnesium alloy

LI Xingcheng^1,2,
ZHANG Yongkang^3, ,

1.
School of Mechanical Engineering, Jiangsu University of Technology, Changzhou 213001, China;
2.
School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China;
3.
School of Mechanical Engineering, Southeast University, Nanjing 211189, China

Corresponding author: ZHANG Yongkang, ykzhang@ujs.edu.cn

CLC number: TN249;TG174.1

摘要: 为了研究激光冲击对镁合金表面抗腐蚀性能的影响,利用钕玻璃脉冲激光对AZ31镁合金表面进行不同次数的激光冲击处理,用透射电子显微镜观察镁合金表层的微观组织,并采用电化学测量技术在氯化钠溶液(质量分数为0.035)中测试其极化曲线和电化学交流阻抗谱的影响。结果表明,激光冲击波导致镁合金表面层产生超高应变速率的塑性变形;晶粒内部存在与孪晶相互交叉、相互缠结的高密度位错而导致晶粒细化;极化曲线和交流阻抗谱表明1次激光冲击后AZ31的自腐蚀电位提高约267mV;腐蚀电流稍有增大,反应电阻增大,抗腐蚀性明显提高;随着冲击次数的增多,腐蚀抗力未明显提高。其相应的交流阻抗谱也得出与极化曲线相同的结论。该研究对于激光冲击处理镁合金提高耐腐蚀性具有一定的参考价值。
- 激光技术 /
- 激光冲击 /
- 镁合金 /
- 微观组织 /
- 极化曲线 /
- 电化学阻抗
Abstract: In order to study effect of laser shock times on corrosion resistance of AZ31 magnesium alloy, AZ31 magnesium alloy was processed at different laser shock process (LSP)times by Nd:glass laser with pulse width of 23ns. Microstructures were observed by transmission electron microscopy. Polarization curves and electrochemical impedance spectroscopy were obtained in NaCl solution with 0.035 mass fraction by means of electrochemical measurement technique. The results show that plastic deformation with ultrahigh strain rate happens because of laser shock wave at the surface layer of AZ31 magnesium alloy. High density dislocations with intersect and entanglement of twin crystal exist in the crystal grains and the dislocations led to grain refinement. Polarization curves and electrochemical impedance spectroscopy shows that corrosion potential of AZ31 increases up to 267mV after the first laser shock. Corrosion current increases slightly, reaction resistance increases and corrosion resistance is improved significantly. With the increase of impact times from LSP, corrosion resistance of alloy is not improved significantly. The corresponding impedance spectroscopy has the same conclusion with polarization curves. The study is helpful for improving the corrosion resistance of magnesium alloy during laser shocking processing.
- laser technique /
- laser shocking /
- magnesium alloy /
- microstructure /
- polarization curve /
- electrochemical impedance

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激光冲击次数对镁合金电化学特性的影响

作者简介: 李兴成(1968-),男,副教授,博士研究生,现主要从事激光先进制造与检测技术方面的研究。.

通讯作者: 张永康, ykzhang@ujs.edu.cn

Effect of laser shock times on electrochemical performance of AZ31 magnesium alloy

Corresponding author: ZHANG Yongkang, ykzhang@ujs.edu.cn

计量

激光冲击次数对镁合金电化学特性的影响

通讯作者: 张永康, ykzhang@ujs.edu.cn

作者简介: 李兴成(1968-),男,副教授,博士研究生,现主要从事激光先进制造与检测技术方面的研究。

English Abstract

Effect of laser shock times on electrochemical performance of AZ31 magnesium alloy

Corresponding author: ZHANG Yongkang, ykzhang@ujs.edu.cn

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留言板

激光冲击次数对镁合金电化学特性的影响

作者简介: 李兴成(1968-),男,副教授,博士研究生,现主要从事激光先进制造与检测技术方面的研究。.

通讯作者: 张永康, ykzhang@ujs.edu.cn

Effect of laser shock times on electrochemical performance of AZ31 magnesium alloy

Corresponding author: ZHANG Yongkang, ykzhang@ujs.edu.cn

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激光冲击次数对镁合金电化学特性的影响

通讯作者: 张永康, ykzhang@ujs.edu.cn

作者简介: 李兴成(1968-),男,副教授,博士研究生,现主要从事激光先进制造与检测技术方面的研究。

English Abstract

Effect of laser shock times on electrochemical performance of AZ31 magnesium alloy

Corresponding author: ZHANG Yongkang, ykzhang@ujs.edu.cn

全文HTML

目录