Modification Surface Treatment of ZM5 Mg Alloy by High-energy Micro-arc Spark Alloying S331

Chen Changjun1; Zhang Min1; Zhang Shichang1; Fang Zhigang3; Chang Qingming1; Zhou Jialin1

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Modification Surface Treatment of ZM5 Mg Alloy by High-energy Micro-arc Spark Alloying S331
Vol. 29, Issue 9, Pages: 795-797(2009)
Published： 2009 ，
DOI：

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[1]陈长军,张敏,张诗昌,方志刚,常庆明,周加林.ZM5镁合金表面高能微弧火花沉积S331铝合金研究[J].特种铸造及有色合金,2009,29(09):795-797+777-778.

Chen Changjun1, Zhang Min1, Zhang Shichang1, et al. Modification Surface Treatment of ZM5 Mg Alloy by High-energy Micro-arc Spark Alloying S331. [J]. Special Casting & Nonferrous Alloys 29(9):795-797(2009)
[1]陈长军,张敏,张诗昌,方志刚,常庆明,周加林.ZM5镁合金表面高能微弧火花沉积S331铝合金研究[J].特种铸造及有色合金,2009,29(09):795-797+777-778. DOI：

Chen Changjun1, Zhang Min1, Zhang Shichang1, et al. Modification Surface Treatment of ZM5 Mg Alloy by High-energy Micro-arc Spark Alloying S331. [J]. Special Casting & Nonferrous Alloys 29(9):795-797(2009) DOI：

摘要

为提高ZM5镁合金的耐蚀性

采用微弧火花合金化技术进行了合金化

并用Al-Mg系的S331合金在ZM5上进行了S331铝合金沉积试验

合金化层的显微硬度（HV）从基材的85提高到250。采用金相显微镜和扫描电镜对合金化层的显微结构及元素的分布进行了分析

对合金化层的阳极动电位极化曲线也进行了测试。结果表明

合金化层的组织得到了细化

其Al、Mn元素含量高于基材中的含量

合金化层的自腐蚀电位和腐蚀电流密度均得到显著降低

合金化层的耐蚀性得到提高。

Abstract

Modification surface treatment of ZM5 Mg alloy by high-energy micro-arc spark alloying S331 was conducted to improve the corrosion resistantance of the alloy. The results reveal that the hardness of the alloying layer is improved from HV85 of the ZM5 substrate to HV250. The microstructure of the alloying layer was observed by OM （optical microscope） and SEM （scanning electron microscope）

and composition distribution in the alloying layer was determined by EPMA. Meanwhile

the corrosion behavior of the alloying layer was analyzed by the potentiodynamic polarization curve. The results show that the microstructure of alloying layer is refined

and Al and Mn element concentration is higher than that in the substrate. Self-corrosion potential and corrosion current density in the alloying layer are significantly decreased

which are responsible for the improvement of the corrosion resistance.