镁合金点焊接头组织的耐蚀性
The Corrosion Resistance of Magnesium Alloy Spot Welding Joint
摘 要
为提高镁合金焊点的耐蚀性,利用DN-100型固定式点焊机对AZ31B镁合金进行焊接,经拉伸试验和金相观察得出最佳焊接参数下的焊点,对该焊点的耐蚀性进行测试.根据母材及焊点试样在3.5% NaCl溶液中腐蚀不同时间的微观组织观察发现,焊点及母材均不耐蚀.通过对焊点试样和表面化学镀后的焊点试样进行电偶腐蚀试验,经极化曲线分析得出,化学镀后的焊点试样耐蚀性提高.化学镀膜层在-0.2~0.5 V(SCE)腐蚀电位区间,电流变化很小,表现出了明显的钝化特征.
点焊
耐蚀性
magnesium alloy
spot welding
corrosion resistance
Abstract
In order to improve the corrosion resistance of magnesium alloy welding joints,a DN-100 stationary spot welder was used to weld AZ31B magnesium alloy.The best welding parameters of spot weld were achieved by tensile test and metallographic observation,and the corrosion resistance testing for the spot weld was performed.According to the microstructure observation of the parent metal and weld corrosion samples in 3.5% NaCl solution at different times,the results showed that both joint and parent metal didn′t have good corrosion resistance.After electroless plating on the surface of welding joint and base metal samples for galvanic corrosion test,the polarization curve analysis indicated that through chemical plating the corrosion resistance of welding samples improved.Chemical coating layer within the range of -0.2~0.5 V(SCE) corrosion potential the current changed little,showing obvious passivation characteristics.
中图分类号 TG174 DOI 10.11973/fsyfh-201507009
所属栏目 试验研究
基金项目
收稿日期 2014/6/23
修改稿日期
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备注马天凤(1982-),讲师,硕士研究生,从事焊接工艺与设计的研究.
引用该论文: MA Tian-feng,LI Ze,CHENG Yan-yan. The Corrosion Resistance of Magnesium Alloy Spot Welding Joint[J]. Corrosion & Protection, 2015, 36(7): 640
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