摘要
在某轿车门板所使用的AZ31B镁合金点焊接头表面通过化学镀的方法形成Ni-P镀层,通过腐蚀质量损失和电化学腐蚀分析有或无镀层情况下母材与焊点的耐蚀性能。结果表明,母材Ni-P镀层表面微观形貌优于焊点Ni-P镀层表面微观形貌,60 min内形成的镀层厚度分别为8.10和9.90μm。同一时间内无论有或无镀层,母材的质量损失均低于焊点,腐蚀速率近似线性增加,有镀层时增加趋势缓慢。形成Ni-P镀层后,焊点和母材的自腐蚀电位提高,自腐蚀电流减小,显著降低腐蚀速率。
The Ni-P coating was formed on spot-welded joint of AZ31 B magnesium alloy by electroless plating process,AZ31 B magnesium alloy is applied for making door of car. The corrosion resistance performances of the solder joint and base metal with and without coating are analyzed by weight loss test and electrochemical test. The results show that the electroless plating microstructure of base metal is better than that the solder joint and the coating thickness formed within 60 min for the solder joint and base are 8. 10 μm and 9. 90 μm,respectively. The base material weight loss is lower than that of the solder joint in the same corrosion time no matter with or without coating,the corrosion rate is linearly increased,but the increasing trend is slowly for the case with the coating. The corrosion potential and corrosion current is improved by the formation of Ni-P coating,so the corrosion rate is remarkably decreased.
出处
《有色金属工程》
CAS
CSCD
北大核心
2015年第6期20-23,共4页
Nonferrous Metals Engineering
关键词
镁合金
NI-P镀层
腐蚀
分析
magnesium alloy
Ni-P coating
corrosion
analysis
