新能源汽车用变形镁合金表面改性实验研究

Experimental Research on Surface Modification of Wrought Magnesium Alloy for New Energy Automobile

表面改性是提高镁合金耐蚀性的重要手段之一。以新能源汽车用变形镁合金AZ31B为研究对象,采用电镀工艺对其进行表面改性。分析了表面改性后镁合金的形貌及镀层的成分,并研究了镁合金裸基体及热处理前后镀层的耐蚀性。结果表明:镀层组织比较致密且与基体结合紧密,能够提高镁合金的耐蚀性。适当的热处理对提高镀层的耐蚀性有利。

Surface modification was one of the most important means for improving the corrosion resistance of magnesium alloy. Taking wrought magnesium alloy AZ31B for new energy automobile as the research object, and surface modification of magnesium alloy was carried out by using electroplating process. The morphology and composition of magnesium alloy after surface modification were analyzed, and the corrosion resistance of magnesium alloy bare substrate and the coating before and after heat treatment were studied. Results showed that the coating has a compact structure and a good adhesion with the substrate, and it can improve the corrosion resistance of magnesium alloy. Proper heat treatment was helpful to improve the corrosion resistance of the coating.