水浸搅拌摩擦焊铝/镁接头腐蚀行为研究

Corrosion Behavior of Submerged Friction Stir Welded AZ31B Magnesium Alloyand 6061 Aluminum Alloy Dissimilar Joints

以水浸环境下铝/镁搅拌摩擦焊异质接头为研究对象,研究接头的电化学腐蚀行为。结果表明,在转速700~1000r/min范围内,接头表面和内部均无明显缺陷,在焊核区两种材料发生了较大程度的混合;焊缝不同区域的耐腐蚀性能由好到差排序为:BM-6061>BM-AZ31B>SZ;随着主轴转速的增加,接头的自腐蚀电位升高,腐蚀电流密度的提高,即主轴转速的增大会导致接头的腐蚀倾向减小而腐蚀速率增大,接头的耐腐蚀性能降低。

The electrochemical corrosion behavior of submerged friction stir welded aluminum/magnesiumdissimilar joints was studied.The results showed that within the rotational speed of 700r/min to 1000r/min,there were noobvious defects on the surface and inside of the joint,and there was a significant mixing of the two materials at stir zone;The corrosion resistance of different areas of the weld seam is ranked in descending order:BM-6061>BM-AZ31B>SZ.As the spindle speed increases,the open circuit potential of the joint increases,and the corrosion current densityincreases.This means an increase in spindle speed will lead to a decrease in the corrosion tendency of the joint and anincrease in corrosion rate,resulting in a decrease in the corrosion resistance of the joint.