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水浸搅拌摩擦焊铝/镁接头腐蚀行为研究 |
黄体方1,王艺霏1,陈思浩2,李峻臣2,万 龙1,3,孟祥晨1,3,谢聿铭1,3,黄永宪1,3
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1. 先进焊接与连接国家重点实验室,哈尔滨工业大学,哈尔滨 150001;2. 上海航天精密机械研究所,
上海 201600;3. 郑州研究院,哈尔滨工业大学,郑州 450046
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摘要: |
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。 |
关键词: 铝/镁;水浸搅拌摩擦焊;电化学腐蚀;开路电位;腐蚀电流密度 |
基金项目:国家自然科学基金项目(521**301、522**350) |
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Corrosion Behavior of Submerged Friction Stir Welded AZ31B Magnesium Alloy and 6061 Aluminum Alloy Dissimilar Joints |
Huang Tifang1, Wang Yifei1, Chen Sihao2, Li Junchen2, Wan Long1,3, Meng Xiangchen1,3, Xie Yuming1,3, Huang Yongxian1,3
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1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001;2. Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600;3. Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450046
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Abstract: |
The electrochemical corrosion behavior of submerged friction stir welded aluminum/magnesium dissimilar joints was studied. The results showed that within the rotational speed of 700r/min to 1000r/min, there were no obvious 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 density increases. This means an increase in spindle speed will lead to a decrease in the corrosion tendency of the joint and an increase in corrosion rate, resulting in a decrease in the corrosion resistance of the joint. |
Key words: Al/Mg;submerged friction stir welding;electrochemical corrosion;open circuit potential;corrosion current density |