盐水环境下2A12铝合金搅拌摩擦焊缝腐蚀速率

王磊; 李平赟; 回丽; 姬书得; 张占昌

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盐水环境下2A12铝合金搅拌摩擦焊缝腐蚀速率
王磊^1,2, 李平赟¹, 回丽^1,2, 姬书得^2,3, 张占昌¹
1.沈阳航空航天大学机电工程学院, 沈阳 110136;2.沈阳航空航天大学航空制造工艺数字化国防重点学科实验室, 沈阳 110136;3.沈阳航空航天大学航空航天工程学部, 沈阳 110136

摘要:

采用静态失重法测量了2A12铝合金搅拌摩擦焊缝在3.5% NaCl水溶液中的平均腐蚀速率,结合焊缝腐蚀机理、腐蚀产物成分与腐蚀损伤宏-微观形貌分析了不同腐蚀时间下搅拌摩擦焊缝腐蚀速率的变化规律. 结果表明,焊缝平均腐蚀速率经历了从大幅下降到缓慢回升的过程,这与焊缝的腐蚀经历了由点蚀到沿晶腐蚀,最后发展为剥蚀的腐蚀机理变化密切相关;试件质量去除率表明腐蚀时间越长,焊缝腐蚀越严重;焊缝不同区域腐蚀敏感性不同,焊核区腐蚀严重,前进侧次之,返回侧腐蚀相对较轻.

关键词: 搅拌摩擦焊腐蚀速率腐蚀机理二次相

DOI：

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基金项目:国家自然科学基金资助项目(51405309,51204111);辽宁省教育厅高等学校科学研究资助项目(L2014065)

Corrosion rate of 2A12 aluminum alloy friction stir weld under salt solution

WANG Lei^1,2, LI Pingyun¹, HUI Li^1,2, JI Shude^2,3, ZHANG Zhanchang¹

1.Department of Mechanical and Electrical Engineering, Shenyang Aerospace University, Shenyang 110136, China;2.Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang 110136, China;3.Department of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China

Abstract:

Static weight loss method was utilized to measure the average corrosion rate of friction stir weld 2A12 aluminum alloy joint under 3.5% NaCl solution. The variation of corrosion rates under different corrosion time was studied based on the analysis of corrosion mechanism, corrosion product composition and morphology of corrosion damages. Results showed that the average corrosion rate decreased dramatically at the beginning and then rose slowly which was closely related to the change of corrosion mechanism from pitting to intergranular corrosion, which finally became to exfoliation corrosion. The weld was corroded more seriously under longer corrosion time according to the quality removal ratio. Different zones of the weld have different corrosion sensibility, namely, the weld nugget has most serious corrosion, followed by the front side and the retreating side was corroded slightly.

Key words: friction stir welding corrosion rate corrosion mechanism secondary phase