盐水酸碱度对6082铝合金搅拌摩擦焊缝应力腐蚀开裂的影响
Influence of Salt Solution pH Level on SCC Characteristics of 6082 Aluminum Alloy Joint Made by Friction Stir Welding
摘 要
采用慢应变速率试验（SSRT）、扫描电镜、光学显微镜和能谱分析等手段，研究并比较了6082铝合金搅拌摩擦焊（FSW）焊缝在空气和pH分别为6，7，8的3.5% NaCl溶液中的应力腐蚀开裂（SCC）性能，讨论了该合金焊缝在不同盐水介质中产生应力腐蚀开裂差异的原因。结果表明：FSW焊缝在偏酸、偏碱及中性NaCl溶液中的SCC敏感性指数ISSRT依次为0.13，0.074，0.055；在中性盐水和弱碱性盐水中，焊缝主要是韧性断裂，SCC特征不明显，在弱酸性盐水中的断口呈混合型断裂的某些SCC特征。
搅拌摩擦焊缝
应力腐蚀开裂
盐水酸碱度
慢应变速率试验
6082 aluminum alloy
friction stir welding (FSW)
stress corrosion cracking (SCC)
salt solution pH level
slow stress rate testing (SSRT)
Abstract
The SCC characteristics of 6082 aluminum alloy joints made by friction stir welding (FSW) in air, 3.5% NaCI solution (pH=7, 8, 9 respectively) were studied and comparaed by means of slow strain rate testing (SSRT), SEM, OM and EDS. The causes of the difference of SCC characteristics in different media were discussed. The results show that the SCC sensitivity index ISSRT of the FSW welds in acid, alkaline and neutral NaCl solutions were 0.13, 0.074 and 0.055 respectively. The weld fracture exhibited mainly ductile fracture without SCC characteristics in neutral and weakly alkaline solutions, and mixed fracture with some SCC characteristics in weakly aid solution.
中图分类号 TG172 DOI 10.11973/fsyfh-201703009
所属栏目 试验研究
基金项目
收稿日期 2015/7/16
修改稿日期
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引用该论文: LIN Dian-hai,YUAN Ge-cheng,GUO Hai-bin,QIN Dian-cheng,DING Can-pei. Influence of Salt Solution pH Level on SCC Characteristics of 6082 Aluminum Alloy Joint Made by Friction Stir Welding[J]. Corrosion & Protection, 2017, 38(3): 199
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参考文献
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【4】张华,孙大同,张贺,等. 铝合金搅拌摩擦焊接接头腐蚀行为研究进展[J]. 中国腐蚀与防护学报,2013,33(3):175-181.
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【6】沈海军,郭万林,吕国志. NaCl溶液中LC9铝合金应力腐蚀特性的试验研究[J]. 腐蚀与防护,2002,23(5):190-192.
【7】沈长斌,王忠志,权高峰,等. 6082铝合金搅拌摩擦焊接头组织及腐蚀性能研究[J]. 腐蚀科学与防护技术,2010,22(5):400-402.
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【9】EL-DANAF E A,EL-RAYES M M. Microstructure and mechanical properties of friction stir welded 6082 AA in as welded and post weld heat treated conditions[J]. Materials & Design,2013,46:561-572.
【10】刘万雷,常新龙,张有宏,等. 铝合金应力腐蚀机理及研究方法[J]. 腐蚀科学与防护技术,2013,25(1):71-73.
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【14】宋仁国,张宝金,曾梅光. 7175铝合金的应力腐蚀及晶界Mg偏析的作用[J]. 金属学报,1997,33(6):595-601.
【15】GAO J,QUESNEL D J. Enhancement of the stress corrosion sensitivity of AA5083 by heat treatment[J]. Metall and Mat Trans A,2010,42(2):356-364.
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