7A52铝合金的应力腐蚀性能影响

腐蚀科学与防护技术, 2009, 21(2): 119-121.

7A52铝合金的应力腐蚀性能影响

闫永贵马力曾红杰张海兵

1.1海洋腐蚀与防护国防科技重点实验室

青岛 266071；

青岛 266071；

3.3沈阳工业大学

沈阳 110178>

Qingdao 266071

2Luoyang Ship Material Research Institute

Qingdao 266071

3.3Shenyang University of Technology

Shenyang 110178>

关键词： 7A52铝合金应 , stress cracking corrosion , cathodic polarization , metal inert gas welding , friction stir welding

STRESS CRACKING CORROSSION OF 7A52 ALUMINUM ALLOY

YAN Yong-gui

Keywords： 7A52 aluminum alloy , 力腐蚀 , 阴极极化 , 熔焊 , 摩擦搅拌焊

采用慢应变拉伸试验技术研究了阴极极化电位和焊接工艺对7A52铝合金应力腐蚀性能的影响，并利用体视显微镜和扫描电镜分析了断口形貌.结果表明：外加阴极极化使7A52铝合金的应力腐蚀指数增大，应力腐蚀敏感性呈增大趋势；摩擦搅拌焊件应力腐蚀性能优于熔焊件.

The effect of cathodic polarization and welding procedure on stress cracking corrosion of 7A52 aluminum alloy was investigated by slow strain rate test.Fracture morphology was observed by stereomicroscope and SEM.The results showed that the stress cracking corrosion index of 7A52 aluminum alloy increases with cathodic polarization,thereby susceptibility to stress cracking corrosion increases.The stress cracking corrosion performance of the specimen prepared by friction stir welding is better than by metal inert gas welding.

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