金骥戎,宋仁国,代春丽,王超,李海,祁星,祁文娟

• 1:常州大学材料科学与工程学院
• 2:江苏省材料表面科学与技术重点实验室
• 3:中国科学院金属研究所

摘要(Abstract)：

采用双悬臂梁(DCB)试样,并通过阴极极化、扫描电镜(SEM)、透射电镜(TEM)和飞行时间二次离子质谱(ToF-SIMS)分析等手段,研究了不同时效状态下7050铝合金在3.5%Na Cl水溶液中的应力腐蚀行为。结果表明:7050铝合金时效后的应力腐蚀敏感性(Iscc)变化规律为:Iscc欠时效(135℃×8 h)﹥Iscc峰时效(135℃×16 h)﹥Iscc过时效(135℃×24 h)。阴极极化电位E=-1100 m V时,合金的Iscc增加,DCB试样裂尖处氢离子流强度变大,氢在晶内扩散程度加深。微观组织分析表明:随着时效时间的延长,7050铝合金晶界析出相明显粗化,并且呈不连续分布。

关键词(KeyWords)： 7050铝合金;时效;阴极极化;应力腐蚀

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51371039)

作者(Author): 金骥戎,宋仁国,代春丽,王超,李海,祁星,祁文娟

DOI: 10.13289/j.issn.1009-6264.2015.03.017

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