期刊论文

Li, W.-B.(Li_wenbin2006@eyou.com)

中文

航空材料学报

1005-5053

2008

28

1

53-58

10.3969/j.issn.1005-5053.2008.01.012

2006AA03Z523:国家高技术研究发展计划（863计划）

本校为其他机构

研究了含钪Al-Zn-Cu-Mg-Zr合金的晶间腐蚀和剥落腐蚀行为.结果表明:合金在过时效状态下具有最低的晶间腐蚀与剥落腐蚀敏感性;随着时效时间的延长,其晶间腐蚀与剥落腐蚀敏感性逐渐降低;在EXCO溶液中进行的极化曲线测试也表现出相同的趋势.合金发生晶间腐蚀与η'和S'相的析出与分布紧密相关.随着时效时间的延长,η'和S'相不断析出并向平衡相η和S转变,进一步聚集长大,一方面减少了晶间腐蚀的阳极通道,另一方面减小了沉淀相与基体之间的开路电位,从而使晶间腐蚀和剥落腐蚀的速率降到最低.

Intergranular and exfoliation corrosion behaviors of Al-Zn-Cu-Mg-Zr alloy containing Sc were investigated. This over-aged alloy has the lowest intergranular and exfoliation corrosion sensitivity which decreased with the aging time and accorded with the results of polarization tests in EXCO solution, intergranular and exfoliation corrosion are closely attributed to η′, S′ and their distributions. With the aging time prolonging, η′ and S′ phases precipitated and transformed into equilibrium η′ and S′ phases. The coarsed η′ and S′ phas...