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材料工程  2016, Vol. 44 Issue (5): 86-92    DOI: 10.11868/j.issn.1001-4381.2016.05.014
  测试与表征 本期目录 | 过刊浏览 | 高级检索 |
pH值对7050铝合金膜致应力和应力腐蚀敏感性的影响
祁星1,2, 宋仁国1,2, 祁文娟1,2, 金骥戎1,2, 王超1,2, 李海1
1. 常州大学 材料科学与工程学院, 江苏 常州 213164;
2. 常州大学 江苏省材料表面科学与技术重点实验室, 江苏 常州 213164
Influence of pH Values on Passive Film-induced Stress and Susceptibility to Stress Corrosion Cracking in 7050 Aluminum Alloy
QI Xing1,2, SONG Ren-guo1,2, QI Wen-juan1,2, JIN Ji-rong1,2, WANG Chao1,2, LI Hai1
1. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China;
2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, Jiangsu, China
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摘要 采用慢应变速率拉伸法和流变应力差值法研究了7050铝合金在3.5%(质量分数)NaCl水溶液中膜致应力和应力腐蚀敏感性随pH值的变化规律。结果表明:当pH≤7时,随着pH值的增大,膜致应力和应力腐蚀敏感性均下降,当pH>7时,膜致应力和应力腐蚀敏感性随着pH值的增大而提高;而当pH=1,14时,腐蚀的类型为剥蚀,合金基体发生剥落,表面没有钝化膜产生。pH值在6~9之间时,膜致应力随pH的变化比较平缓,而pH在2~5和10~13之间时,膜致应力变化则较为剧烈,整体的变化曲线呈山谷形。膜致应力和应力腐蚀敏感性具有很强的相关性。XPS研究表明,膜致应力值与钝化膜的成分有关。
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祁星
宋仁国
祁文娟
金骥戎
王超
李海
关键词 7050铝合金应力腐蚀敏感性pH值膜致应力    
Abstract:The change tendency of passive film-induced stress and susceptibility to stress corrosion cracking (SCC) with various pH values of 7050 aluminum alloy in 3.5% (mass fraction) NaCl solution was investigated by slow strain rate testing (SSRT) and flowing stress differential method. The results show that when pH≤7, with the increase of pH value, the passive film-induced stress and the susceptibility to SCC decrease, correspondingly; when pH>7, they increase with the increase of pH value. However, when pH=1,14, the corrosion type is exfoliation corrosion, the alloy matrix exfoliated, there is no film formed on the specimens surface. Moreover, the variation of passive film-induced stress is changed slowly when the pH value is between 6 and 9, nevertheless, it is much more severe when the pH value is between 2 and 5 as well as between 10 and 13. The whole variation plot is presented as valley shape and the passive film-induced stress and susceptibility to SCC is of a close relationship. The film-induced stress is related to the compositions of the passive film by X-ray photoelectron spectrum (XPS).
Key words7050 aluminum alloy    susceptibility to SCC    pH value    passive film-induced stress
收稿日期: 2014-09-04      出版日期: 2016-05-19
中图分类号:  TG178  
通讯作者: 宋仁国(1965-),博士,教授,博士生导师,主要研究方向为材料腐蚀与防护、表面工程、计算材料科学等,联系地址:江苏省常州市武进区滆湖路常州大学材料学院(213164),E-mail:songrg@hotmail.com     E-mail: songrg@hotmail.com
引用本文:   
祁星, 宋仁国, 祁文娟, 金骥戎, 王超, 李海. pH值对7050铝合金膜致应力和应力腐蚀敏感性的影响[J]. 材料工程, 2016, 44(5): 86-92.
QI Xing, SONG Ren-guo, QI Wen-juan, JIN Ji-rong, WANG Chao, LI Hai. Influence of pH Values on Passive Film-induced Stress and Susceptibility to Stress Corrosion Cracking in 7050 Aluminum Alloy. Journal of Materials Engineering, 2016, 44(5): 86-92.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.05.014      或      http://jme.biam.ac.cn/CN/Y2016/V44/I5/86
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