pH值对7050铝合金膜致应力和应力腐蚀敏感性的影响

doi:10.11868/j.issn.1001-4381.2016.05.014

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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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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 words： 7050 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

基金资助:国家自然科学基金资助项目(51371039)

通讯作者: 宋仁国 E-mail: songrg@hotmail.com

作者简介: 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

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.
Xing QI, Ren-guo SONG, Wen-juan QI, Ji-rong JIN, Chao WANG, Hai LI. 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

Fig.1 7050铝合金试样在不同pH值的3.5%NaCl溶液中浸泡6h后的钝化膜形貌 (a)pH=1；(b)pH=2；(c)pH=7；(d)pH=9；(e)pH=13；(f)pH=14

Table 1 7050铝合金在不同pH值的3.5%NaCl溶液中浸泡6h后的应力腐蚀敏感性

Fig.2 7050铝合金应力腐蚀敏感性随pH值的变化

Table 2 不同pH值下7050铝合金的腐蚀过程中产生的膜致应力

Fig.3 同一试样形成钝化膜前后的应力-应变曲线 (a)pH=2,σ_P=90MPa;(b)pH=7,σ_P=46MPa;(c)pH=9,σ_P=54MPa;(d)pH=13,σ_P=112MPa

Fig.4 不同pH值的膜致应力与应力腐蚀敏感性

Fig.5 不同pH值时7050铝合金的Nyquist图

Fig.6 不同pH值时7050铝合金的Bode图

Fig.7 7050铝合金试样在3.5%NaCl溶液中的等效电路

Table 3 等效电路中各组元的电化学阻抗参数

Fig.8 7050铝合金的XPS分析图 (a)Al2p;(b)O1s

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