LC4铝合金在NaCl水溶液中应力腐蚀临界破裂电位及裂尖状态的研究

中国腐蚀与防护学报

1995, Vol. 15

Issue (1): 49-53

研究报告

本期目录 | 过刊浏览

LC4铝合金在NaCl水溶液中应力腐蚀临界破裂电位及裂尖状态的研究

许淳淳;金志强;左景伊

北京化工学院

AN INVESTIGATION OF CRITICAL SCC POTENTIAL AND CHEMICAL STATES WITHIN CRACKS FOR ALUMINIUM ALLOY LC4 IN NaCl SOLUTIONS

Xu Chunchun; Jin Zhiqiang; Zuo Jingyi(Beijing Institute of Chemical Technology)

全文: PDF(882 KB)

摘要: 采用控制电位下的恒载荷拉伸试验测得ＬＣ４铝合金在３０℃、５０℃、９０℃的０．５ｍｏｌ／ＬＮａＣｌ水溶液（ｐＨ＝７）中的应力腐蚀临界破裂电位Ｅｃｒｉ分别为－７２０ｍＶ、－７６０ｍＶ、－８５０ｍＶ（ＳＣＥ）．体系电位负于Ｅｃｒｉ时不发生应力腐蚀破裂．Ｅｃｒｉ随介质温度Ｔ升高而向负方向移动，Ｅｃｒｉ与Ｔ大体呈直线关系：Ｅｃｒｉ＝－Ａ１５５－２．１７Ｔ（ｍＶ）．用改进的模拟闭塞电池研究了裂纹尖端化学状态的变化：当通入闭塞区的阳极电流密度为１ｍＡ／ｃｍ２时，其溶液ｐＨ值从７降至３．３，Ｃｌ－浓集倍数高达４．断口呈典型的沿晶应力腐蚀开裂形貌．

Abstract：Constant load and potentiostatic techniques were used to study the critical SCC potential of aluminium alloy LC4 in 0.5mol/L NaCl solution. It was found that the critical potentials for this system at 30℃, 50℃, 90℃ are -720mV, -760mV, -850mV (SCE), respectively, below which the SCC will not occur. The dependence of the critical potential upon temperature follows a linear equation: Ecri=-655-2.17t (mV). The simulated occluded corrosion cell was modified and used to investigate chemical changes within stress corrosion cracks. When an anodic currellt of 1mV/cm2 was passed through, the pH value of the occluded cell solution dropped down from 7 to 3.3 and the faCtor of Cl- enrichmeat in the solution could be up to 4. Scanning electron fractographs of SCC of alloy LC4 showed a typical intergranular cracking feature.

收稿日期: 1995-02-25

基金资助:国家自然科学基金

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引用本文:

许淳淳;金志强;左景伊. LC4铝合金在NaCl水溶液中应力腐蚀临界破裂电位及裂尖状态的研究[J]. 中国腐蚀与防护学报, 1995, 15(1): 49-53.
. AN INVESTIGATION OF CRITICAL SCC POTENTIAL AND CHEMICAL STATES WITHIN CRACKS FOR ALUMINIUM ALLOY LC4 IN NaCl SOLUTIONS. J Chin Soc Corr Pro, 1995, 15(1): 49-53.

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1995/V15/I1/49

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