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| 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) |
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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.
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Received: 25 February 1995
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Cite this article:
Xu Chunchun; Jin Zhiqiang; Zuo Jingyi(Beijing Institute of Chemical Technology). 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.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1995/V15/I1/49
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| 1SpeidelMO．ThetheoryofStressCorrosionCrackinginAlloys,ed．SoullyJ．C;NATO,1971．P．289~3442左景伊．应力腐蚀破裂,西安:西安交通大学出版社,1985．p．36~403SpeldelMO．HydrogeninMetals,BernsteinIM,ThompsonAW．Eds,ASM1974．p．2494吴涤凡,潘辉英,方玉琴．中国腐蚀与防护学报,1981,1(3):73 |
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