| Relativity between corrosion—induced stress and stress corrosion cracking of brass in an ammonia solution |
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| 作者单位： | Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
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| 摘 要： | The susceptibility to stress corrosion cracking (SCC) of brass in an ammonia solution with various pH values or under various applied potentials was measured at slow strain rate tests. The additive stress in the same solution was measured using two methods. The results indicate that the variation of the susceptibility to SCC with pH value or with potential is in an excellent agreement with the corrosion (passive film or dezincification layer)-induced stress. When pH≥7, the corrosion-induced tensile stress andthe susceptibility to SCC have maximum values and hardly change with increasing the pH value. However, when pH < 7, both the corrosion-induced tensile stress and the susceptibility to SCC reduce rapidly with decreasing the pH value. Both the corrosion-induced tensile stress and the susceptibility to SCC have maximum values at the open-circuit potential, decrease slightly under the anodic polarization, and reduce gradually to zero under the cathodic polarization.
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| 关 键 词： | 应力腐蚀 黄铜 氨溶液 |
Relativity between corrosion-induced stress and stress corrosion cracking of brass in an ammonia solution |
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| Xianzhong Guo,Wuyang Chu,Kewei Gao,Lijie Qiao. Relativity between corrosion-induced stress and stress corrosion cracking of brass in an ammonia solution[J]. Journal of University of Science and Technology Beijing, 2002, 9(6): 431-436 |
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| Authors: | Xianzhong Guo Wuyang Chu Kewei Gao Lijie Qiao |
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| Affiliation: | Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The susceptibility to stress corrosion cracking (SCC) of brass in an ammonia solution with various pH values or under various applied potentials was measured at slow strain rate tests. The additive stress in the same solution was measured using two methods. The results indicate that the variation of the susceptibility to SCC with pH value or with potential is in an excellent agreement with the corrosion (passive film or dezincification layer)-induced stress. When pH ? 7, the corrosion-induced tensile stress and the susceptibility to SCC have maximum values and hardly change with increasing the pH value. However, when pH < 7, both the corrosion-induced tensile stress and the susceptibility to SCC reduce rapidly with decreasing the pH value. Both the corrosion-induced tensile stress and the susceptibility to SCC have maximum values at the open-circuit potential, decrease slightly under the anodic polarization, and reduce gradually to zero under the cathodic polarization. |
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| Keywords: | brass stress corrosion cracking pH corrosion-induced stress |
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