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EFFECT OF HYDROGEN ON STRESS CORROSIONCRACKING OF LC4 ALUMINUM ALLOY |
Jihua Liu;Di Li;Peifen Zhang |
北京航空航天大学材料科学与工程系 |
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Abstract The effect of hydrogen on stress corrosion cracking (SCC) of the high-strength LC4 aluminum alloy in 3.5%NaCl solution has been stu died using slow strain rate tension technique.The experimental results showed th at the alloy is susceptible to SCC in humid air,especially in NaCl solution.SCC may occur in the mechanisms of anodic dissolution and hydrogen embrittlement,but the mechanisms would be varied under various conditions.In humid air,or under t he condition of anodic polarization in 3.5% NaCl solution,the mechanism of SCC i s mainly anodic dissolution.Under the condition of hydrogen pre-permeation or ca thodic polarization,hydrogen embrittlement plays a key role during the SCC proce ss.The results also indicated that the SCC resistance of LC4 alloy decreases wit h increasing the time of hydrogen pre-permeation.
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Received: 17 November 2000
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Corresponding Authors:
Jihua Liu
E-mail: jhliu@sues.cn
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