2002•Zhongguo fushi yu fanghu xuebaoRequires access
EFFECT OF HYDROGEN ON STRESS CORROSION CRACKING OF LC4 ALUMINUM ALLOY
Zhang Pei-fen
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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 studied using slow strain rate tension technique.The experimental results showed that 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 the condition of anodic polarization in 3.5% NaCl solution,the mechanism of SCC is mainly anodic dissolution.Under the condition of hydrogen pre-permeation or cathodic polarization,hydrogen embrittlement plays a key role during the SCC process.The results also indicated that the SCC resistance of LC4 alloy decreases with increasing the time of hydrogen pre-permeation.