EFFECT OF HYDROGEN ON STRESS CORROSIONCRACKING OF LC4 ALUMINUM ALLOY

J Chin Soc Corr Pro

2002, Vol. 22

Issue (5): 308-310 DOI:

Research Report

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EFFECT OF HYDROGEN ON STRESS CORROSIONCRACKING 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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Jihua Liu; Di Li; Peifen Zhang. EFFECT OF HYDROGEN ON STRESS CORROSIONCRACKING OF LC4 ALUMINUM ALLOY. J Chin Soc Corr Pro, 2002, 22(5): 308-310 .

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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.

Key words: high-strength aluminum alloys stress corrosion crackin g slow strain rate tension hydrogen embrittle

Received: 17 November 2000

ZTFLH:

TG172.9

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I5/308

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