LC4铝合金的应力腐蚀研究

中国腐蚀与防护学报

1992, Vol. 12

Issue (2): 131-136

研究报告

本期目录 | 过刊浏览

LC4铝合金的应力腐蚀研究

乔利杰;王勇;褚武扬;肖纪美

北京科技大学;北京科技大学;北京科技大学;北京科技大学

AN INVESTIGATION ON STRESS CORRoSION OF ALUMINUM ALLOY LC4

Qiao Lijie; Wang Yong; Chu Wuyang and Xiao Jimei (Beijing University of Science and Teclmology)

全文: PDF(924 KB)

摘要: 用Ⅱ型试样以慢拉伸方法研究了拉伸速度和极化电位对LC4铝合金应力腐蚀开裂行为的影响。采用应力腐蚀开裂面积A_(SCC)、应力腐蚀最大抗拉强度σ_(SCC)及其所对应的应变ε_(SCC)作为衡量应力腐蚀开裂敏感性的参数。结果表明,随拉伸速度降低,应力腐蚀开裂敏感性升高,但用σ_(SCC)来表现应力腐蚀开裂的敏感性不如A_(SCC)明显。阳极极化使抗拉强度下降;阴极极化时。若极化电位较小,则抗拉强度略有升高,强阴极极化抗拉强度则又会降低,说明应力腐蚀包含氢脆和阳极溶解两种机制。断口形貌观察发现,开路、阴极极化和充氢时的断口形貌相同,阳极极化则与其不同,表明开路时的应力腐蚀开裂是以氢脆为主的。

Abstract：The effects of strain rate and polarization potential on the sensitivity of SCC of aluminium alloy LC4 were investigated with slow strain rate tensile tests. The fracture area through SCC(A_(SCC)), the maximum tensile strength under SCC(σ_(SCC)) and the corresponding elongation (ε_(SCC)) were used as parameters for evaluating the sensitivity of SCC. The results indicated that the sensitivity of SCC increased with the decrease of strain rate, and A_(SCC) was more sensitive than σ_(SCC). Anodic polarization reduced A_(SCC); weak cathodic polarization increased σ_(SCC) slightly, and strong cathodic polarization decreased σ_(SCC). It showed that both mechanisms of hydrogen embrittlement and anodic dissolution were operative in this system. The fractographs were similar for the specimens fractured under the conditions of open circuit, cathodic polarization or after hydrogen charging, but quite different for those under anodie polarization. It showed that hydrogen embrittlement played a predominant role for this system under the comdition of open circuit.

收稿日期: 1992-04-25

基金资助:国家自然科学基金

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引用本文:

乔利杰;王勇;褚武扬;肖纪美. LC4铝合金的应力腐蚀研究[J]. 中国腐蚀与防护学报, 1992, 12(2): 131-136.
. AN INVESTIGATION ON STRESS CORRoSION OF ALUMINUM ALLOY LC4. J Chin Soc Corr Pro, 1992, 12(2): 131-136.

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1992/V12/I2/131

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[4] Speidel, M. O., Hydrogen in Metals, Bernstein, I. M. and Thompson, A. W. Eds., ASM, 1974, P. 249
[5] 乔利杰,褚武扬,陆建栋,肖纪美.中国腐蚀与防护学报,6,273(1986)

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