材料工程2018，Vol.46Issue(4)：74-81,8.DOI:10.11868/j.issn.1001-4381.2016.000655
7A04铝合金应力腐蚀敏感性及裂纹萌生与扩展行为
Susceptibility to Stress Corrosion and Crack Initiation and Propagation of 7A04 Aluminum Alloys
摘要
Abstract
The crack initiation and propagation of 7A04 aluminum alloy in 3. 5％NaCl solution at pH= 1, 4, 7, 12 during slow strain rate test (SSRT) were investigated by the method of combining phase shift with electrochemical impedance spectroscopy. The feasibility of the method was verified by electrochemical noise (EN). The results show that the more corrosive the solution is, the susceptibility of the 7A04 aluminum alloy to stress corrosion cracking is greater; in the solution at pH = 1, the phase shift method shows that crack initiates at 1h and propagates at 4. 5h, and the electrochemical impedance spectroscopy in situ method shows the crack initiation and propagation are discontinuous, and in stages;the EN results show that the crack initiation occurs at a certain moment among 3000-5000s and propagates obviously at a certain moment among 13500-22500s accompanying with obvious periodical current and potential noise peaks.关键词
铝合金/应力腐蚀开裂/电化学阻抗谱/电化学噪声Key words
aluminum alloy/stress corrosion cracking/electrochemical impedance spectroscopy/electrochemical noise分类
矿业与冶金引用本文复制引用
杜娟,田辉,陈亚军,王付胜,陈翘楚,褚弘..7A04铝合金应力腐蚀敏感性及裂纹萌生与扩展行为[J].材料工程,2018,46(4):74-81,8.基金项目
国家自然科学基金青年基金项目 (11502285) （11502285）
中国民航大学科研启动基金 (2012QD2x) （2012QD2x）
