Effect of the Tensile Stress and Galvanic Factors on the Corrosion Behavior of 2E12 Aluminum Alloy
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摘要: 为探讨应力和电偶双重因素对2E12-T3铝合金腐蚀行为的影响,采用应力腐蚀试验,电偶腐蚀试验以及电化学阻抗技术、金相技术、扫描电镜分析技术,研究了应力和电偶双重因素对铝合金腐蚀行为的作用机理。研究结果表明:2E12-T3在NaCl-H2O2溶液中具有很高的应力腐蚀敏感性。未偶接不锈钢时,随着所受外加拉应力水平的提高,铝合金表面阻抗略有降低,合金抗腐蚀能力下降,外加拉应力提高了铝合金的腐蚀敏感程度。偶接不锈钢后,同应力条件下的阻抗值较偶接前低很多,并且相同应力水平下的断裂时间缩短为未偶接时的1/3,电偶因素起到了很大的作用。在应力因素和电偶因素的共同作用下,铝合金腐蚀敏感性非常高。Abstract: In order to study the effect of the stress and galvanic factors on the corrosion behavior of 2E12-T3 alumi-num alloy, the stress corrosion experiment, galvanic corrosion experiment, electrochemical impedance techniques, metallography techniques and scanning electron microscope (SEM) were used to study the mechanism. The results show that: in NaCl-H2 O2 solution, the corrosion resistance of 2E12-T3 is low and the aluminum alloy has high stress corrosion sensitivity. When the aluminum alloy is not coupled to stainless steel, with increase of the tensile stress, the surface impedance of aluminum alloy is slightly reduced, and the resistance to corrosion fell. The tensile stress increases the corrosion degree of aluminum alloy. When coupled to stainless steel, at the same stress condi-tions, the impedance of the aluminum alloy is lower than that not coupled to stainless steel. After coupled to stain-less steel, the aluminum alloy's fracture time is shorten 1/3. The galvanic factors play a significant role. Under the condition of stress and galvanic, the corrosion sensitivity of aluminum alloy is very high.
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Key words:
- corrosion /
- electrochemical impedance spectroscopy /
- metallography /
- stainless steel
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[1] 葛荣山，张永安，李志辉等．2E12 和 2524 铝合金微观组织与疲 劳裂纹扩展速率研究[J]. 稀有金属，2011，35(4):600～606 [2] 杨胜，易丹青，姚素娟等．热处理对 2E12 铝合金耐腐蚀性及 力学性能的影响[J]．金属热处理，2007，32(9):9～13 [3] R obinson M J，Jackson N C．The influence of grain structure and intergranular corrosion rate on exfoliation and stress corrosion cracking of high strength Al-Cu-Mg alloys[J]．Corrosion Sci-ence，1998，41:10～13 [4] 刘道新．材料的腐蚀与防护[M]. 西安:西北工业大学出版 社，2006:137～144 [5] 饶思贤，张玉波，朱立群等．外加应力下的 LY12CZ 电化学行 为[J]．北京航空航大学学报，2007，33(10):1246～1250 [6] Liu X D，Frankel G S，Zoofan B，et al．Effect of applied tensile stress on intergranular corrosion of AA20242T3[J]．Corrosion Science，2004，46(2):405～425 [7] Liu X D，Frankel G S．Effects of compressive stress on localized corrosion in AA20242T3[J]. Corrosion Science，2006，48 (10):3309～3329 [8] 邓斌，易丹青，杨胜等．2E12 铝合金加速腐蚀环境谱下的疲劳 裂纹扩展[J]. 材料科学与工程学报，2009，27(5):770～773 [9] 纪朝辉，张璋，苏景新，王志平．局部拉弯应力对民机蒙皮 2024-T3 铝合金剥蚀行为的影响[J]. 航空学报，2012 [10] Srivatsan T S，Kolar D，Mag nusen P．Influence of temperature on cyclic stress response，strain resistance，and fracture behavior of aluminumalloy2524[J]．Materials Science and Engineering (A)，2001，314(1/2):118～130 [11] 曹楚南，张鉴清．电化学阻抗谱导论[M]. 北京:科学出版 社，2002 [12] Liu Y B，Liu Z Y，Li Y T，Xia Q K，Zhou J．Enhanced fatigue crack propagation resistance of an Al-Cu-Mg alloy by artificial ag-ing[J]．Materials Science and Engineering A，2008，492(1/ 2):333～336 [13] Hargarter H，Lyttle M T，Starke E A．Effects of preferentially aligned precipitates on plastic anisotropy in Al-Cu-Mg-Ag and Al-Cu alloys[J]．Materials Science and Engineering A，1998，257(1):87～99 [14] Oliviera M G，Poelmanb M，Demuyncka M，Petitjeana J P．EIS evaluation of the filiform corrosion of aluminium coated by a cata-phoretic paint[J]．Progress in Organic Coatings，2005，52: 263～270 [15] Viejo F，Coy A E，Garcia-Garcia F J，et al．R elationship be-tween microstructure and corrosion performance of AA2050-T8 aluminium alloy after excimer laser surface melting[J]. Corro-sion Science，2010，52:2179～2187 -
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