7B04铝合金和30CrMnSiA钢短期腐蚀的电化学行为研究
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摘要
目的研究7B04铝合金和30CrMnSiA合金钢试样的电化学性能。方法采用电化学实验、扫描电子显微镜(SEM)、腐蚀坑深度测试分别对7B04铝合金和30CrMnSiA合金钢试样在是否经过天然海水浸泡的情况下进行测试分析,得到微观腐蚀形貌和腐蚀坑深度以及试样表面不带锈和带锈时的电化学性能。结果随着Na Cl浓度增大,7B04铝合金和30CrMnSiA钢的自腐蚀电流变大,两者之间存在明显的电位差,接触后会发生电偶腐蚀。电偶电流与阴阳极面积比和Na Cl浓度有关,阴阳极面积比增大或Na Cl浓度升高均会导致电偶效应增强。经过海水短期浸泡后,7B04铝合金表面的锈层不仅没有起到抑制腐蚀的作用,反而使自腐蚀加重,但电偶效应确实有所减弱。结论沿海设备在使用过程中应竭力避免铝合金在锈层下工作。
Objective To study electrochemical performance of 7B04 Aluminum alloy and 30CrMnSiA alloy steel samples.Methods The electrochemical test,scanning electron microscopy(SEM),corrosion pit depth test were adopted to analyze and test whether 7B04 Aluminum alloy and 30CrMnSiA alloy steel samples were immersed in natural seawater or not,to obtain micro-morphology and corrosion pit depth and electrochemical performance with or without rust on the surface.Results The self-corrosion current of 7B04 aluminum alloy and 30CrMnSiA steel increased with the increase of Na Cl concentration.Because of obvious potential difference between them,galvanic corrosion occurred after contacting.The galvanic current was related to the ratio of the cathode to anode area and the concentration of Na Cl.Increase of the cathode to anode area ratio or Na Cl concentration would lead to intensifying of galvanic effect.After short immersion in seawater,the rust layer on the surface of 7B04 aluminum alloy did not inhibit the corrosion,but increased the self–corrosion.However,the galvanic effect was weakened in deed.Conclusion Coastal equipment in use process should be avoided to work under the aluminum alloy in the rust layer
Objective To study electrochemical performance of 7B04 Aluminum alloy and 30CrMnSiA alloy steel samples.Methods The electrochemical test,scanning electron microscopy(SEM),corrosion pit depth test were adopted to analyze and test whether 7B04 Aluminum alloy and 30CrMnSiA alloy steel samples were immersed in natural seawater or not,to obtain micro-morphology and corrosion pit depth and electrochemical performance with or without rust on the surface.Results The self-corrosion current of 7B04 aluminum alloy and 30CrMnSiA steel increased with the increase of Na Cl concentration.Because of obvious potential difference between them,galvanic corrosion occurred after contacting.The galvanic current was related to the ratio of the cathode to anode area and the concentration of Na Cl.Increase of the cathode to anode area ratio or Na Cl concentration would lead to intensifying of galvanic effect.After short immersion in seawater,the rust layer on the surface of 7B04 aluminum alloy did not inhibit the corrosion,but increased the self–corrosion.However,the galvanic effect was weakened in deed.Conclusion Coastal equipment in use process should be avoided to work under the aluminum alloy in the rust layer
引文
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[13]刘宇,石勇,李宁,等.5083铝合金与2205不锈钢在天然海水中的电偶腐蚀行为[J].腐蚀与防护,2012,33(6):532-534.
[14]SONG G,JOHANNESSON B,HAPUGODA S,et al.Galvanic Corrosion of Magnesium Alloy AZ91D in Contact with an Aluminium Alloy,Steel and Zinc[J].Corrosion Science,2004,46(4):955-977.
[15]战广深,殷正安.Na Cl溶液中氯离子浓度对铝合金电偶腐蚀的影响[J].材料保护,1994(2):20-23.
[2]RU Ji-gang,YI Lin-na.Effect of Different Ageing Treatment on Corrosion Properties of 7B04 Alloy[J].Light Alloy Fabrication Technology,2004,32(5):45-47.
[3]李昌范,何宇廷,张胜,等.7B04-T6铝合金腐蚀疲劳交替寿命预测模型[J].航空动力学报,2016,31(5):1073-1080.
[4]杨帆,陈朝轶,李玲,等.Cl-浓度对0359铝合金在模拟海洋大气环境中腐蚀的影响[J].现代机械,2012(1):79-81.
[5]陈朝轶,杨京,李军旗,等.模拟海洋大气环境下Cl-质量分数对3003铝合金腐蚀行为的影响[J].表面技术,2015(3):116-121.
[6]李成涛,程学群,董超芳,等.Cl-对690合金腐蚀电化学行为的影响[J].北京科技大学学报,2011,33(4):444-448.
[7]朱红嫚,郑弃非,谢水生.万宁地区铝及铝合金不同距海点的大气腐蚀研究[J].稀有金属,2002,26(6):456-459.
[8]曹楚南.腐蚀电化学原理[M].北京:化学工业出版社,2008:165.
[9]李涛,李晓刚,董超芳,等.Cl-含量对2A12铝合金初期腐蚀行为的影响[J].工程科学学报,2009,31(12):1576-1582.
[10]ZAID B,SAIDI D,BENZAID A,et al.Effects of p H and Chloride Concentration on Pitting Corrosion of AA6061Aluminium Alloy[J].Corrosion Science,2008,50(7):1841-1847.
[11]GUILLAUMIN V,MANKOWSKI G.Localized Corrosion of 6056 T6 Aluminium Alloy in Chloride Media[J].Corrosion Science,2000,42(1):105-125.
[12]刘艳洁,王振尧,柯伟.2024?T3铝合金在模拟海洋大气环境中的腐蚀行为[J].中国有色金属学报,2013(5):1208-1216.
[13]刘宇,石勇,李宁,等.5083铝合金与2205不锈钢在天然海水中的电偶腐蚀行为[J].腐蚀与防护,2012,33(6):532-534.
[14]SONG G,JOHANNESSON B,HAPUGODA S,et al.Galvanic Corrosion of Magnesium Alloy AZ91D in Contact with an Aluminium Alloy,Steel and Zinc[J].Corrosion Science,2004,46(4):955-977.
[15]战广深,殷正安.Na Cl溶液中氯离子浓度对铝合金电偶腐蚀的影响[J].材料保护,1994(2):20-23.