腐蚀产物对6061铝合金海洋大气腐蚀过程的影响
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摘要
以盐雾模拟海洋大气环境,对6061铝合金进行了盐雾腐蚀,研究腐蚀产物对6061铝合金腐蚀过程的影响。运用扫描电子显微镜(SEM)、电化学阻抗谱(EIS)以及光学轮廓测量技术(OP)分析了表面带腐蚀产物6061铝合金的电化学性能以及其腐蚀形貌。结果表明:6061铝合金表面的腐蚀产物对基体具有保护作用,但随着腐蚀时间的延长,腐蚀产物对基体的保护作用呈减弱趋势;在腐蚀过程中,6061铝合金的腐蚀以点蚀为主,腐蚀产物在点蚀扩展后期阻碍了点蚀坑的扩展,并促使点蚀逐步向均匀腐蚀转变。
6061 aluminium alloy was corroded in salt-spray as a simulated marine atmospheric environment to study the effect of corrosion products on the corrosion process of 6061 aluminium alloy.The electrochemical characteristics and corrosion morphology of 6061 aluminium alloy covered by corrosion products were analyzed by scanning electron microscopy(SEM),electrochemical impedance spectroscopy(EIS)and optical profilometry(OP).The results show that the corrosion product layer on the surface of 6061 aluminium alloy had a protective effect on the substrate,but the protective effect became weak with the increase of corrosion time.Pitting was the main form in the corrosion process of 6061 aluminium alloy.Corrosion products acted as a barrier to prevent the growth of pits,and promoted the transformation from pitting corrosion into uniform corrosion in the later stage of pitting corrosion.
6061 aluminium alloy was corroded in salt-spray as a simulated marine atmospheric environment to study the effect of corrosion products on the corrosion process of 6061 aluminium alloy.The electrochemical characteristics and corrosion morphology of 6061 aluminium alloy covered by corrosion products were analyzed by scanning electron microscopy(SEM),electrochemical impedance spectroscopy(EIS)and optical profilometry(OP).The results show that the corrosion product layer on the surface of 6061 aluminium alloy had a protective effect on the substrate,but the protective effect became weak with the increase of corrosion time.Pitting was the main form in the corrosion process of 6061 aluminium alloy.Corrosion products acted as a barrier to prevent the growth of pits,and promoted the transformation from pitting corrosion into uniform corrosion in the later stage of pitting corrosion.
引文
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[3]王平,孙心利,马东伟,等.输变电设备大气腐蚀情况调查与分析[J].腐蚀科学与防护技术,2012(6):525-526.
[4]陈剑光,苏贲,罗雪,等.近海含SO2环境中高压隔离开关铝合金部件的组织及腐蚀特征[J].腐蚀与防护,2017,38(4):252-255.
[5]杨大宁,董凯辉,符传福,等.海南电网刀闸铝合金部件腐蚀失效分析[J].腐蚀科学与防护技术,2016(1):82-87.
[6]董超芳,生海,安英辉,等.Cl-作用下2A12铝合金在大气环境中腐蚀初期的微区电化学行为[J].北京科技大学学报,2009(7):878-883.
[7]董超芳,安英辉,李晓刚,等.7A04铝合金在海洋大气环境中初期腐蚀的电化学特性[J].中国有色金属学报,2009(2):346-352.
[8]周和荣,李晓刚,董超芳,等.铝合金在模拟SO2污染大气环境中的腐蚀行为[J].航空材料学报,2008(2):39-45.
[9]周和荣,马坚,李晓刚,等.高强铝合金在不同SO2模拟环境中的腐蚀行为以及相关性研究[J].中国腐蚀与防护学报,2011(6):446-452.
[10]周和荣,姚望,刘鹏洋,等.周期凝露和二氧化硫环境对7A04铝合金腐蚀行为的影响[J].材料研究学报,2017(5):359-368.
[11]周和荣,马坚,李晓刚,等.表面沉积氯化钠的7A04铝合金在模拟环境中的腐蚀行为[J].中国有色金属学报,2009(5):974-980.
[12]孙擎擎,孙睿吉,陈送义,等.大气污染物对7B50铝合金电化学腐蚀性能的影响[J].中国有色金属学报,2015(3):575-581.
[13]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.
[14]李涛,冯海涛,李晓刚,等.2A12铝合金在含Cl-环境中的腐蚀行为和规律研究[J].材料科学与工艺,2011(3):43-48.
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[16]SONG G,LIU M.Corrosion and electrochemical evaluation of an Al-Si-Cu aluminum alloy in ethanol solutions[J].Corrosion Science,2013,72(S):73-81.
[17]郑传波,李春岭,益帼,等.高强铝合金6061和7075在模拟海洋大气环境中的腐蚀行为[J].材料保护,2014(6):38-41.
[18]SONG F,ZHANG X,LIU S,et al.Anisotropy of localized corrosion in 7050-T7451 Al alloy thick plate[J].Transactions of Nonferrous Metals Society of China,2013,23(9):2483-2490.
[19]戴芸,刘胜胆,邓运来,等.7020铝合金在3.5%NaCl溶液中的点蚀行为[J].中国腐蚀与防护学报,2017(3):279-286.
[20]孙飞龙,李晓刚,卢琳,等.5052和6061铝合金在中国南海深海环境下的腐蚀行为研究[J].金属学报,2013(10):1219-1226.
[21]WANG Y,CHENG G,LI Y.Observation of the pitting corrosion and uniform corrosion for X80steel in3.5wt.%NaCl solutions using in-situ and 3-D measuring microscope[J].Corrosion Science,2016,111(S):508-517.