电化学阻抗谱研究有机涂层体系对镁合金的腐蚀防护能力
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摘要
采用喷涂方式,在AZ91D镁合金表面涂覆一种保护性的有机涂层体系。采用电化学阻抗谱(EIS)分析了有机涂层体系在3.5%的NaCl腐蚀溶液中的电化学腐蚀行为。结合有机涂层体系在3.5%的NaCl腐蚀溶液中浸泡前和浸泡后的表面形貌、EDS分析,研究了有机涂层体系对镁合金的腐蚀防护能力。研究结果显示:在浸泡336h后,有机涂层体系仍具有较高的阻抗模值(104Ω·cm2),表明此时有机涂层体系对镁合金仍能提供良好的腐蚀防护。
A protective organic coating system was prepared on AZ91 D magnesium alloy by mechanical spray.The electrochemical corrosion behavior of the organic coating systemin 3.5% NaCl solution was investigated with electrochemical impedance spectroscopy(EIS).The corrosion protection properties of the organic coating system before and after immersion in 3.5% NaCl was studied with surface morphology and EDS analysis.Research showed that,after 336 himmersion,the organic coating system exhibited high resistant module(104Ω·cm2),which suggested that organic coating system still provided good corrosion protection for AZ91 D magnesium alloy.
A protective organic coating system was prepared on AZ91 D magnesium alloy by mechanical spray.The electrochemical corrosion behavior of the organic coating systemin 3.5% NaCl solution was investigated with electrochemical impedance spectroscopy(EIS).The corrosion protection properties of the organic coating system before and after immersion in 3.5% NaCl was studied with surface morphology and EDS analysis.Research showed that,after 336 himmersion,the organic coating system exhibited high resistant module(104Ω·cm2),which suggested that organic coating system still provided good corrosion protection for AZ91 D magnesium alloy.
引文
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[15]夏庆升,徐淑强,李青.陈化对AZ91D镁合金上磷化膜的影响及磷化膜退化机制的研究[J].功能材料,2009,12(40):2108-2110.
[2] Liu L J,Schlesinger M.Corrosion of magnesium and its alloys[J].Corrosion Science,2009,51(8):1733-1737.
[3]姜巍巍,李峻青,张密林,等.镁合金表面防护涂层的研究进展[J].电镀与涂饰,2006,25(11):42-45.
[4] Shi H W,Liu F C,Han E H.The corrosion behavior of zinc-rich paints on steel:Influence of simulated salts deposition in an offshore atmosphere at the steel/paint interface[J].Surface&Coatings Technology,2011,205(19):4532-4539.
[5] Abreu C M,Izquierdo M,Keddam M,et al.Electrochemical behaviour of zinc-rich epoxy paints in 3%NaCl solution[J].Electrochimica Acta,1996,41(15):2405-2415.
[6] Lu X Y,Yu Z,Zhao X H,et al.The study of a Mg-rich epoxy primer for protection of AZ91D magnesium alloy[J].Corrosion Science,2011,53(1):153-160.
[7]曹楚南,张鉴清.电化学阻抗谱导论[M].北京:科学出版社,2002.
[8]魏世丞,徐滨士,付东兴,等.军用装备镁合金表面防腐蚀技术研究[J].装甲兵工程学院学报,2006,20(6):79-82.
[9]恵怀兵,刘晔红,许岩.镁合金的电偶腐蚀及防护[J].电镀与精饰,2008,30(12):31-34.
[10]程英亮,陈振华,王慧敏,等.镁合金的腐蚀与防护研究进展[J].机械工程材料,2005,29(5):1-4.
[11]田昭武.电化学研究方法[M].北京:科学出版社,1984.
[12]曹楚南.腐蚀电化学[M].北京:化学工业出版社,1994.
[13]朱日彰.金属腐蚀学[M].北京:冶金工业出版社,1989.
[14]李冠群,吴国华,樊昱,等.镁合金的腐蚀研究现状与防护途径[J].材料导报,2005,19(11):60-64.
[15]夏庆升,徐淑强,李青.陈化对AZ91D镁合金上磷化膜的影响及磷化膜退化机制的研究[J].功能材料,2009,12(40):2108-2110.