袁训华,陈本权,张启富,俞钢强

• 1:钢铁研究总院先进金属材料涂镀国家工程实验室
• 2:中国石油辽阳石油化纤公司机械厂

摘要(Abstract)：

分析了电解剥离过程中热镀锌合金化镀层的阳极溶解机制。结果表明,在GA镀层电解剥离的初始阶段,主要发生Zn的氧化,电解剥离过程中存在Zn和Fe之间的电耦合反应。由于镀层中微裂纹的存在,阴极反应区和镀层裂纹缝隙中会同时发生析氢反应,从而导致电偶腐蚀发生并形成诱导电流。当电解质溶液中存在氯离子时,Zn和Fe之间也会发生电耦合反应,该反应可以在一个非常小的局部区域内进行,反应过程中,氢的形核析出既可以是氢离子的重组,也可以是少量Zn和Fe的溶解反应。GA镀层中Fe-Zn金属间化合物同时发生电化学反应而溶解的现象只能在缝隙中发生,由于细小缝隙表面形成的活化区非常小,因此,GA镀层中的Fe-Zn相将分别发生溶解,从而保证了GA镀层中不同相之间的电压跃迁。

关键词(KeyWords)： 电解剥离;Fe-Zn相;热镀锌合金化镀层;裂纹;阳极溶解机制

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51071052);; 国家“十二五”科技支撑计划项目(2012BAJ13B03)

作者(Author): 袁训华,陈本权,张启富,俞钢强

DOI: 10.13289/j.issn.1009-6264.2015.02.032

参考文献(References)：

• [1]袁训华,刘昕,陈斌锴,等.合金化镀层拉伸过程中裂纹产生及扩展的原位观察[J].金属热处理,2010,35(10):11-15.YUAN Xun-hua,LIU Xin,CHEN Bin-kai,et al.In-situ observation for generation and propagation of crack in galvannealed coating during tensile process[J].Heat Treatment of Metals,2010,35(10):11-15.
• [2]Iwamoto S,Ochiai S,Okuda H.Analysis of group-buckling and-debonding behaviors of galvannealed coating layer on steel substrates under applied tensile strain[J].ISIJ International,2009,49:139-145.
• [3]Ochiai S,Iwamoto S,Nakamura T.Crack spacing distribution in coating layer of galvannealed steel under applied tensile strain[J].ISIJ International,2007,47:458-465.
• [4]Iwamoto S,Ochiai S,Okuda H,et al.Finite element analysis of interfacial debonding of the Fe-Zn intermetallic coating layer on steel substrate.[C]//Galvantech'07.7thInternational Conference on Zinc and Zinc alloy Coated Steel Sheet,Osaka,Japan,2007:236-241.
• [5]郭大伟,袁训华,顾宝珊,等.拉伸变形量对热镀锌合金化钢板耐蚀性能的影响[J].材料热处理学报,2013,34(8):153-157.GUO Da-wei,YUAN Xun-hua,GU Bao-shan,et al.Effect of drawing deformation on corrosion resisitance of galvannealed steel sheets[J].Transactions of Materials and Heat Treatment,2013,34(8):153-157.
• [6]Lee Kyung-keun,Lee In-hwan,Lee Cheul-ro,et al.In-situ observation in a scanning electron microscope on the exfoliation behavior of galvannealed Zn-Fe coating layers[J].Surface and Coating Technology,2007,201:6261-6266.
• [7]袁训华,刘昕,张启富.热镀锌合金化镀层相结构的定量分析[J].材料保护,2011,44(1):71-74.YUAN Xun-hua,LIU Xin,ZHANG Qi-fu.Quantitative analysis of phase structure of hot-dip galvanized alloying coatings[J].Journal of Materials Protection,2011,44(1):71-74.
• [8]袁训华,仲海峰,朱利明,等.不同铝含量热镀锌合金化镀层的电解剥离实验[J].材料热处理学报,2013,34(7):175-180.YUAN Xun-hua,ZHONG Hai-feng,ZHU Li-ming,et al.Electrolytic stripping of galvannealed coatings with different aluminum contents[J].Transactions of Materials and Heat Treatment,2013,34(7):175-180.
• [9]Xhoffer C,Dillen H,De Cooman B C.Quantitative phase analysis of galvannealed coatings by coulometric stripping[J].Journal of Applied Electrochemistry,1999,29:209-219.
• [10]Mishra R.Quantification of galvannealed coating phases using the galvanostatic technique[J].Metallurgical and Materials Transactions A,2008,39(8):2275-2277.
• [11]Zhang X G,Bravo I C.Electrochemical stripping of galvannealed coatings on steel[J].Corrosion,1994,50(4):308-317.
• [12]Nogueira T M C,Seixas U R,Rios P R.Application of voltammetric stripping to a galvannealed coating on an interstitial free steel[J].ISIJ International,1998,38(7):775-777.
• [13]Baudin H,Beysserias A,Dalard F,et al.Electrochemical stripping of galvannealed steel[C]//Galvatech 92.2ndInternational Conference on Zinc and Zinc Alloy Coated Steel Sheet,Amsterdam,Netherlands,1992:455-460.

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