Mg含量对真空蒸镀Zn-Mg镀层耐蚀性的影响
Effect of Mg Content on the Corrosion Resistance of Zn-Mg Alloy Coatings Deposited by Vacuum Palting
摘 要
采用盐雾试验及电化学方法等对真空蒸镀Zn-Mg合金镀层的显微组织及耐蚀性进行了研究。结果表明，Mg的质量分数为4.5%时，Zn-Mg合金镀层具有较好的耐蚀性，此镀层经过720 h盐雾试验后仍未出现红锈，耐蚀性至少是纯Zn镀层的9倍。XRD结果表明Zn-Mg合金镀层中存在能够提高耐蚀性的MgZn2相和Mg2Zn11相，其经过盐雾腐蚀后的腐蚀产物主要为氧化锌（ZnO）、碱式氯化锌[Zn5（OH）8Cl2·H2O]、碱式碳酸锌[Zn4CO3（OH）6·H2O]和Zn5（CO3）2（OH）6等。Zn5（OH）8Cl2·H2O致密且绝缘性好，能抑制阴极反应和疏松ZnO的形成，从而使得Zn-Mg合金镀层具有优异的耐蚀性。
真空镀
蒸镀
耐蚀性
zinc-magnesium alloy coating
vacuum plating
evaporation
corrosion resistance
Abstract
Microstructure and corrosion resistance of vacuum-evaporated Zn-Mg alloy coating were studied by salt spray test and electrochemical methods. The results show that when the mass fraction of Mg was 4.5%, the Zn-Mg alloy coating had relatively good corrosion resistance. After 720 h of salt spray test, no red rust appeared on the surface of the coating, and the corrosion resistance of the coating was at least 9 times that of the pure Zn coating. XRD analysis showed that MgZn2 phase and Mg2Zn11 phase which could improve the corrosion resistance appeared in the coating. After salt spray corrosion, the corrosion products on the coating surface were mainly zinc oxide (ZnO), basic zinc chloride [Zn5(OH)8Cl2·H2O], basic zinc carbonate [Zn4CO3(OH)6·H2O] and Zn5(CO3)2(OH)6 etc. Zn5(OH)8Cl2·H2O was dense and had good insulating properties, which could inhibit the cathodic reaction and the formation of loose ZnO, so that the Zn-Mg alloy coating had excellent corrosion resistance.
中图分类号 TG178 DOI 10.11973/fsyfh-202011008
所属栏目 试验研究
基金项目
收稿日期 2018/11/19
修改稿日期
网络出版日期
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引用该论文: QIU Xiaopan,LIU Qiuyuan,LIU Xin,JIANG Sheming,ZHANG Qifu. Effect of Mg Content on the Corrosion Resistance of Zn-Mg Alloy Coatings Deposited by Vacuum Palting[J]. Corrosion & Protection, 2020, 41(11): 50
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【2】RAMANAUSKAS R,QUINTANA P,MALDONADO L,et al. Corrosion resistance and microstructure of electrodeposited Zn and Zn alloy coatings[J]. Surface and Coatings Technology,1997,92(1/2):16-21.
【3】SHORT N R,ZHOU S,DENNIS J K. Electrochemical studies on the corrosion of a range of zinc alloy coated steel in alkaline solutions[J]. Surface and Coatings Technology,1996,79(1/2/3):218-224.
【4】刘秋元. 蒸镀锌镁合金镀层的制备与耐蚀性研究[D]. 包头:内蒙古科技大学,2014.
【5】NAKANO H,OUE S,KOBAYASHI S,et al. Mg-contained Zn electroplating from aqueous solution containing quaternary ammonium salt[J]. Tetsu-to-Hagane,2004,90(10):801-806.
【6】ARAGA K,SHIGE H,IWAI M,et al. Zn-Mg electroplated metal sheet and fabrication process thereof:Eur Pat 1036862[P]. 2000.
【7】NAKAKOJI H,NAKAJIMA S,YASUDA A,et al. Method of producing a steel sheet plated with zinc-magnesium alloy superior both in plating adhesion and corrosion resistance,and sheets plated with it:Eur Pat 424856[P]. 1991.
【8】MORISHITA M,KOYAMA K,MURASE M,et al. Improvement in the corrosion resistance of zinc-plated steel by electrodeposition of magnesium from a molten salt[J]. ISIJ International,1996,36(6):714-719.
【9】NISHIMURA K,SHINDO H,NOMURA H,et al. Corrosion resistance of hot dip Zn-Mg galvanized steel sheet[J]. Tetsu-to-Hagane,2003,89(1):174-179.
【10】KOLL T,ULLRICH K,FADERL J,et al. Properties and potential applications of novel ZnMg alloy coatings on steel sheet[J]. Revue De Métallurgie,2004,101(7/8):543-550.
【11】毛鑫光,马进,颜秉熙,等. 真空镀钢板锌镁合金防腐蚀镀层研究进展[J]. 真空科学与技术学报,2013,33(6):593-597.
【12】METZNER C,GOEDICKE K,HOETZSCH G,et al. Electron beam-PVD for enhanced surface properties on metallic strips and sheets[J]. Surface and Coatings Technology,1997,94/95:663-668.
【13】SCHUHMACHER B,SCHWERDT C,SEYFERT U,et al. Innovative steel strip coatings by means of PVD in a continuous pilot line:process technology and coating development[J]. Surface and Coatings Technology,2003,163/164:703-709.
【14】魏云鹤,于萍,刘秀玉,等. 钢基表面热镀锌镁合金镀层及其耐蚀性能研究[J]. 材料工程,2005,33(7):40-42.
【15】HONDA K,YAMADA W,USHIODA K. Solidification structure of the coating layer on hot-dip Zn-11%Al-3%Mg-0.2%Si-coated steel sheet[J]. Materials Transactions,2008,49(6):1395-1400.
【16】KAWAFUKU J,KATOH J,TOYAMA M,et al. Properties of zinc alloy coated steel sheets obtained by continuous vapor deposition pilot-line[C]//SAE Technical Paper Series,400 Commonwealth Drive,Warrendale,PA,United States:SAE International,1991:43-50.
【17】KOLL T,ULLRICH K,FADERL J,et al. Properties and potential applications of novel ZnMg alloy coatings on steel sheet[J]. Revue De Métallurgie,2004,101(7/8):543-550.
【18】毛鑫光,马进,颜秉熙,等. 真空镀钢板锌镁合金防腐蚀镀层研究进展[J]. 真空科技与技术学报,2013,33(6):593-597.
【19】PROSEK T,NAZAROV A,BEXELL U,et al. Corrosion mechanism of model zinc-magnesium alloys in atmospheric conditions[J]. Corrosion Science,2008,50(8):2216-2231.
【20】HAUSBRAND R,STRATMANN M,ROHWERDER M. Corrosion of zinc-magnesium coatings:Mechanism of paint delamination[J]. Corrosion Science,2009,51(9):2107-2114.
【21】颜飞,杨立红,陈圣,等. 真空镀锌镁合金镀层微观结构表征[J]. 宝钢技术,2010,28(5):42-46.
【22】PROSEK T,NAZAROV A,BEXELL U,et al. Corrosion mechanism of model zinc-magnesium alloys in atmospheric conditions[J]. Corrosion Science,2008,50(8):2216-2231.
【23】SCHWERDT C,RIEMER M,KOEHLER S,et al. Application related properties of novel Zn-Mg coated steel sheet[J]. Stahl und Eisen,2004,124(9):69-74.
【24】曹楚南. 腐蚀电化学基础[M]. 北京:科学出版社,1985:37-48.
【25】MURAKAMI Y,KAMEI K. Hitetsu kinzoku zairyo-gaku[M]. Tokyo:Asakura Shoten,1978(2):151.
【26】YAMAMOTO H,MASUNO Y,SHIRAI H,et al. Corrosion resistance of Zn-Mg alloy plating prepared by electrodeposition from EMIB based ionic liquid[J]. Journal of the Surface Finishing Society of Japan,2006,57(1):84.
【27】HUBER K. Anodic formation of coatings on magnesium,zinc,and cadmium[J]. Journal of the Electrochemical Society,1953,100(8):376.
【28】HAYASHI K,MIYOSHI Y. Reaction of zinc corrosion at under-film corrosion tips of coatings[J]. Tetsu-to-Hagane,1992,78(10):1577-1584.
【29】HOSKING N C,STROM M A,SHIPWAY P H,et al. Corrosion resistance of zinc-magnesium coated steel[J]. Corrosion Science,2007,49(9):3669-3695.
【30】LINDSTROM R. On the chemistry of atmospheric corrosion:a laboratory study on Zn and Mg/Mg-Al alloys[D]. Goteborg:Goteborg University,2001.
【31】FALK T,SVENSSON J E,JOHANSSON L G. The influence of CO2 and NaCl on the atmospheric corrosion of zinc:a laboratory study[J]. Journal of the Electrochemical Society,1998,145(9):2993-2999.
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