碳钢表面铈盐钝化膜和铈盐-硅烷复合钝化膜的耐蚀性能
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摘要
碳钢常规铈盐钝化膜的耐蚀性不够理想。以硝酸铈和过氧化氢配制钝化液,通过化学浸泡处理,在Q235碳钢表面制备铈盐钝化膜;通过KH-560硅烷偶联剂对铈盐钝化件进行二次封孔处理,制备了铈盐-硅烷复合钝化膜;对2种钝化膜试样进行了NSS,EIS,SEM和EDS测试。试验结果显示,铈盐钝化膜明显提高了基材的耐蚀性能,但是钝化膜表面存在一些微孔和裂缝,对其耐蚀性能造成不利影响;而硅烷膜能够完整覆盖和填充铈盐钝化膜表面的缝隙和微孔,改善了铈盐钝化膜的耐蚀性能。
In this paper,cerium salt passivation film was prepared on the surface of carbon steel by chemical immersion in the passivation solution of cerium nitrate and hydrogen peroxide. Cerium salt passivation film was then sealed by KH-560 silane coupling agent to prepare the cerium salt / silane composite passivation film. Two kinds of passivation films were assessed by NSS,EIS,SEM and EDS tests. The experimental results showed that the corrosion resistance of the substrate was improved obviously by cerium salt passivation film,but there were some micro-pores and cracks on the surface of cerium salt passivation film,which had a negative effect on the corrosion resistance. However,the silane film could completely cover the cracks and fill micro-holes of the surface of the cerium salt passivation film,which further improved the corrosion resistance of cerium salt passivation film.
In this paper,cerium salt passivation film was prepared on the surface of carbon steel by chemical immersion in the passivation solution of cerium nitrate and hydrogen peroxide. Cerium salt passivation film was then sealed by KH-560 silane coupling agent to prepare the cerium salt / silane composite passivation film. Two kinds of passivation films were assessed by NSS,EIS,SEM and EDS tests. The experimental results showed that the corrosion resistance of the substrate was improved obviously by cerium salt passivation film,but there were some micro-pores and cracks on the surface of cerium salt passivation film,which had a negative effect on the corrosion resistance. However,the silane film could completely cover the cracks and fill micro-holes of the surface of the cerium salt passivation film,which further improved the corrosion resistance of cerium salt passivation film.
引文
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[2]郑帅,张英杰,章江洪.锌表面稀土转化膜的研究进展[J].材料保护,2010,43(4):51~53.
[3]Aramaki K.A self-healing protective film prepared on zinc by treatment in a Ce(NO3)3solution and modification with Ce(NO3)3[J].Corrosion Science,2005,47(5):1 285~1 298.
[4]顾宝珊,刘建华.过氧化氢对铈盐转化膜形成过程影响的电化学阻抗谱研究[J].腐蚀科学与防护技术,2011(2):143~146.
[5]顾宝珊,刘建华.电化学阻抗谱研究铈盐转化膜形成过程中的影响因素[J].中国稀土学报,2009(5):679~683.
[6]卢锦堂,钟正,孔纲.锌及镀锌层稀土转化膜研究进展[J].电镀与涂饰,2008(11):34~37.
[7]吴海江,徐国荣,许剑光,等.热镀锌钢铈盐/硅烷复合膜的制备及其耐蚀性能[J].材料保护,2013,46(1):16~18.
[8]徐斌,满瑞林,倪网东,等.镀锌钢板表面硅烷、铈盐复合膜的制备及耐腐蚀性能研究[J].涂料工业,2007,37(12):46~50.