| 热镀锌表面镧盐转化膜生长机理的研究 |
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| 引用本文： | 孔纲,刘仁彬,卢锦堂,车淳山,钟正.热镀锌表面镧盐转化膜生长机理的研究[J].金属学报,2010(4). |
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| 作者姓名： | 孔纲 刘仁彬 卢锦堂 车淳山 钟正 |
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| 作者单位： | 华南理工大学材料学院; |
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| 基金项目： | 国际锌协会资助项目IZA/CA/059~~ |
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| 摘 要： | 在常规稀土镧盐钝化液中添加以柠檬酸添加剂,从而在热镀锌层表面获得镧盐转化膜.采用中性盐雾实验(NSS)分析膜层耐蚀性能,确定最佳成膜时间范围.通过扫描电镜(SEM)、能谱仪(EDS)、X射线光电子能谱(XPS)、红外光谱(IR)分析了膜层的结构、微观形貌和化学成分.结果表明,转化膜耐蚀性能与铬酸盐钝化膜相当;膜层微观上存在裂纹,且裂纹随着成膜时间的延长而变宽;膜层主要由柠檬酸镧和La(OH)_3等组成;转化膜的生长过程中,前期以柠檬酸镧吸附膜的沉积为主,中期La(OH)_3与柠檬酸镧相互渗透沉积,后期La(OH)_3沉积逐渐占据主导.
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| 关 键 词： | 稀土转化膜 镀锌钢 柠檬酸 |
STUDY ON GROWTH MECHANISM OF LANTHANUM SALT CONVERSION COATING ON GALVANIZED STEEL |
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| KONG Gang,LIU Renbin,LU Jintang,CHE Chunshan,ZHONG Zheng College of Materials Science , Engineering,South China University of Technology,GuangZhou.STUDY ON GROWTH MECHANISM OF LANTHANUM SALT CONVERSION COATING ON GALVANIZED STEEL[J].Acta Metallurgica Sinica,2010(4). |
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| Authors: | KONG Gang LIU Renbin LU Jintang CHE Chunshan ZHONG Zheng College of Materials Science Engineering South China University of Technology GuangZhou |
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| Affiliation: | KONG Gang,LIU Renbin,LU Jintang,CHE Chunshan,ZHONG Zheng College of Materials Science , Engineering,South China University of Technology,GuangZhou 510640 |
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| Abstract: | Rare earth conversion coating was proposed as one of the most prospective alternatives to toxic chromate conversion coatings on some metals and alloys.In this work,the lanthanum salt conversion coating was obtained by immersing a galvanized steel in a lanthanum salt passivation solution modified with citric acid.Scanning electron microscopy(SEM),X-ray energy dispersive spectrometer(EDS),X-ray photoelectron spectroscopy(XPS) and infrared spectroscopy(IR) were used to investigate its structure and composition... |
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| Keywords: | rare earth conversion coating galvanized steel citric acid |
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