一种铝合金无铬磷酸盐稀土转化膜的结构
Structrure of Non-chromium Phosphate Rare Earth Conversion Coating
摘 要
采用扫描电镜、X射线衍射、电流-时间和电位-时间曲线等方法, 对6061铝合金表面含Zn、Fe、P、O、Ce而不含铬的复合磷酸盐转化膜的表面形貌、相结构、成分及磷化过程动力学进行了初步的分析和研究。结果表明, 添加了稀土的磷化膜表面的块状结晶更加致密, 颗粒更小, 外观呈浅灰色, 其晶粒排列纵横交错; 磷化膜的主要成分为磷酸锌和磷酸铁锌, 添加了稀土的磷化液中所形成磷化膜的衍射强度明显降低, 且其衍射峰也明显变宽。
形貌
电位和电流时间曲线
相结构
转化膜成分
rare earth conversion coating
morphology
potential and current-time curve
phase structrural
phosphating film component
Abstract
The phosphating film′s appearance, phase structrure, components and phosphating dynamics were studied by means of potential and current-time curves, scanning electron microscopy (SEM) and X-ray diffraction(XRD). The phosphating film was formed on 6061 aluminium alloy surface and contained Zn, Fe, P, O and chromium compound. The results showed that the block crystals in the surface film with the addition of rare earth were especially compact, and the grains were smaller. The appearance was light gray and the crystal particle arrangement was arranged in a criss-cross pattern. The main components of phosphorus film were tribasic zinc phosphate and ferric phosphate zinc. The diffraction intensity of the phosphating film with the addition of rare earth reduced obviously, and the diffraction peak was also changed to wider obviously.
中图分类号 TG178
所属栏目 试验研究
基金项目 河南省自然科学研究项目(2008A150016), 新乡市科技发展计划(07G058)
收稿日期 2010/12/24
修改稿日期 2011/1/31
网络出版日期
作者单位点击查看
联系人作者陈改荣(xxcgr@163.com)
备注陈改荣, 教授,
引用该论文: LI Hong-ling,CHEN Gai-rong. Structrure of Non-chromium Phosphate Rare Earth Conversion Coating[J]. Corrosion & Protection, 2011, 32(9): 694
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参考文献
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【2】金属磷化处理[M]. 雷作缄等译. 北京:机械工业出版社, 1992:90-92.
【3】谭海林, 肇基, 李新立. Fe2+对电镀锌板磷化的影响[J]. 材料保护, 2003, 36(7):42-44.
【4】Richdardson M O W. The “P/P+H”ratio ralated to phosphate corrosion resistance[J]. Transaction of Institute of Metal Finishing, 1990(3): 99-103.
【5】Miyawaki T. Study on the“P/P+H”ratio ralated to phosphate corrosion resistance[J]. Proceedings of Interfinish, 1980(2):3-5.
【6】Satoh N. Effects of heavy metal additions and crystal modification on the zinc phosphating of electrogalvanized steel sheet[J]. Suftace and Coatings Technology, 1987, 30(2):171-181.
【7】张圣麟, 李红玲, 娄淑芳, 等. 一种低温锌系磷化促进剂的动力学研究[J]. 表面技术, 2006, 35(6):40-42.
【8】张圣麟, 杨丽云, 张小麟. 硝酸铈对6061铝合金磷化过程的影响[J]. 稀土, 2008, 29(6): 37-38.
【9】张圣麟, 李朝阳, 陈华辉, 等. 铝合金稀土硝酸盐磷化的电化学行为[J]. 中国腐蚀与防护学报, 2009, 29(1):60-62.
【10】邝钜炽. 添加稀土引致的磷化膜变化与促进机制[J]. 腐蚀科学与防护技术, 2006, 18(3):190-191.
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