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conversion treatment was a traditional method to obtain anticorrosion film of metal[5-6]. However, in the interests of pollution control, there is a tendency to replace the chromium passivating baths by the chromium-free treatment baths. The phosphate coatings were the most promising substitutes to the chromate coating that can create good bonding between the paint film and the metal[7]. Based......
Using EIS to evaluate anti-corrosion properties of the SiC_p/5A06 aluminium MMC treated by cerium conversion coatings ZHANG Qi1,Irfan Aziz1,XIANG Min1 (1.School of Materials Science and Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China) Key words:cerium conversion coating; SiC_p/5A06 Al composite; EIS; XPS; corrosion protection; rare earths; [全文内容正在添加中] ......
Formation mechanism of an aluminium-based chemical conversion coating on AZ91D magnesium alloyWei-ping Li, Xi-mei Wang, Li-qun Zhu, and Wen Li Key Laboratory of Aerospace Materials and Performance...-based conversion coating on AZ91D magnesium alloy was studied in aluminium nitrate solutions. The morphology, composition, structure, and formation mechanism of the coating were investigated......
XPS Analysis of the Cerium Conversion Coating on the Anodized A16061/SiC_pXingwen YU, Chuanwei YAN, Chunan CAO and Guoqiang LI1) Department of Interface Chemistry and Surface Technologies, Max-Planck... based on X-ray photoelectron spectroscopy (XPS) results was introduced. The concentration of Ce-rich conversion coating on the anodized Al based metal matrix composites AI6061/SiCp was then studied......
Hydrophobic epoxy resin coating with ionic liquid conversion pretreatment on magnesium alloy for promoting corrosion resistanceLiting Guo1,2,Changdong Gu1,2,Jie Feng3,Jiangping Tu1,21. School... of Materials Science & Engineering, Zhejiang University of Technology摘 要:A hydrophobic epoxy resin coating with an environmental-friendly deep eutectic solvent......
M. Cerium-based chemical conversion coating on AZ63 magnesium alloy [J]. Surface and Coatings Technology, 2003, 172: 227-232. [7] RUDD A L, BRESLIN C B, MANSFELD F. The corrosion protection afforded... resistance of cerium-based conversion coatings on magnesium and magnesium alloys [J]. Corrosion Science, 2005, 47(4): 989-1000. [9] UMEHARA H, TAKAYA M, TERAUCHI S. Chrome-free surface treatments......
resistance of a chromium-free multi-elements complex coating on AZ91D magnesium alloy [J]. Materials Chemistry and Physics, 2006, 99: 54-60. [4] ZHANG R F, SHAN D Y, CHEN R S, HAN E H. Effects... resistance. The experimental results indicate that the dual coating is uniform, compact and pore-free. The adhesion strength between magnesium alloy substrate and electroless plating Ni-P bottom layer......
) Abstract: The electroless nickel-plating on as-cast Zr-Al alloy was studied. After degreasing, pickling, chemical conversion treatment, Ni-P coating on Zr-Al alloy was plated from the electroless... by the chemical conversion solution is formed. The film consists of small crystal particles densely. The Ni-P coating is successfully deposited on the conversion film. The electroless Ni-P coating is uniform......
,无铬转化膜的综合性能亟需进一步提升. 表1 无铬转化膜常见分类及性能 Table 1 Category and performance of chromium-free conversion coating 三价铬转化膜工艺因其具有低毒,环保且高效,耐蚀等特点,被视作替代六价铬转化膜的最有前景和应用价值的轻合金表面处理方法.值得注意的是,三价铬转化膜腐蚀过程存在铬酸盐价..., LI Wen-fang, GONG Wei-hui. Preparation of chromium-free chemical conversion coating on aluminum alloy and its performance[J]. The Chinese Journal of Nonferrous Metals, 2008, 18(10): 1839-1845. [28......
热镀锌表面镧盐转化膜生长机理的研究孔纲1,刘仁彬2,卢锦堂2,车淳山2,钟正2(1.广东省广州市华南理工大学材料科学与工程学院2.华南理工大学 材料学院)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......
