Effects of cerium on microstructure and bonding strength of Cu-14Al-4.5Fe bronze plasma sprayed coating

Cu-14Al-4.5Fe bronze powders with and without 0.6% Ce were prepared and their coatings were fabricated on 45# carbon steel substrate by atmospheric plasma spraying. The effects of rare earth Ce on the coating interface bonding strength, coatings and bonding interface vertical sections microstructure were investigated by tensile machine, X-ray diffraction analysis, scanning electron microscopy (SEM) and electronic probe microanalysis (EPMA). The results showed that the shape of powders was more spherical like, and the coating’s hardness and interface bonging tensile strength would be improved to 8.9% and 17.4%, respectively, higher than that of the Cu-14Al-4.5Fe coating without 0.6% Ce added. The refined of κ phases, well distributed matrix phases in coatings and the promotion of Fe, Al elements diffusion led to the improvement in interface bonding strength and hardness of the Cu-14Al-4.5Fe coating with addition of 0.6% Ce, which hardened and strengthened the coating.     

Ce对铝青铜合金粉体材料涂层在5.0% H2SO4溶液中腐蚀行为的影响

利用等离子喷焊技术,将自主研究开发的多元铜合金粉末(含Ce和不含Ce)涂覆在45#钢表面,通过静态浸泡腐蚀实验、电化学实验,采用X射线衍射、表面EDS、EPMA等分析手段,研究Ce对多元铝青铜粉末熔覆层在5.0%H2SO4溶液中耐腐蚀性能及腐蚀行为的影响。结果表明,在5.0%H2SO4溶液中,合金粉体涂层发生了选择性脱成分腐蚀,稀土元素Ce能改善铝青铜合金粉体涂层的自腐蚀电位,提高该涂层的耐腐蚀性能。