稀土对机械合金化制备碳钢表面铬合金层的影响

Effect of RE on Surface Coating of Carbon Steel by Mechanical Alloying

以纯铬粉和Cr+RE[w(RE)=10%]硅铁粉末组合为原始粉末,利用行星球磨机,制备高铬合金层。采用X射线衍射、扫描电镜、能谱等方法分析合金层成分、显微结构及元素分布,并用多种实验手段检测合金层的显微硬度、抗热剥落能力及在NaCl和H2SO4腐蚀介质中的耐蚀性,以探讨稀土元素对合金层性能的影响。实验结果表明,合金层的显微硬度显著提高,抗剥落能力得到明显改善,在质量分数为3.5%的NaCl溶液中的耐腐蚀性能也得到较大提高。

A Cr coating layer with and without RE were obtained by mechanical alloying. X-ray diffraction （XRD）, Scanning electron microscopy （SEM）, energy dispersive X-ray spectroscopy （EDS） were used to investigate the microstructure and the elements distribution. Microhardness test, heat shock experiment and electrochemical corrosion technique were used to analyze the properties of coating and evaluate the effect of RE. The results showed that the properties of coating had improved largely.