【摘要】 <正> 离子注入技术已超出了半导体工业的范围,成为材料科学中强有力的研究手段,并在材料改性领域中开始了工业应用。有人认为离子束技术是进行“材料设计”的手段,是实现“从天然材料到人造材料时代的关键。稀土元素在冶金中的应用很有前途,加入适量稀土可改善钢的机械性能、加工性能和耐蚀性能。但稀土元素改善钢的耐蚀性的作用和机理都有待深入研究,而用离子注入技术系统研究稀土元素改善钢的耐蚀性的工作尚未见报道。我国稀土资源丰富,系统地研究注入稀土元素的作用有重要意义。为了改善航空发动机轴承的抗局部腐蚀性能,美国海军实验室曾将Cr、Mo等常规耐蚀合金元素注入到轴承钢表层,并取得良好效果。本工作亦显示了注入稀土元素改善轴承钢抗点蚀特性的潜力。更多还原

【Abstract】 Five kinds of rare earth elements have been implanted into steel No. 45 and GCr15 bearing steel respectively. The corrosion resistances of the specimens have been examined using electrochemical dynamic potential method, in a NaAc/HAc solution for steel No. 45 specimens and in a NaAc/HAc solution containing 0.1mol/1 NaCl for GCr15 bearing steel specimens. It has been found that the aqueous solution corrosion resistances of steel No. 45 are obviously modified by implantation of RE element, and the pitting corrosion properties of GCr15 bearing steel are significantly improved due to heavy RE element implantation.更多还原