研究了45钢单一渗硼和添加Nd_2O_3稀土渗硼,两种方法得到的渗硼层都是由FeB和Fe_2B两相组成,但Fe_2B相的比例随着渗剂中Nd_2O_3含量的增加而增加.当渗剂中Nd_2O_3含量为5%时,渗硼层最厚达到135μn,增加50%.比较不加稀土渗硼试样和添加5%稀土渗硼试样的磨损实验结果可知:载荷小于90N时,5%稀土试样的磨损率高于不加稀土试样的磨损率.而在高载荷下情况相反;低载荷时,5%稀土试样的摩擦系数低于不加稀土试样,载荷超过90N后,两者基本一致.与未处理试样相比,两种方式得到的渗硼试样,在HCl 5 vol%溶液中的腐蚀电位变化不明显,但能显著降低腐蚀电流密度,从而降低腐蚀速率.
Boronising of 45 steel with find without addition of rare earth was carried out to obtain boride and RE-bo ride layer. Both boride layer consists of FeB and Fe_2B phases, the fraction of Fe_2B phase increases with increasing Nd_2O_3 amount in bonding agent, the thickness of boride layer exhibits a maximum value of I35μm as Nd_2O_3 content is 5% . Comparison between wear results of the RE-boronised and non RE-boronised specimens reveals that 5% RE-boronised samples exhibit a higher wear rate than that of the non RE-boronised ones as the applied load is lower than 90 N, the reverse is true at high load. 5 % RE-boronised samples show a lower coefficient of friction than that of the non RE-boronised ones under lower load condition, and both of them are almost the same as the applied load is higher than 90 N. As compared to the untreated samples,both RE-boronised and non RE-boronised specimens show almost the same corrosion potential in 5 vol% HCl solution, but the corrosion current densities decrease significantly, consequently the corrosion rates are dropped.
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