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在生产条件下采用冲入法制备了改性纳米SiC粉体强化奥氏体不锈钢试样,用化学浸泡和电化学检测两种方法研究了纳米SiC粉体对不锈钢耐点蚀性能的影响。结果表明,经改性纳米SiC粉体强化处理后的不锈钢组织明显细化,成分偏析引起的铁素体析出减少;当纳米SiC粉体加入量为0.1 mass%时,不锈钢的点蚀速率降低了16%,电极电位提高了3倍。能谱分析表明,经强化处理,不锈钢中的Cr成分偏析减轻,有效改善了晶界等易发生点蚀部位的贫Cr现象。
The modified nano-SiC powder-strengthened austenitic stainless steel was prepared by punching method under the production conditions. The effects of nano-SiC powder on the pitting corrosion resistance of stainless steel were studied by chemical immersion and electrochemical measurements. The results show that the microstructure of the stainless steel strengthened by the modified nano SiC powder is obviously refined and the precipitation of ferrite by the component segregation is reduced. When the nano SiC powder is added by 0.1 mass%, the pitting corrosion rate of the stainless steel decreases 16%, electrode potential increased by 3 times. The energy spectrum analysis shows that the Cr content segregation in the stainless steel is reduced by the strengthening treatment, which effectively improves the Cr depletion phenomenon such as grain boundary.