不同pH值的NaCl溶液对N80钢腐蚀磨损的影响研究

Effects of NaCl Solutions with Different pH Values on Corrosive Wear of N80 Steel

采用质量损失法和电化学方法,并结合扫描电镜(SEM)和能谱分析(EDS),研究了N80钢在不同pH值的NaCl溶液中的腐蚀磨损行为。研究结果表明:N80钢在pH值为3的NaCl溶液中腐蚀磨损速率最大,在pH值为7的NaCl溶液中腐蚀磨损速率最小;在不同pH值的NaCl溶液中,由于腐蚀与磨损存在较大的交互作用,导致N80钢试样的动态腐蚀磨损速率远远大于其静态腐蚀速率;在不同pH值的NaCl溶液中,N80钢试样动态腐蚀磨损后均未出现明显的钝化区,随着pH值的增大,其腐蚀倾向和腐蚀速率均呈现先减小后增大的变化趋势。

Corrosive wear of N80 steel in NaCl solutions with different pH values was studied by mass loss method,electrochemical method,scanning electron microscope(SEM)and energy dispersive spectroscopy(EDS).The results showed corrosive wear rate of N80 steel was the highest in NaCl solution with pH value of 3,while the lowest in NaCl solution with pH value of 7;in NaCl solutions with different pH values,the dynamic corrosive wear rates were much higher than the static corrosive rates due to the positive interaction between corrosion and wear.Meanwhile,the passivation zone of N80 steel didn’t appear in NaCl solutions with different pH values after dynamic corrosive wear;with the rise of pH value,the corrosion tendency and corrosion rate first decreased and then increased.