CORROSION BEHAVIOR OF NEW Cr-Ni-Cu LOW ALLOY SEAWATER CORROSION RESISTANT STEEL
Two kinds of Cr-Ni-Cu low alloyed steels were designed,0.1%C-0.7%Cr-1.2%Ni-0.7Cu and 0.1%C-0.7%Cr-0.3%Ni-0.5Cu.With the method of SEM,XRD and electrochemical analysis and testing technology,periodic immersion accelerated corrosion test was carried out to investigate the corrosion resistance of the designed steels in simulated marine environment.The steel with best corrosion resistance was selected,and then focused on the variation of its corrosion rate with time.The results indicated that the designed Cu-Cr-Ni low alloyed steels showed better corrosion resistance than 20MnSi,the ratio of their corrosion rates was 0.44.The corrosion rate of designed steels decreased gradually to 3~4 g/(mm2 h)with the elongation of test period,while the corrosion rate of 20MnSi kept downward trend,not reach stability,and the corrosion rate gap between them became smaller.The Cr element banding enriched in the inner rust can withstand the diffusion of Cl-.Besides,the addition of Ni raised the self-corrosion potential of the bare steels and promoted the transformation of-FeOOH to-FeOOH,and consequently,improved the stability of the rust and the corrosion resistance of steels.
Low alloyed steel Seawater corrosion resistance Accelerated corrosion test Alloying element enrichment
Piaopiao Zhang Zhongmin Yang Ying Chen Huimin Wang
Central Iron and Steel Research Institute,76th Xueyuan North Road,Haidian,Beijing,100081,China
国内会议
杭州
英文
1055-1062
2015-11-11（万方平台首次上网日期，不代表论文的发表时间）