摘要
使用SUS304与SUS430不锈钢作为研究材料,应用动电位极化曲线、交流阻抗谱（EIS）和电容电位法（Mott-Schottky）等电化学研究方法,对比研究了SUS304与SUS430不锈钢在1mol/L的NaHCO3溶液中、20-80℃温度内的腐蚀性能及其钝化膜半导体性能。结果表明,随着温度的升高,SUS304与SUS430不锈钢自腐蚀电流增加,溶液电阻与极化电阻减小,弥散效应增强;由M-S曲线知,在-0.5-0.5V电位区间,20-80℃温度内,SUS304与SUS430不锈钢钝化膜均表现为n型半导体性质,M-S曲线拟合直线斜率随温度的升高而降低,平带电位负移;可见在温度作用下,钝化膜半导体费米能级正移,使能级差减小而造成以氧空位为主要点缺陷的浓度增大,导致SUS304与SUS430不锈钢腐蚀加剧。其中SUS304奥氏体不锈钢比SUS430铁素体不锈钢具有较好的耐蚀性。本研究对探索腐蚀机理与选择合理的防腐新材料具有一定的借鉴作用。
Corrosion resistance and semiconductor property of passivation film of SUS304 and SUS430stainless steel in 1mol/L NaHCO3solution（20~80℃）were compared in terms of potentiodynamic polarization curves,electrochemical impedance spectroscopy（EIS）,and capacitive potentiometric method（Mott Schottky）.The results show that corrosion current of SUS304 and SUS430stainless steel increases,solution resistance and polarization resistance decrease,and dispersion effect increases with temperature.The M S curve shows that,within-0.5~0.5Vpotential interval and 20~80℃,passive films of SUS304 and SUS430stainless steel both show ntype semiconductor nature that the fitting line slope of the M S curve reduces and flat band potential moves to negative as temperature increasing.Therefore,under the action of temperature,semiconductor Fermi level of the passivation film moves to positive to reduce energy level difference,causing increased concentration of oxygen vacancy as main point defects and more severe corrosion of SUS304 and SUS430stainless steel.SUS304 austenitic stainless steel has better corrosion resistance than SUS430 ferritic stainless steel.The study has a certain reference value for the exploration of corrosion mechanism and selection of anticorrosive materials.
出处
《太原理工大学学报》
CAS
北大核心
2015年第3期268-273,共6页
Journal of Taiyuan University of Technology
基金
山西省国际交流合作项目:煤沥青针状焦电极材料的结构和界面电化学性能研究(2011081019)
