氮元素对2Cr13不锈钢CO_2腐蚀产物膜结构和电化学性能的影响

EFFECT OF ELEMENT NITROGEN ON THE MICROS-TRUCTURE AND ELECTROCHEMICAL BEHAVIOR OF CO_2 CORROSION SCALE OF 2Crl3 STAINLESS STEELS

利用高温高压釜进行2Cr13不锈钢的高温高压CO2腐蚀实验,用扫描电镜(SEM)和X射线光电子谱(XPS)分析腐蚀产物膜的形貌和成分,电化学交流阻抗谱测试腐蚀产物膜对2Cr13不锈钢电极过程影响,失重法评价两种2Cr13不锈钢CO2均匀腐蚀速率．结果表明:含氮钢的腐蚀产物膜结构比较疏松,腐蚀膜中的Cr2O3被CrN和Na3CrO4部分替代,并且含有较多的Fe3O4和α-FeOOH,其膜的电阻值比不含氮的2Cr13钢的小,腐蚀速率较大．

The effect of nitrogen addition on CO2 corrosion resistance of 2Cr13 stainless steels was researched by scanning electron microscopy （SEM）, X-ray photoelectron spectroscopy （XPS）, electrochemical impedance spectroscopy （EIS） and mass loss method. The results show that the corrosion scale of the N-containing 2Cr13 steel was looser than that of the 2Cr13 steel without N, and the primary scale Cr203 was part replaced by CrN and Na3CrO4, and more Fe3O4 and α-FeOOH phases appeared. The impedance value of the N-containing 2Cr13 steel was less than that of 2Cr13 steel without N, and the general corrosion rate of the former was higher than that of the latter.