氮元素对2Cr13不锈钢CO2腐蚀产物膜结构和电化学性能的影响

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．

EFFECT OF ELEMENT N ON THE MICROSTRUCTURE OF CO2 CORROSION FILM OF 2Cr13 STAINLESS STEELS

In this paper, the effect of N element on the CO2 corrosion capability of the 2Cr13 stainless steel was researched.The corrosion films of the steels were observed by SEM, and the surface components of the films were analyzed by XPS; the electrochemical impedance spectrum (EIS) of the steels was analyzed by impedance measure system ( PARSTAT 2273), and the corrosion rates of the stainless steels was measured by weight loss method. The obtained results show that the structure of the corrosion film of the 13CrMoTiNbN steel is looser, Cr2O3 is replaced by CrN and Na3CrO4 on the surface of the film, and there is a amount of Fe3O4 and a-FeOOH phases. The impedance value of the 13CrMoTiNbN steel is less than the 13CrMoTiNb steel, and the corrosion rate of the 13CrMoTiNbN steel is more.