【摘要】 采用全浸泡腐蚀方法,利用扫描电镜(SEM)、能谱分析(EDS)、X射线衍射(XRD)、失重法、极化曲线和交流阻抗(EIS)等分析手段,对超级13Cr油管钢在不同pH值NaCl溶液中的腐蚀形貌、腐蚀速率、腐蚀产物及其腐蚀膜层的电性能进行了分析,研究了超级13Cr油管钢在NaCl溶液中的腐蚀行为与腐蚀膜层电性能,结果表明:超级13Cr油管钢在酸性的NaCl溶液中具有较好的抗腐蚀性能,其表面腐蚀膜层具有钝化特性,随着溶液pH值的降低,其腐蚀膜层的钝化性能增强,发生点蚀的倾向性减小,而发生全面腐蚀的倾向性增大,其腐蚀产物为Fe和Cr的氧化物组成。当溶液pH值大于4.5时,腐蚀速率随着溶液pH值的减小而增大;当溶液pH值小于4.5时,腐蚀速率随着溶液pH值的减小而减小。更多还原

【Abstract】 The corrosive behaviors of super 13Cr tubing steels were investigated by an immersion corrosion test in NaCl solution with the different pH values,the scanning electron microscopy(SEM), energy dispersive analyzed(EDS),X-ray diffraction(XRD),mass loss,polarization and the electrochemical impedance spectroscopy(EIS)were employed to analyze corrosion morphologies,corrosion rate,corrosion products and electric characteristic of surface corrosive films.The results show that the corrosive films on super 13Cr tubing steels with passive characteristic,so which has good corrosion resistance properties in the acidic NaCl solution.With the pH values of NaCl solution decreased, the passive performance of the corrosive films on super 13Cr tubing steels corrosion increase,and the tendency of pitting corrosion decrease,and also the tendency of general corrosion increase.The corrosion products of super 13Cr tubing steels are consist of Fe and Cr oxides in acidic NaCl solution.When the solution pH values are greater than 4.5,the corrosion rate increase with the solution pH values decrease,when the solution pH values are less than 4.5,the corrosion rate decrease with the solution pH values decrease.更多还原