论文部分内容阅读
采用电化学方法研究了碳钢在中性水介质中的ＣＯ２腐蚀速率及溶液ｐＨ值变化对腐蚀过程的影响。通过对碳钢表面形成的ＦｅＣＯ３膜在腐蚀前后的ＳＥＭ和Ｘ衍射分析与观察发现，膜的致密性和稳定性，在ｐＨ值为７．６～８．４时较好，ｐＨ值过高或过低都会使膜的结构发生明显变化，因而会增加腐蚀。在中性水溶液中，由于ＨＣＯ３浓度增加，ｐＨ值虽上升，但阴极还原反应仍在增加，因而ＦｅＣＯ３膜结构的变化影响不大。
Electrochemical methods were used to study the effects of CO2 corrosion rate and solution pH on the corrosion process of carbon steel in neutral aqueous medium. Through the SEM and X-ray diffraction analysis and observation before and after the formation of the FeCO3 film on the surface of the carbon steel, the denseness and stability of the film are found to be good at a pH value of 7.6 to 8.4, too high a pH value or Too low a significant change in the structure of the membrane, which will increase corrosion. In neutral aqueous solution, due to the increase of HCO3 concentration, the pH value increases, but the cathodic reduction reaction is still increasing, so the change of FeCO3 membrane structure has little effect.