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HCO-3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。
Cailiao Baohu 2001, 34(1), 06～07(Ch). The C02 corrosion of carbon steel in pH value 7.6～8.4 aqueous solution was studied by SEM, XRD and electrochemical means. The experimental results showed that the pH value had a profound effect on the formation of FeCO3 surface film, Crystalline state and electrochemical activity of the material.
参考文献
| [1] | Egil Gulbrandsen;Jean Herve Morard.Study of the Possible Mechanisms of Steel Passivation in Corrosion[A].Hoston TX:NACE,1999 |
| [2] | Schmitt G;Muelle M;Papenfuss M.Understanding Localized CO2 Corrosion of Carbon Steel from Physical Propertes of Iron Carbonate Scales[A].Houston TX:NACE,1999 |
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