| 摘 要： | The effect of residual dissolved oxygen(DO)on the corrosion behavior of carbon steel in 0.1 M Na HCO_3solution was investigated by electrochemical measurements,corrosion mass loss test,scanning electron microscopy(SEM)and X-ray diffraction(XRD).In the initial immersion stage,the increase of the dissolved oxygen concentration led to the change of from a reductive state of active dissolution to an oxidizing state of pseudo passivation in low carbon steel.While in the final stage,all the steels transformed into the steady state of pseudo passivation.In the anaerobic solution,the formation ofα-Fe OOH was attributed to the chemical oxidization of the ferrous corrosion products and the final cathodic process only included the reduction ofα-Fe OOH,while in the aerobic solution,it included the reduction of oxygen andα-Fe OOH simultaneously.As the main corrosion products,the content ofα-Fe OOH was increased while that of Fe_6(OH)_(12)CO_3was decreased with increasing concentration of dissolved oxygen.The total corrosion mass loss of the steel was promoted with the increase of dissolved oxygen concentration.
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