Abstract
The effect of five factors, CO2 partial pressure, H2S partial pressure, temperature, chloride content and bicarbonate content, on corrosion rate of API-13Cr and super 13Cr steels under sweet and light sour environments was systematically investigated and comprehensively analized.Since an essential reaction determining corrosion rate in CO2 environment is the direct reduction of carbonic acid, the carbonic acid activity becomes a key parameter to synthesize the effects of environmental factors, instead of pH. The CO2 corrosion rate is equated principally as a function of carbonic acid activity and temperature.The effect of slight amount of H2S and effect of alloying element content are also described quantitatively.
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