B. Mishra et al., DEVELOPMENT OF A PREDICTIVE MODEL FOR ACTIVATION-CONTROLLED CORROSIONOF STEEL IN SOLUTIONS CONTAINING CARBON-DIOXIDE, Corrosion, 53(11), 1997, pp. 852-859
Corrosion of steel in carbon dioxide (CO2)-containing solutions is con
sidered a chemical reaction-controlled process. A corrosion rate equat
ion was derived on the basis of fundamental reaction rate theory and c
ompared to empirically determined relationships reported in the litera
ture. The predictive equation was developed as a function of pH, parti
al pressure of CO2 (P-CO2), and temperature, The equation. allows the
inclusion of other variables, such as flow, impurities, inhibitors, an
d steel microstructure, through the reaction constant. The application
limit for this equation extends to the point where corrosion becomes
diffusion-controlled as a result of the formation of stable corrosion
products on the steel surface.