Corrosion behavior of 0.5% chromium steel with or without the presence of commercial
inhibitors was investigated electrochemically including EIS (Electrochemical Impedance
Spectroscopy) and LPR (Linear Polarization Resistance) in an aqueous CO2 environment at
different temperatures and varying wall shear stresses. For comparison, the corrosion
behavior of C-1018 carbon steel was also evaluated in the same test environments. The
results indicated that, under the test conditions, 0.5% chromium did not improve the corrosion
resistance of C-1018 carbon steel and in fact, the corrosion rate of 0.5% chromium was higher
than that of the C-1018 carbon. However, the corrosion rate of 0.5% Cr steel was effectively
reduced by adding 10 ppm of the commercial corrosion inhibitors tested. The effect of shear
stress on inhibitor performance was not significant at the testing shear stress ranging from
36.7 to 87.4 Pa.