Evaluation of corrosion rate of 1040 carbon steel in soil by electrochemical frequency modulation (EFM)

ABSTRACT

The instantaneous corrosion rate of 1040 carbon steel buried in soil was measured by electrochemical frequency modulation (EFM) and linear polarization resistance (LPR). The results were compared to each other and to the corrosion rate data obtained by the analysis of corrosion coupons exposed in field. The values of instantaneous corrosion rate found in the soil by EFM were 0.088 ± 0.008 mm / year, by LPR of 0.075 ± 0.005 mm / year. The corrosion rate values obtained by weight loss of corrosion coupons were 0.064 ± 0.016 mm / year. Thus, in the experimental conditions imposed it can be inferred that the results obtained by the EFM technique served to diagnose the performance of 1040 carbon steel subjected to a soil corrosion process.

Keywords
Corrosion rate; carbon steel; soil; EFM; LPR