Electrochemical study of the corrosion rate of carbon steel in soil: Evolution with time and determination of residual corrosion rates under cathodic protection
By Barbalat, M.; Lanarde, L.; Caron, D.; Meyer, M.; Vittonato, J.; Castillon, F.; Fontaine, S. & Refait, Ph.
Published in Corrosion Science
NULL
2012
Abstract
Steel coupons were buried in soil boxes for 2.5 months, with or without cathodic protection. A soil from the field was used and moistened by demineralized water or 5 g L-1 Na2SO4 solution. Instantaneous corrosion rates were deduced from voltammetry experiments while average values were obtained by weight loss measurements. A detailed analysis of the polarization curves led to an estimation of residual corrosion rates (τrc) of coupons under cathodic protection. This residual phenomenon could be followed with time and it was observed that τrc decreased down to ∼10 μm yr-1. Cathodic protection could be optimised with this methodology.
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