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Electrochemical study of the corrosion rate of carbon steel in soil: Evolution with time and determination of residual corrosion rates under cathodic protection |
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| Authors: | M. Barbalat L. Lanarde D. Caron M. Meyer J. Vittonato F. Castillon S. Fontaine Ph. Refait |
| Affiliation: | 1. Laboratoire d’étude des matériaux en milieux agressifs (LEMMA), EA 3167, Université de La Rochelle, Bât. Marie Curie, Av. Michel Crépeau, 17042 La Rochelle Cedex 01, France;2. GDF SUEZ, CRIGEN, 361 Av. du Président Wilson, BP 33, 93211 Saint Denis La Plaine, France;3. TOTAL, EP/TDO/TEC/COR Tour Coupole 22D67, 92078 Paris-La Défense Cedex, France;4. TIGF, 49 Av. Dufau, BP 5222, 64022 Pau, France;5. GRTgaz/CTE/PNE, 5 rue Ferdinand de Lesseps, 60200 Compiègne, France |
| 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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