Estimation of residual corrosion rates of steel under cathodic protection in soils via voltammetry |
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| Affiliation: | 1. Laboratoire des Sciences de l’Ingénieur pour l’Environnement (LaSIE), FRE 3474 CNRS – Université de La Rochelle, Bât. Marie Curie, Avenue Michel Crépeau, 17042 La Rochelle Cedex 01, France;2. GDF SUEZ, CRIGEN, 361 Avenue du Président Wilson, BP 33, 93211 Saint Denis La Plaine, France;3. GRTgaz/CTE/PNE, 5 rue Ferdinand de Lesseps, 60200 Compiègne, France;4. TIGF, 49 Avenue Dufau, BP 5222, 64022 Pau, France;5. TOTAL, EP/TDO/TEC/COR Tour Coupole 22D67, 92078 Paris-La Défense Cedex, France;1. National Cooperative for the Disposal of Radioactive Waste (Nagra), Hardstrasse 73, 5430 Wettingen, Switzerland;2. Jacobs, HQ Building, Thomson Avenue, Harwell Campus, Didcot, Oxfordshire, OX11 0GD, United Kingdom;3. Durability of Engineering Materials, Institute for Building Materials (IfB), ETH Zurich, Stefano-Franscini-Platz 3, 8093, Zurich, Switzerland;4. Intera Incorporated, Swiss Branch, Hardstrasse 73, 5430, Wettingen, Switzerland;1. Key Laboratory of Cluster Science (Ministry of Education of China) and Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry, Beijing Institute of Technology, Beijing 100081, PR China;2. Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada;3. Department of Chemistry, Beijing Normal University, Beijing 100875, PR China |
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| Abstract: | Steel coupons were buried in soil for 2 months under cathodic protection. Their residual corrosion rates were deduced from voltammetry and weight loss measurements. In aerated soils, the current density due to O2 reduction, jK,O2, was modelled with a mixed activation–diffusion controlled kinetic. The anodic part jA of the current density j, computed as jA = j ? jK,O2, obeyed Tafel law. Its extrapolation to the protection potential gave a corrosion rate (～7 μm yr?1) consistent with that obtained from weight loss measurements. With a deficient protection, corrosion rates remained at ～80 μm yr?1, a value given by both methods. |
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| Keywords: | A Steel C Cathodic protection B Cyclic voltammetry B Weight loss B Polarization |
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