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Tribollet egaf9
1. The Cost of Corrosion
Introduction to Corrosion
UPR15 du CNRS, Laboratoire des Interfaces et
Systèmes Electrochimique
Université Pierre et Marie Curie
4 place Jussieu, 75252 Paris cedex 05, France
Bernard TRIBOLLET
2. The Cost of CorrosionThe Cost of Corrosion
Italy GNPItaly GNP ≈≈ 10101212
Euro/yearEuro/year
Cost of corrosionCost of corrosion ≈≈ 3 103 101010
€/year, i.e.€/year, i.e. ≈≈ 500 €/person/year500 €/person/year
9. Introduction to corrosion
The metal or metal alloy dissolves in presence of water
For example Fe can dissolves as Fe2+
according to the reaction:
Fe → Fe2+
+ 2 e-
This electrochemical reaction is depending of the electrode potential V
This dependance is given by the Tafel’s law : )Vbexp(ki FeFe=
The metal is isolated on an electrical point of view, then the produced electrons
must be consumed by another reaction.
This other reaction could be the water or the oxygen reduction can be considered:
H2O+e-
↔1/2 H2 + OH-
or O2 + 4 H2O + 4 e-
→ 4 OH-
The corresponding Tafel’s law is: )Vbexp(ki 22 OO −−=