Coating Inspection

Corrosion Process :

• The natural corrosion of steel involves the formation of an electrochemical corrosion cell.  This cell is made up of an anode and a cathode, typically at two different sites on the steel component, an electrolyte, and an electrical connection between the anode and cathode. 

• The chemical reaction at the steel anode site is the oxidation of the metal, followed generally by oxide or hydroxide formation:

Fe ®   Fe⁺⁺ + 2 e^-                         (1)

Fe⁺⁺ + 2OH^-®  Fe(OH)₂                  (2)

• At the same time, an electrochemical reaction, generally the reduction of atmospheric oxygen, occurs at the steel cathode site:

½O₂ + H₂O + 2e^- ®  2OH^-             (3)

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