HOW PAINTS PREVENT CORROSION

J.E.O. Mayne (Department of Metallurgy, University of Cambridge)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Publication date: 1 August 1954

Abstract

From the electrochemical theory of corrosion it follows that corrosion can be stopped by suppressing either the cathodic or the anodic reaction, or by inserting between the cathodic and anodic areas a large resistance, which impedes the movement of ions. Calculations indicate that paint films are so permeable to water and oxygen that they cannot suppress the cathodic reaction. Paints can inhibit corrosion by modifying the anodic reaction; for this to occur the pigment must be either metallic, or basic, or soluble. In general, paint films protect by virtue of their high electrolytic resistance; they readily acquire a charge, consequently they are relatively impermeable to ions. Soap formation is beneficial, since it renders the film less permeable to electrolytes; it also yields soluble inhibitive degradation products, which have been identified.

Citation

Mayne, J.E.O. (1954), "HOW PAINTS PREVENT CORROSION", Anti-Corrosion Methods and Materials, Vol. 1 No. 8, pp. 286-290. https://doi.org/10.1108/eb018973

Publisher

:

MCB UP Ltd

Copyright © 1954, MCB UP Limited

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