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Electrochemical behaviour of paint films in sea-water: A suggested mechanism

✍ Scribed by Crennell, J. T.

Book ID
102329256
Publisher
Wiley (John Wiley & Sons)
Year
1950
Weight
328 KB
Volume
69
Category
Article
ISSN
0368-4075

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✦ Synopsis

Abstract

The cathodic character of painted or otherwise partially screened steel in sea‐water is explained by the retention behind the pint‐film of the products of reaction of local corrosion couples. Local anodes behind the film will be suppressed by accumulation of ferrous ions. Alkalinity produced at local cathodes renders the steel passive and so encourages passage of further current in the same direction.

Experiments are described showing that an iron electrode transferred from neutral to alkaline salt solution becomes temporarily anodic, then quickly becomes cathodic as passivity develops.

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