The uptake of benzoate and acetate ions from aqueous solutions into the air-formed oxide film on mild steel has been studied by means of radioactive tracers. The extent of uptake is found to depend on solution pH in a regular manner, consistent with the concept of repair of defects in the air-formed oxide by insoluble material, the composition of which depends on the level of anodic acidity. Direct evidence for the formation of discrete, microscopic regions of intense uptake of the inhibitive anions is provided by high resolution autoradiography.
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References
1.
EvansU. R., ‘The Corrosion and Oxidation of Metals’, 1st Supp. Vol., 1968. p.64 (London: Arnold)
