Abstract
The corrosion products formed as a new phase in a metal-atmosphere system influence atmospheric corrosion mechanisms, particularly over a long term. Water adsorption in corrosion products is very important, because it determines the time during which corrosion occurs at metal-corrosion products interface. Adsorption isotherms of the corrosion products formed on steel exposed in a coastal and a rural atmospheres were obtained. The chloride, sulfate and bicarbonate concentrations in these products were also determined. A polymolecular adsorption mechanism was determined for corrosion products formed in a coastal environment, while a monomolecular adsorption takes place in corrosion products formed in a rural one. A notable difference between chloride concentration in corrosion products and chloride deposition rate determined by the dry plate method was determined. This situation was not the same in the case of sulfate ions. It means that corrosion takes place under very variable concentrations of chloride ions and in the presence of less variable concentrations of sulfate ions.
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