Abstract
Recent developments in the field of corrosion in non-aqueous media lead to some questions concerning the understanding of corrosion phenomena in these solutions. The comparison of results obtained in different solutions is questionable if the main physico-chemical properties of the solutions have not been rigorously defined. In the case of acidity, which is one of the most important parameters for comprehension of the corrosion mechanisms, some difficulties arise when comparing pH measurements because of the failure of the classical aqueous pH scale in these organic solutions. This fact has been known for a long time for catalytic reactions and has led to the development of the so-called Hammett acidity functions ( H′ 0), based on the measurement of the ionization of basic indicators, namely anilines. For corrosion reactions in acidic non-aqueous media, little is known about Hammett acidity and the aim of this paper is to present some correlations between corrosion rates of Armco iron and H′ 0 in antifreeze aqueous solutions of ethylene glycol and propylene glycol. Based on electrochemical polarization measurements, the corrosion rates obtained in hydro-organic solutions of variable HCl contents have been found in agreement with previous determinations from different authors and it is established that acidity of the solutions is the main factor governing corrosion phenomena in these solutions.
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