Abstract

SILVA, José Maurílio da  and  BRASIL, Simone L.. Evaluation of Soil Corrosivity Criterion Based on Hydrogen Overpotential. Corros. Prot. Mater. [online]. 2010, vol.29, n.1, pp.19-25. ISSN 0870-1164.

The corrosion of buried metallic structures demands significant costs from many industrial sectors. The necessity of proper evaluation of the soil aggressiveness, for instance, requires indirect measurements that correlate the soil properties with its absolute corrosivity. In this work, physical-chemical and electrochemical parameters have been obtained for several soil samples, such as resistivity, pH, corrosion potential and hydrogen overpotential. Such measurements, including weight loss results, define an original criterion to characterize the soil corrosivity. This criterion is based on the hydrogen reduction cathodic reaction. In soils with low resistivity values, oxygen reduction can be present and, in this case, the study should be carefully analyzed.

Keywords : Corrosion; Soils; Hydrogen Overpotential.

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