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Corrosion monitoring of galvanized steel in soil extract solutions by electrochemical impedance spectroscopy
Author(s) -
Lopes I. M. F.,
Loureiro C. R. O.,
Junqueira R. M. R.
Publication year - 2014
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201400243
Subject(s) - galvanization , dielectric spectroscopy , corrosion , metallurgy , materials science , soil water , corrosion monitoring , electrochemistry , environmental science , electrode , composite material , soil science , chemistry , layer (electronics)
The chemical and structural complexity of soils, coupled with their heterogeneity, contributes to the increase in soil aggressiveness, which can in turn result in severe corrosion of underground materials. The understanding of corrosive processes of underground structures is important in aiding the development of methods, as well as in monitoring and maintenance, in an attempt to minimize environmental, social, and economic impacts. In this work, electrochemical impedance spectroscopy (EIS) was used to monitor the corrosive process of galvanized steel when in contact with soil extracts, aimed at evaluating the potentiality of applying electrochemical impedance spectroscopy when monitoring underground structures. To accomplish this, the behavior of the galvanized steel when undergoing corrosion was studied for 105 days, examining the variations in the eletrochemical parameter values obtained through EIS assays over this period. EIS proved to be effective in the study of corrosive processes of galvanized steel when in contact with soil extracts, identifying the different stages of the corrosive process, controlled by mass and/or charge transfer reactions.