Mapping corrosion kinetics using the wire beam electrode in conjunction with electrochemical noise resistance measurements
A wire beam electrode (WBE) has been used, in conjunction with the electrochemical noise resistance method, to determine the kinetics of nonuniform corrosion of mild steel in a carbon dioxide saturated brine. Local electrochemical parameters including corrosion potential, galvanic current, and electrochemical noise resistance were measured from local areas of a WBE surface. These parameters were used to calculate the kinetics of local electrochemical corrosion processes. A map showing instantaneous corrosion rate distribution over a WBE surface has been produced. Corrosion depths were calculated, based on instantaneous corrosion rate data, at various stages of the corrosion exposure period, and these were summed up to produce an accumulated corrosion depth map. This accumulated corrosion depth map was found to be quantitatively comparable with a microscopically observed corrosion depth map. This work shows that electrochemical corrosion kinetics can be determined using kinetic equations previously derived based on the WBE concept. This work also shows that the WBE is a novel electrode design which is suitable for performing electrochemical noise resistance measurement and that the WBE is applicable to practical corrosion conditions.
- Research Organization:
- Curtin Univ. of Technology, Perth (AU)
- OSTI ID:
- 20023342
- Journal Information:
- Journal of the Electrochemical Society, Vol. 147, Issue 2; Other Information: PBD: Feb 2000; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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