Abstract
In-situ corrosion rate measurements are of practical on-site interest and of fundamental research concern. The paper reviews applications of linear polarisation measurements, electrochemical impedance, harmonic analysis, electrochemical noise, potential and current mapping. Their advantages and limitations are discussed and examples of their use presented. Linear polarisation resistance appears to offer the investigator the simplest and most acceptable technique to date, provided the instrumentation is appropriately designed. Measurements can be made on-site using suitably arranged probes. Harmonic analysis, an extension of electrochemical impedance, appears to offer advantages for future development as the polarisation and kinetic Tafel constants required for the corrosion rate determination are obtained simultaneously. Current mapping of macro-corrosion areas can be conducted in a similar manner as potential mapping. This uses an air cathode coupled via a zero resistance ammeter to the reinforcement. The polarisation currents measured are able to discriminate between various corrosion areas and appear more effective on-site than potential measurements.(A)
| Original language | English |
|---|---|
| Title of host publication | Unknown Host Publication Title |
| Publisher | London, U.K., Elsevier Applied Science |
| ISBN (Print) | 1851664874, 9781851664870 |
| State | Published - 1990 |
ASJC Scopus subject areas
- General Engineering