Field and Laboratory Detection of AC Corrosion Using High-Sensitive ER-Technology

摘要

This paper states that high sensitivity ER sensors can be applied with great success and as a necessary tool in AC corrosion detection. The effect of the coating defect size (and geometry) is observed in both ohmic spread resistance and polarisation behaviour (diffusion and charge transfer kinetics. Spread resistance is entirely in control of the density of the AC current. In turn, for certain AC polarisation behaviour, AC current density conducts the peak values in off-potential and corrosion behaviour. The coating defect size accordingly becomes a very important parameter when designing coupons in general and ER sensors in particular.