2015 年 36 巻 1 号 p. 24-28
A study on atmospheric corrosion monitoring by electrochemical impedance method has been reviewed. A new type of corrosion sensor, which consists of pin and ring electrodes embedded concentrically in epoxy resin, was successfully applied for the corrosion monitoring. The sensor response showed that the corrosion rate of steel in the sunny day was higher at night than in daytime. The corrosion loss calculated from the monitoring data agreed well with that estimated from the surface roughness by a laser microscope. In addition, the monitoring system has been applied to estimate corrosion resistance at each part of steel model structure exposed to outdoor environment. Low solution resistance and high corrosion rate were measured at all parts in rainfall time. From the corrosion monitoring for about a year, the corrosion loss was larger at horizontal part than at perpendicular part, and the under side of flange gave the largest corrosion loss.
