Investigation on Accuracy Improvement of Corrosion Measurement by Electric Resistance Method in Atmospheric Corrosion Environment

Abstract

For corrosion evaluation of steel products in atmospheric corrosion environment, exposure test of test specimens has generally been conducted. However, it is not possible to evaluate the detailed changes of corrosion loss due to environmental variance.

For this problem, the electric resistance technique which converts the corrosion loss from continuously measuring the increase of electric resistance seems to be more suitable. In order to measure the corrosion loss with high accuracy, it was found that the structure of the sensor which can minimize the effect of the localized corrosion which controls the whole resistance by increasing the local electric resistance and make the dry and wet cycle of the sensor equal to the evaluation target is important.