Corrosion Behavior Investigation of Weathering Steel by Using Electrical Resistance Technique

Abstract

It is important to understand the relation between changeable environmental condition and corrosion behavior of each weathering steel for maintenance management of weathering steel structures. For this subject, it is thought that corrosion monitoring by using the electrical resistance technique is the most suitable. In this study, corrosion behavior in ISO16539 Method B that simulates atmospheric corrosion environment and actual use environment was measured. The difference of corrosion behavior among weathering steels could be clearly measured by the unit μm both in laboratory test and exposure test. However, in only high salinity environment, the output corrosion loss of sensor was larger than actual corrosion loss by increasing the partial electrical resistance caused by large roughness due to locally corrosion on the sensor. And applicable salinity environment for this sensor was decided up to 1 mdd of airborne sea salt. Thus, by using the electrical resistance technique, the difference of corrosion behavior of each weathering steel can be measured, furthermore, it has possibility that environmental condition in which weathering steels show significant corrosion resistance might be clarified by comparing with environmental factors.