In-situ Monitoring Test on Corrosivity of Atmospheric Environment Where Electrical Control Unit Was Set Up

Abstract

To investigate the corrosivity of the atmospheric environment where the electrical control unit was set up, the corrosion rates of silver and copper were monitored by the quartz crystal microbalance and temperature, relative humidity and the insulation resistance were monitored simultaneously with each equipment. In this environment, the corrosion rate of silver was larger than the corrosion rate of copper. From the classification of the severity of the installation environment based on JIS C0116 and ISA-S71.04, the corrosivity of the atmospheric environment was comparatively not severe. However the migration was generated even in the environments with the highest relative humidity of 62% and the insulation resistance higher than 10¹⁰Ω for the measurement period.