An electrochemical sensor for monitoring atmospheric corrosion of metallic materials was constructed.Two metallic materials with different corrosion potentials,i.e.low alloy steel and copper con-ductive paint,were chosen to form the two electrodes of the sensor based on the principle of galvanic cor-rosion.The two electrodes are separated by a thin silicone insulating film,and thus an electrochemical corrosion system may be established by the two electrodes while which was covered by a thin liquid film came from the atmosphere,correspondingly,galvanic corrosion current is generated.This galvanic cur-rent is monitored to reflect the corrosion state of the material in the environment.A new type of electro-chemical sensor was used to study the influence of factors such as insulation film thickness,liquid film thickness,temperature,relative humidity,and cathode to anode area ratio on the galvanic current with the assistance of an electrochemical workstation and a high-precision electronic balance.It is confirmed that the new electrochemical sensor has high sensitivity and can be used for monitoring the atmospheric corrosion process under thin liquid film.
关键词
大气腐蚀/传感器/实时监测/电偶电流
Key words
atmospheric corrosion/sensor/real-time monitoring/galvanic current
维普
万方数据