Consideration of Outputs of ACM（Atmospheric Corrosion Monitoring） Sensors Composed of Various Substrates and Variance According to Corrosion Factors

Abstract

The behavior of atmospheric corrosion monitoring （ACM） sensors composed of various anodic substrates were tested in aqueous salt solutions and through humidity cycle tests using salts. The result showed that the ACM sensors could be used in solution, and the humidity cycle tests using NaCl solution revealed a correlation of output with concentration. The result also showed that the outputs depended on the types of anode constituting the substrate used for the sensor. Meanwhile, in a test simulating atmospheric corrosion, sensors using other types of substrate showed behavior similar to that of the Fe/Ag galvanic couple sensor. However, when Al or stainless steel was employed the resulting outputs which had no relationship with the relative humidity and it seemed to be specific to the metal type. These results suggested that material corrosiveness can be directly measured by the ACM sensor.