Using the photoinduced volt-ampere curves to study the p/n types of the corrosion products with semiconducting properties

This article specifically addresses the issue that there is no suitable method to determine the semiconductor types of non-uniformly distributed corrosion products. The photoinduced volt-ampere (i-V) curve is proved to be able to accurately measure the p/n type of corrosion products, in addition, it can also be used to study the transfer direction of the photogenerated electrons and quantitatively measure the photoelectrochemical effects of the corrosion products with semiconducting properties. This work will help to promote the study of the influencing mechanism of light illumination on corrosion process of metals and the photoelectrochemical cathodic protection mechanism.