2022 年 61 巻 1 号 p. 168-172
A real–time imaging electrochemical measurement system was developed for an in–situ observation of brass dezincification corrosion. This system allows for a video recording of brass cross–section under galvanostatic polarization. The progress of erosion associated with the dezincification corrosion in the depth direction on the brass cross–section was successfully observed from the video recording during the measurement. The erosion depth at each measurement time could be estimated from the cross–section images, indicating that the erosion depth was drastically increased at arbitrary time under galvanostatic polarization. It suggested that the erosion rate in the depth direction is strongly related to the dissolution behavior of zinc and copper from brass surface, namely, the preferential dissolution and the simultaneous dissolution. The relation between the dissolution behavior and the electrode potential of brass under galvanostatic polarization was discussed.
