Development of Corrosion Diagnosis Method of Copper in Fresh Water by Electrochemical Measurement

Abstract

The diagnosis method for corrosion of copper in the fresh water was proposed by combining the potentiodynamic polarization curve measurement and the galvanostatic polarization measurement. The procedure for diagnosis of corrosion of copper in the various concentrations of test solution is described below: The potentiodynamic polarization curve measurement of copper → The galvanostatic polarization measurement at 500 μA cm^-2 for 10 min → The diagnosis of corrosion morphology of copper based on the potential changes of copper during the galvanostatic polarization. A corrosion map 3D was developed by the results of diagnosis of corrosion of copper. The axes of corrosion map 3D were the potential after 10 min of galvanostatic polarization at 500 μA cm^-2, the current density of potentiodynamic polarization curve of copper at 0.2 V vs. SSE and pH of the test solution. This diagram demonstrated that the corrosion morphology of copper in the various concentrations of test solution could be divided into four corrosion categories (general dissolution, general micropit, pitting corrosion, no corrosion) precisely.