2015 年 65 巻 9 号 p. 389-395
Polarization curve of galvanically-coupled aluminum and copper specimen in 5 mass%NaCl solution was measured. Polarization resistance curves were obtained by differentiating the experimental polarization curve and have been applied to estimate corrosion rate in the environment above. The aluminum electrode was suffered from pitting attack which shows electrochemical characteristic of fast corrosion system. The corrosion rate of 0.017 mA cm−2 which has been calculated by differential polarization curve was in good agreement with that of current density which has been obtained from the results such as corrosion mass loss measurement and electric charge transferred.
