Effect of Chelation and Oxidation on Reducing Galvanic Corrosion between Cobalt and Copper in Alkaline Slurry

The synergistic reaction of chelating agent and hydrogen peroxide on Co/Cu galvanic corrosion in weak alkaline slurry were investigated in this work. The experimental results show that the oxide and hydroxide passivation films on the surface of cobalt and cooper can suppress the corrosion caused by oxidation by increasing the concentration of hydrogen peroxide. While the passive film on copper surface dissolved when the chelating agent was added and cobalt had higher erosion potential than copper and the galvanic corrosion could be disposed effectively when the difference of open circuit potential of the decrease to 20mV.