Copper Pourbaix Diagram
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Corrosion Potentials:
The Pourbaix diagram indicates that below a pH of 7 and at higher oxidation potential, copper can corrode. Since D.I. water typically has a pH value less then 6 and has an oxidation range in the vicinity of Cu(+2), thermodynamically copper can corrode.
Corrosion Rates:
The Tafel plots show that with the addition of a corrosion inhibitor, the corrosion rate of cobalt can be reduced from 1.76 angstroms/minute to 0.0026 Angstroms/minute.
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