Figure 9.

A) Open circuit potential plots of CoCrMo in phosphate buffered saline (PBS, pH 7.4, room temperature) and in solutions modified with HCl (pH 1 and 3) and H₂O₂ (0.03M). OCP was raised above PBS levels to a higher oxidizing potential when acid alone, or H₂O₂ alone were added to the PBS solution (see arrows). When both acid and H₂O₂ are added to PBS, the OCP rises to above 0.6 V vs Ag/AgCl which is a highly oxidizing condition for CoCrMo. B) Polarization plots of CoCrMo in PBS solutions with differing amount of H₂O₂. As H₂O₂ concentration increases from 0.1 mM to up to 30 mM, the corrosion currents rise significantly above the PBS alone and the corrosion potential shifts positively to 0.2 V.