Abstract
The influence of water exposure on the surface properties of plasma-sprayed Cr 2O 3 and Cr 2O 3–25 wt% TiO 2 was studied. It was shown that both plasma-sprayed materials contained Cr(VI) hydrous oxide phases, which dissolved rapidly at the beginning of water exposure. The dissolution continued slowly during the whole water exposure time. The Cr(VI) dissolution was accompanied by a rapid increase in surface IEP value. Both Cr 2O 3 and Cr 2O 3–25 wt% TiO 2 showed similar dissolution, zeta potential, and surface oxidation states. Thus the addition of TiO 2 did not influence the surface properties of the plasma-sprayed Cr 2O 3.
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