Influence of long-term aqueous exposure on surface properties of plasma-sprayed oxides Cr2O3 and Cr2O3-25 wt% TiO2

Mika Harju; Mikael Järn; Per Dahlsten; Juha-Pekka Nikkanen; Jarl B Rosenholm; Tapio Mäntylä

doi:10.1016/j.jcis.2008.06.010

Influence of long-term aqueous exposure on surface properties of plasma-sprayed oxides Cr2O3 and Cr2O3-25 wt% TiO2

J Colloid Interface Sci. 2008 Oct 15;326(2):403-10. doi: 10.1016/j.jcis.2008.06.010. Epub 2008 Aug 3.

Authors

Mika Harju¹, Mikael Järn, Per Dahlsten, Juha-Pekka Nikkanen, Jarl B Rosenholm, Tapio Mäntylä

Affiliation

¹ Department of Materials Science, Tampere University of Technology, P.O. Box 589, 33101 Tampere, Finland. mika.harju@tut.fi

PMID: 18675989
DOI: 10.1016/j.jcis.2008.06.010

Abstract

The influence of water exposure on the surface properties of plasma-sprayed Cr(2)O(3) and Cr(2)O(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(2)O(3) and Cr(2)O(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(2)O(3).