INOR 4 |
| Polyoxometalates (POMs) reveal high capability as corrosion inhibitors for different metals. Results of XPES and other studies of POMs adsorption will be presented. Polyoxotungstates are effective in inhibition of aluminum in high-temperature water. They form a surface film preventing re-crystallization of stable gamma-Al2O3 and shift the pitting potential toward positive values. H3PMo12O40 in H2SO4 greatly diminishes the anodic current of steel dissolution. XPES analysis has revealed noticeable accumulation of Mo in the surface layer at the active dissolution potential. POMs involving Fe(III) is precipitated on the surface suppressing dissolution of metal. POMs involved in surface film also protect titanium in strong HNO3. This work is in progress like studying POMs, including H8CeMo12O42, capable to protect spent uranium fuel rods. It is assumed that POMs are built in the oxide layer probably with formation of polymeric complex. According to calculation of the surface layer thickness POMs form nanoscale protective films. |
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Polyoxometalates and Related Clusters in Chemistry and Nanoscience
9:00 AM-12:30 PM, Sunday, August 19, 2007 BCEC -- 204 A/B, Oral
Division of Inorganic Chemistry |