The corrosion of tantalum in oxidizing sub- and supercritical aqueous solutions of HCl, H2SO4 and H3PO4 |
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| Authors: | C. Friedrich P. Kritzer N. Boukis G. Franz E. Dinjus |
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| Affiliation: | (1) Forschungszentrum Karlsruhe, ITC-CPV, P.O. Box 3640, D-76021 Karlsruhe, Germany |
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| Abstract: | The corrosion of tantalum was investigated in sub- and supercritical oxidizing solutions of hydrochloric, sulfuric and phosphoric acid at temperatures between 360 and 500 °C. The corrosion rates in HCl and H2SO4 increased strongly above the critical temperature of water, which was attributed to a phase transformation from vitreous to crystalline Ta2O5. Corrosion rates in H3PO4 were low at all temperatures due to the formation of a top phosphate layer. |
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