Author： Friedrich C. Kritzer P. Boukis N. Franz G. Dinjus E.
Publisher： Springer Publishing Company
ISSN： 0022-2461
Source： Journal of Materials Science, Vol.34, Iss.13, 1999-07, pp. : 3137-3141
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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 H_2SO_4 increased strongly above the critical temperature of water, which was attributed to a phase transformation from vitreous to crystalline Ta_2O_5. Corrosion rates in H_3PO_4 were low at all temperatures due to the formation of a top phosphate layer.
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