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The corrosion and hydrogen embrittlement behaviours of tantalum in concentrated sulfuric acid solutions ranging from 80 to 98% at the elevated temperatures from 205 to 300C have been studied in order to determine feasibility of tantalum as a construction material of the acid digestion equipment for the pultonium-contaminated organic wastes. Moreover, the inhibiting effects of the addition of N-O compounds such as nitric acid, nitrates, nitrites and NO, gases on both the corrosion of tantalum and the hydrogen absorption in tantalum have been also investigated. The results obtained are summarized as follows: (1) The corrosion rate of tantalum and the amount of hydrogen absorbed by tantalum increase with increase of sulfuric acid concentration and solution temperature. (2) Tantalum is uniformly attacked and the amount of hydrogen absorbed by tantalum increases proportionally with corrosion rate of tantalum. (3) Tantalum becomes brittle when the hydrogen content in tantalum exceeds about 100ppm. (4) The corrosion rate of tantalum and the amount of hydrogen absorbed by tantalum are simultaneously reduced by the addition of N-O compounds to the sulfuric acid solutions. (5) These inhibiting effects can be attributed to that nitrogen dioxide formed from N-O compounds in the sulfuric acid solutions is adsorbed on tantalum.

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Inhibition of Corrosion and Hydrogen Embrittlement of Tantalum in Concentrated Sulfuric Acid Solutions at Elevated Temperatures by Addition of N-O Compounds