Inhibition of Corrosion and Hydrogen Embrittlement of Tantalum in Concentrated Sulfuric Acid Solutions at Elevated Temperatures by Addition of N-O Compounds
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- Fukuzuka Toshio
- Central Research Laboratory, Kobe Steel, Ltd.
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- Shimogori Kazutoshi
- Central Research Laboratory, Kobe Steel, Ltd.
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- Satoh Hiroshi
- Central Research Laboratory, Kobe Steel, Ltd.
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- Kamikubo Fumio
- Central Research Laboratory, Kobe Steel, Ltd.
Bibliographic Information
- Other Title
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- N-O系化合物添加による, 高温高濃度硫酸溶液中タンタルの腐食と水素吸収脆化の抑制
- N Oケイ カゴウブツ テンカ ニヨル コウオン コウ ノウド リュウサン ヨ
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Abstract
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 300°C 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 NOx, 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.
Journal
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- CORROSION ENGINEERING
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CORROSION ENGINEERING 30 (6), 327-336, 1981
Japan Society of Corrosion Engineering
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Details 詳細情報について
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- CRID
- 1390001206260242432
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- NII Article ID
- 130006024649
- 130004731431
- 20000181192
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- NII Book ID
- AN00225595
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- ISSN
- 18841155
- 00109355
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- NDL BIB ID
- 2318975
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed