Corrosion mechanism of stainless steel in nitric acid solutions containing ruthenium compounds
Creators
- 1. Hitachi Research Laboratory, Hitachi, Ltd., Ibaraki (Japan)
Description
The effect of ruthenium on corrosion of stainless steel in nitric acid solutions ws evaluated through immersion test, electrochemical measurement, quantitative analysis of RuO4 or NOx and corrosion test under gamma-irradiation. Under non-irradiation, Ru3+ or RuNO3+ was oxidized to RuO4 in concentrated nitric acid solutions at high temperature, and the corrosion of stainless steel was promoted first through by the reduction of RuO4 to a lower valent state compound like RuO2. If the reduction product of RuO2 was deposited on stainless steel , then the corrosion was further promoted through a catalytic function of the deposit for a reduction of nitric acid to HNO2. It was found that the promotion of corrosion with ruthenium was extremely reduced by gamma-irradiation (1 x 106 R/h), due to inhibition of the oxidation of RuO4 from Ru3+ or RuNO3+ by formation of nitrous acid resulting from radiolysis of nitric acid solution. (author)
Additional details
Publishing Information
- Journal Title
- Zairyo To Kankyo
- Journal Volume
- 48
- Journal Issue
- 4
- Journal Page Range
- p. 235-241
- ISSN
- 0917-0480
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 30033005
- Subject category
- S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE;
- Descriptors DEI
- CONCENTRATION RATIO; CORROSION; GAMMA RADIATION; NITRIC ACID; REACTOR VESSELS; REDUCTION; RUTHENIUM OXIDES; SOLUTIONS; STAINLESS STEEL-304L; X-RAY SPECTROSCOPY
- Descriptors DEC
- ALLOYS; AUSTENITIC STEELS; CARBON ADDITIONS; CHALCOGENIDES; CHEMICAL REACTIONS; CHROMIUM ALLOYS; CHROMIUM-NICKEL STEELS; CONTAINERS; CORROSION RESISTANT ALLOYS; DISPERSIONS; ELECTROMAGNETIC RADIATION; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; HIGH ALLOY STEELS; HOMOGENEOUS MIXTURES; HYDROGEN COMPOUNDS; INORGANIC ACIDS; INORGANIC COMPOUNDS; IONIZING RADIATIONS; IRON ALLOYS; IRON BASE ALLOYS; LOW CARBON-HIGH ALLOY STEELS; MATERIALS; MIXTURES; NICKEL ALLOYS; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; RADIATIONS; RUTHENIUM COMPOUNDS; SPECTROSCOPY; STAINLESS STEELS; STEEL-CR19NI10-L; STEELS; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENT COMPOUNDS