Corrosion behavior of Ni and Ni-based alloys in concentrated NaOH solutions at high temperatures
Corrosion behavior of SUS 310S austenitic stainless steel, Alloy 600, Monel 400, and Ni 200 and NaOH solutions in the concentration range 30-60% at high temperatures up to 166/sup 0/C was studied. In solutions containing dissolved oxygen or under oxidizing conditions, all the specimens examined were corroded seriously due to oxygen diffusion through the porous oxide layer consisting of ..beta..-Ni(OH)/sub 2/. In hydrogen-saturated solutions, on the other hand, these Ni alloys were corrosion resistant because nickel in the alloys was active to oxidation of hydrogen. The specimens were corroded by deaerated solution at high temperatures in which hydrogen evolution took place as the counterreaction. The corrosion rate controlled by the hydrogen formation reaction increased exponentially with the decrease of the Ni content in the alloy.
- Research Organization:
- Dept. of Applied Chemistry, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya (JP)
- OSTI ID:
- 6049965
- Journal Information:
- J. Electrochem. Soc.; (United States), Vol. 135:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AUSTENITIC STEELS
CORROSION
OXYGEN
DIFFUSION
CHEMICAL COMPOSITION
CORROSION RESISTANT ALLOYS
ELECTROCHEMISTRY
HIGH TEMPERATURE
HYDROGEN EMBRITTLEMENT
INCONEL 600
MONEL 400
NICKEL
NICKEL BASE ALLOYS
SODIUM HYDROXIDES
SOLUTIONS
ALKALI METAL COMPOUNDS
ALLOY-NI66CU32
ALLOY-NI76CR15FE8
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
CHEMISTRY
CHROMIUM ALLOYS
COPPER ALLOYS
DISPERSIONS
ELEMENTS
EMBRITTLEMENT
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROGEN COMPOUNDS
HYDROXIDES
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ADDITIONS
MANGANESE ALLOYS
MATERIALS
METALS
MIXTURES
MONEL
NICKEL ALLOYS
NIMONIC
NIOBIUM ALLOYS
NONMETALS
OXYGEN COMPOUNDS
SODIUM COMPOUNDS
STEELS
TITANIUM ADDITIONS
TITANIUM ALLOYS
TRANSITION ELEMENTS
360105* - Metals & Alloys- Corrosion & Erosion