Corrosion potential behavior in high temperature water of noble metal-doped alloys coatings deposited by underwater thermal spraying
- GE Corporate Research and Development Center, Schenectady, NY (United States)
- GE Nuclear Energy, San Jose, CA (United States)
The electrochemical corrosion potential of 304 stainless steel coated under water by hyper-velocity oxy-fuel and plasma spray techniques using noble metal doped powders was measured to evaluate the catalytic behavior in high temperature water under various water chemistry conditions. Thermal spray coatings of noble metal doped powders exhibited catalytic behavior for the recombination of oxygen and hydrogen in high temperature water which causes the corrosion potential to decrease well below a critical value of {minus}230 mV{sub she} for the intergranular stress corrosion cracking protection in water. This was observed in water containing various amounts of oxygen and hydrogen peroxide when stoichiometric excess hydrogen was present.
- OSTI ID:
- 203750
- Report Number(s):
- CONF-950816--; ISBN 1-877914-95-9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
BWR TYPE REACTORS
CATALYTIC EFFECTS
CORROSION PROTECTION
CRACK PROPAGATION
ELECTROCHEMICAL CORROSION
EXPERIMENTAL DATA
INTERGRANULAR CORROSION
PERFORMANCE
PROTECTIVE COATINGS
STAINLESS STEEL-304
STRESS CORROSION
TRANSITION ELEMENT ALLOYS
WATER CHEMISTRY