Corrosion potential behavior in high temperature water of noble metal-doped alloys and coatings on structural materials by underwater thermal spraying
- GE Corporate Research and Development Center, Schenectady, NY (United States)
- GE Nuclear Energy, San Jose, CA (United States)
Intergranular stress corrosion cracking (IGSCC) of sensitized stainless steel (SS) components in boiling water reactors (BWRs) is known to be a major concern. SCC susceptibility of structural materials in high temperature water is affected by the corrosion potential. 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:
- 367713
- Report Number(s):
- CONF-960389-; TRN: IM9640%%459
- Resource Relation:
- Conference: National Association of Corrosion Engineers (NACE) annual corrosion conference and exposition: water and waste water industries, Denver, CO (United States), 24-29 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of Corrosion/96 conference papers; PB: [6615] p.
- Country of Publication:
- United States
- Language:
- English
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