Corrosion potential behavior in high-temperature water of noble metal-doped alloy coatings deposited by underwater thermal spraying
- General Electric Corporate Research and Development Center, Schenectady, NY (United States)
- General Electric Nuclear Energy, San Jose, CA (United States)
Intergranular stress corrosion cracking (IGSCC) of sensitized stainless steel (SS) components in boiling water reactors (BWR) is a major concern. The SCC susceptibility of structural materials in high-temperature water is affected by the electrochemical corrosion potential (ECP). The ECP of type 304 stainless steel coated under water by hyper-velocity oxy-fuel (HVOF) and plasma-spray (PS) 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 caused ECP to decrease well below a critical value of {minus}230 mV{sub SHE} for 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.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 244981
- Journal Information:
- Corrosion, Vol. 52, Issue 6; Other Information: DN: Paper presented at the 7th International Symposium on Materials Degradation in Nuclear Power Systems--Water Reactors, Breckenridge, CO (US), August 1995; PBD: Jun 1996
- Country of Publication:
- United States
- Language:
- English
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