Application of insulated protective coatings for reduction of corrosion potential of type 304 stainless steel in high-temperature water
- General Electric Corporate Research and Development Center, Schenectady, NY (United States)
An approach was developed for achieving a low electrochemical corrosion potential (ECP) on structural materials exposed to high-temperature water, even without the addition or presence of reducing species such as hydrogen (H{sub 2}). This approach uses highly insulating coatings (e.g., yttria-stabilized zirconia [YSZ]) on structural materials to restrict the oxygen (O{sub 2}) transport rate to the metal surface while simultaneously preventing formation of a differential aeration crevice cell because of its highly insulating character. Initial experimental data on type 304 stainless steel (SS[UNS 30400]) coated by air plasma spray showed ECP of YSZ-coated type 304 SS remained at {approx} {minus}0.5 V{sub SHE} in 288 C water containing up to 200 ppb O{sub 2} and no H{sub 2}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 305356
- Journal Information:
- Corrosion, Journal Name: Corrosion Journal Issue: 12 Vol. 54; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
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