Application of thermal spray coatings for 304 SS SCC mitigation in high temperature water
- GE Corporate Research and Development Center, Schenectady, NY (United States)
The thermal spray coating technique was applied to produce the catalytic or insulated protective coatings on 304 stainless steel (SS) surface. The electrochemical corrosion potential (ECP) response of such coatings in high temperature water under various water chemistry conditions were evaluated. The ECP results clearly demonstrated that the catalytic coatings (CC) produced with various alloy powders containing small amounts of Pd responded fully catalytically in the presence of the stoichiometric excess hydrogen, showing a ECP value well below the intergranular stress corrosion cracking (IGSCC) protection potential ({minus}230 mV{sub she}). Furthermore, the insulated protective coating (IPC) layer created with a powder of yttria-stabilized zirconia (YSZ) restricted the oxidant transport rate to the metal surface, and the ECP remained at <{minus}300 mV{sub she} in 288 C water containing to 200--300 ppb oxygen (O{sub 2}) and no hydrogen (H{sub 2}).
- OSTI ID:
- 351829
- Report Number(s):
- CONF-980316--
- Country of Publication:
- United States
- Language:
- English
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