Mechanism and effectiveness of inhibitors for SCC in a caustic environment

Book · Sun Dec 31 00:00:00 EST 1995

OSTI ID:203814

Lumsden, J B; Jeanjaquet, S L ^[1]; Paine, J P.N.; McIlree, A ^[2]

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1. Rockwell Science Center, Thousand Oaks, CA (United States)
2. Electric Power Research Inst., Palo Alto, CA (United States)

The effectiveness of inhibitors for stress corrosion cracking (SCC) of alloy 600 steam generator tubes exposed to caustic solutions was evaluated. Mill annealed material was exposed as C-rings to solutions at 320 C at open circuit and while polarized at 100, 150, and 200 mV above the corrosion potential. In pure 50% caustic and caustic with boric acid, specimens polarized at 150 and 200 mV cracked through-wall in less than two days. Certain Ti compounds, cerium salts, and Zn compounds increased resistance to SCC. An evaluation of results from surface analysis and from electrochemical measurements provide a mechanistic explanation for the beneficial effects.

• OSTI ID: 203814
• Report Number(s): CONF-950816-; ISBN 1-877914-95-9; TRN: 96:009780
• Resource Relation: Conference: 7. international symposium on environmental degradation of materials in nuclear power plants: water reactors, Breckenridge, CO (United States), 6-10 Aug 1995; Other Information: PBD: 1995; Related Information: Is Part Of Seventh international symposium on environmental degradation of materials in nuclear power systems -- Water reactors: Proceedings and symposium discussions. Volume 1; Airey, G.; Andresen, P.; Brown, J. [eds.] [and others]; PB: 664 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS
CORROSION INHIBITORS
PERFORMANCE
INCONEL 600
STRESS CORROSION
CRACK PROPAGATION
PWR TYPE REACTORS
STEAM GENERATORS
TUBES
SODIUM HYDROXIDES
CORROSIVE EFFECTS
SODIUM CARBONATES
MITIGATION
TITANIUM
ZINC
EXPERIMENTAL DATA
ADDITIVES