Environmental effects on intergranular stress corrosion cracking (GSCC) of sensitized stainless steel in high-temperature solutions: Final report

Technical Report · Sat Aug 01 04:00:00 EDT 1987

OSTI ID:6131375

Cragnolino, G; Szklarska-Smialowska, Z; Christman, T; Eghan, A K; Govindarajan, S; Lee, J K; Shim, S H

The effect of relevant environmental variables on the IGSCC of furnace sensitized AISI 304 stainless steel in dilute aqueous solutions has been studied at temperatures ranging from 100 to 275/sup 0/C using the slow strain rate technique. The significance of a critical potential above which IGSCC occurs (E/sub ISCC/) has been discussed on the basis of literature data for both the current normal operating BWR environment and that modified by the injection of hydrogen. The effect of pH on E/sub ISCC/ in solutions containing Na/sub 2/SO/sub 4/ and H/sub 2/SO/sub 4/ has been determined, as well as the effect on the IGSCC behavior of aqueous impurities such as chloride and sulfide, thiosulfate, cupric and lead ions. In addition, the role of low molecular weight carboxylic acids, such as formic, acetic and oxalic, has been evaluated in water over a wide range of dissolved oxygen concentrations. Finally, the effect of fluid flow velocity on the IGSCC has been studied using slow strain rate rests and ac impedance methods to determine the influence of oxide film properties on the initiation of intergranular cracks under various flowing conditions.

• Research Organization: Ohio State Univ., Columbus (USA). Dept. of Metallurgical Engineering; Electric Power Research Inst., Palo Alto, CA (USA)
• OSTI ID: 6131375
• Report Number(s): EPRI-NP-5364M; ON: TI87920553
• Country of Publication: United States
• Language: English

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ALLOYS
BWR TYPE REACTORS
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