Postulated relationships between bulk chemistry, crevice concentration, and corrosion processes
- Westinghouse Electric Corp., Madison, PA (United States)
This paper describes interactions between deposited corrosion products, low and high-solubility solutes, and volatiles in tubesheet and tube support plate crevices, and in free-span deposits. Schematics showing these interactions are used to explain why corrosion has occurred in certain steam generator locations but been absent from others. Of particular importance are the effects of precipitation of low-solubility species and of volatilization of acidic species in promoting heterogeneity in the chemical and physical characteristics of crevices and deposits. The reduction in the crevice porosity caused by the precipitation of low-solubility species is shown to affect the progression of tube support plate crevice corrosion to a greater degree than tubesheet crevice corrosion. Volatilization of acidic species causes preferential accumulation of these acids in lower temperature crevice locations, where they are less capable of interacting with more alkaline environments which may accumulate on the tube surface.
- OSTI ID:
- 409760
- Report Number(s):
- CONF-9510292-; ISBN 1-57570-008-4; TRN: 97:000762
- Resource Relation:
- Conference: Improving the understanding and control of corrosion on the secondary side of steam generators, Airlie, VA (United States), 9-13 Oct 1995; Other Information: PBD: 1996; Related Information: Is Part Of Control of corrosion on the secondary side of steam generators. Proceedings; Staehle, R.W. [ed.] [Univ. of Minnesota, Minneapolis, MN (United States)]; Gorman, J.A. [ed.] [Dominion Engineering, McLean, VA (United States)]; McIlree, A.R. [ed.] [Electric Power Research Inst., Palo Alto, CA (United States)]; PB: 814 p.
- Country of Publication:
- United States
- Language:
- English
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