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This paper focuses on the utility of epoxy-type coatings for testing the crevice corrosion resistance of a variety of stainless type alloys in warm, natural seawater. Details of surface preparation, coating application and exposure to 30°C seawater for periods of up to six months are provided. Testing comprised exposure of UNS S31603, UNS N08367 and UNS S20910 in one or more of the following forms: pipe, sheet, welded plate. Results are discussed in terms of alloy resistance to crevice corrosion initiation and propagation. The attributes of coatings as a crevice former are reviewed. While alloy N08367 was clearly the most resistant to crevice corrosion initiation at coating sites, it suffered intense attack in some cases.
warm seawater, crevice corrosion, coatings, austenitic stainless steel
Senior Corrosion Scientist, LaQue Center for Corrosion Technology, Inc., Wrightsville Beach, NC