Improved resistance of nickel-based alloy UNS N06625 to crevice corrosion in natural and chlorinated seawater has been demonstrated by the use of two different surface enhancement techniques. The most successful technique employed commercial electropolishing. While surface treatment with cerium was shown to be beneficial, the resistance imparted was not as great as that afforded by electropolishing. The results of long-term crevice corrosion testing, supported by electrochemical testing and SEM/EDS surface analyses are discussed.

Subject
Pipe surfaces, Materials, Piping, Vinyls, Cerium, Chlorinated seawater, Fittings, Seawater, Crevices, Corrosion attacks, Surface analysis, Crevice corrosion, Corrosion resistance
Keywords:
crevice corrosion, electropolishing, nickel-based alloy, cerium treatment, seawater, chlorination
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1999
Association for Materials Protection and Performance (AMPP)
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