Improved resistance of nickel-based alloy UNS N06625 to crevice corrosion in natural and chlorimted seawater has been demonstrated by the use of two different surface enhancement techniques. The most successful technique employed commercial eleetropolishing. 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 SEIVVEDSsurface analyses are discussed.
Keywords: crevice corrosion, electropolishing, nickel-based alloy, cerium treatment, seawater, chlorination