The HVOF sprayed coatings of SUS316L stainless steel and Hastelloy C nickel-based alloy were studies with respect to corrosion behaviour in seawater. Corrosion took place at the small crack, which was formed by insufficient filling up of sprayed particles. The corrosion mechanism of the sprayed film was similar to the crevice corrosion. Some treatments for decrease of the crack resulted in considerable improvement of the corrosion resistance.

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