The U.S. Navy has been carrying out experiments to determine the susceptibility of copper-base machinery alloys to sulfide-induced corrosion. The direction of this research has been toward extremely low sulfide levels in natural seawater, and results have shown that copper-nickel (Cu-Ni) alloys are susceptible to pitting attack in the presence of 0.01PPM sulfide.(1) Results also showed that initiation of pitting and degree of attack appear to be dependent upon time of sulfide exposure and operating seawater velocity after exposure. The objective of this research task was to systematically evaluate effects of sulfide concentration in the range 0.007-0.25PPM, seawater velocity after sulfide exposure (0.5-5.3M/S), and duration of sulfide exposure (1-90 days) on the corrosive behavior of 90/10 and 70/30 Cu-Ni. The range of experimental variables was selected to allow projection of results to short time, high concentration sulfide incursions or continuous low level sulfide exposure.

Subject
Accelerated corrosion tests, Materials, Corrosion rate, Materials performance, Sulfide films, Corrosion initiation, Seawater, Corrosion attacks, Sulfide concentration, Corrosion data, Copper nickel alloys, Pitting, Sulfides
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1978
Association for Materials Protection and Performance (AMPP)
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