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A total of 1050 specimens of 46 different copper alloys were exposed in the Pacific Ocean at two depths, 760 and 1830 m, for periods of time varying from 123 to 1064 days in order to determine the effects of deep-ocean environments on their corrosion resistance.
Most of the copper-base alloys corroded uniformly and their corrosion rates were low, 25 μm per year or less after one year at a depth of 760 m and after two years at a depth of 1830 m. A few of the alloys containing zinc, aluminum or silicon were attacked by parting corrosion. They were not susceptible to stress corrosion cracking. Only the mechanical properties of the alloys attacked by parting corrosion were adversely affected.
The aggressiveness of the seawater and of the bottom sediments on the copper alloys was about the same, except for the copper-nickel alloys, where the bottom sediments were less aggressive.
corrosion, materials, hydrospace, copper, copper alloys, ocean environments, corrosion resistance
Metallurgist, Naval Civil Engineering Laboratory, Port Hueneme, Calif.