CORROSION OF MATERIALS IN HYDROSPACE. PART 2 - NICKEL AND NICKEL ALLOYS
Abstract
A total of 635 specimens of 75 different nickel alloys were exposed at two different depths in the Pacific Ocean for periods of time varying from 123 to 1064 days to determine the effects of deep ocean environments on their corrosion resistance. Corrosion rates, types of corrosion, pit depths, effects of welding, stress corrosion cracking resistance, changes in mechanical properties and analyses of corrosion products of the alloys are presented. Of those alloys tested, the following were practically immune to corrosion: nickel- chromium-iron alloy 718; nickel-iron-chromium alloys, except 902; nickel- chromium-molybdenum alloys; nickel-cobalt-chromium alloy; nickel-chromium-iron- molybdenum alloys; nickel-chromium-cobalt alloy; and nickel-molybdenum-chromium alloy. Alloys attacked by uniform or general corrosion were the cast nickel- copper alloys; nickel-molybdenum-iron alloy; and nickel-molybdenum alloy. Alloys attacked by crevice or pitting corrosion were the nickels; wrought nickel-copper alloys; nickel-chromium-iron alloys except 718; nickel-iron-chromium alloys 902; nickel-tin-zinc alloy; nickel-beryllium alloy; nickel-chromium alloys; and nickel-silicon alloy. Corrosion resistance of welds in the nickel alloys, depends upon the selection of the proper welding electrodes. The nickel alloys were not susceptible to stress corrosion cracking. Corrosion products consisted of oxides, hydroxides, chlorides and oxychlorides. Mechanical properties of the alloys were not adversely affected in a significant way.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1967
- Accession Number
- AD0821256
Entities
People
- Fred M. Reinhart
Organizations
- Naval Facilities Engineering Service Center