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The use of nitrogen to improve the corrosion resistance of FeCrNiMo alloys for the chemical process industries
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1987
Year
Materials ScienceMaterials EngineeringChemical EngineeringSolid Solution AdditionsEngineeringCorrosion ProtectionChemical Process IndustriesCorrosionMechanical EngineeringMetallurgical ProcessCorrosion InhibitionNitrogen AdditionsFerrous MetallurgyCorrosion ResistanceMicrostructureAlloys
The addition of 0.1 to 0.25 wt% nitrogen to austenitic alloys has been shown to enhance resistance to localized corrosion in oxidizing chloride and reducing acid solutions. Further tests of FeCrNiMo alloys assess the effects of nitrogen additions on: mechanical properties, chloride and caustic stress corrosion cracking resistance, passivation characteristics, and general corrosion rates in various acid, alkali, and salt solutions pertinent to the chemical process industries. The precipitation of chromium-rich secondary phases was retarded by solid solution additions of 0.1 to 0.25 wt% nitrogen. The corrosion resistance of FeCrNiMoN alloys in the welded condition was improved by using shield-gas mixtures of argon and 2.5 to 5.0 wt% nitrogen.