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01141 CREVICE CORROSION STABILIZATION AND REPASSIVATION BEHAVIOR OF ALLOYS 625 AND 22

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Product Number: 51300-01141-SG
ISBN: 01141 2001 CP
Author: B. A. Kehler, G.O. Ilevbare and J.R. Scully
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The crevice corrosion resistance of alloys 625 (UNS No.N06625) and 22 (UNS No.N06022) was compared on the basis of critical potentials for stabilization, and repassivation as well as crevice stabilization rates. The effects of temperature, anion composition in 5 M LiCl based electrolytes, and oxide aging were examined. Repassivation potentials measured at 95°C were similar for both alloys and were not greatly influenced by bulk electrolyte composition, pH, or accumulated anodic charge. However, a decrease in temperature raised repassivation potentials for alloy 22 in comparison to 625. Crevice corrosion stabilization properties of alloys 625 (UNS No.N06625) and 22 (UNS No.N06022) were clearly influenced by temperature and electrolyte composition but not bulk solution pH. Crevice stabilization occurred at more active potentials in 5 M LiCl electrolytes with a molar ratio of chloride to total oxyanions...Key Words: alloy 22 alloy 625, crevice corrosion, chloride, critical crevice potential, critical repassivation potential, cyclic potentiodynamic polarization
The crevice corrosion resistance of alloys 625 (UNS No.N06625) and 22 (UNS No.N06022) was compared on the basis of critical potentials for stabilization, and repassivation as well as crevice stabilization rates. The effects of temperature, anion composition in 5 M LiCl based electrolytes, and oxide aging were examined. Repassivation potentials measured at 95°C were similar for both alloys and were not greatly influenced by bulk electrolyte composition, pH, or accumulated anodic charge. However, a decrease in temperature raised repassivation potentials for alloy 22 in comparison to 625. Crevice corrosion stabilization properties of alloys 625 (UNS No.N06625) and 22 (UNS No.N06022) were clearly influenced by temperature and electrolyte composition but not bulk solution pH. Crevice stabilization occurred at more active potentials in 5 M LiCl electrolytes with a molar ratio of chloride to total oxyanions...Key Words: alloy 22 alloy 625, crevice corrosion, chloride, critical crevice potential, critical repassivation potential, cyclic potentiodynamic polarization
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