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Crevice corrosion kinetics of nickel alloys bearing chromium and molybdenum

Authors
Journal
Electrochimica Acta
0013-4686
Publisher
Elsevier
Publication Date
Volume
76
Identifiers
DOI: 10.1016/j.electacta.2012.04.157
Keywords
  • Nickel Alloys
  • Crevice Corrosion
  • Repassivation
  • N06022
  • Chloride

Abstract

Abstract The crevice corrosion kinetics of alloys C-22, C-22HS and HYBRID-BC1 was studied in several chloride solutions at 90°C. The crevice corrosion resistance of the alloys increased with PREN (Pitting Resistance Equivalent Number), which is mainly affected by the Mo content in the alloys. The crevice corrosion kinetics of the three alloys was analyzed at potentials slightly higher than the repassivation potential. Crevice propagation was controlled by ohmic drop in the more dilute chloride solutions, and by charge transfer in the more concentrated chloride solutions. Ohmic drop was not a necessary condition for crevice corrosion to occur.

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