Crevice corrosion kinetics of nickel all

The crevice corrosion kinetics of alloys C-22, C-22HS and HYBRID-BC1 was studied in several chloride solutions at 90 ◦ C. The objective was to investigate the relationship between the Pitting Resistance Equivalent Number (PREN) of the alloys and their resistance to crevice corrosion, which is influenced primarily by the molybdenum content. Methodologically, the study analyzed the crevice corrosion kinetics at potentials slightly higher than the repassivation potential. Results indicated that the crevice corrosion resistance increased with higher PREN values. The propagation of crevice corrosion was found to be controlled by ohmic drop in less concentrated chloride solutions, while in more concentrated solutions, charge transfer dominated. Notably, it was observed that ohmic drop was not a necessary condition for the initiation of crevice corrosion, indicating other electrochemical factors at play. This research provides valuable insights into the behavior of nickel alloys in chloride environments, which is crucial for industries relying on these materials. It contributes to understanding the conditions that affect corrosion kinetics and alloy performance in practical applications.