Potential of a Thin-Film Cell for assessing the Sensitivity of Nickel-Base Alloys to Crevice Corrosion

Nickel-base alloy 825 is prone to crevice corrosion in seawater. A modified and updated thin-layer cell was used to mimic crevice corrosion, and a new approach to monitor the evolution of the material behavior was developed. The corrosion potential, polarization resistance, and electrolyte resistance were demonstrated to be good indicators to follow the different stages of the crevice-corrosion process. The results were discussed in regard with the cathodic process kinetic. The different tested conditions justify the interest of the methodology developed for this set-up.

Automated summary

Nickel-base alloy 825 is susceptible to crevice corrosion in seawater. A modified thin-layer cell was used to simulate crevice corrosion and a new approach for monitoring material behavior was developed. Corrosion potential, polarization resistance, and electrolyte resistance were found to be effective indicators for tracking different stages of the crevice corrosion process. The results were discussed in terms of cathodic process kinetics. The tested conditions validate the importance of the developed methodology for this setup.