Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5440068 | Corrosion Science | 2017 | 48 Pages |
Abstract
The present work investigates the influence of Al-content and potential-scan-rate on stable/metastable pitting of Al xCoCrFeNi high-entropy alloys in a 3.5Â wt.% NaCl solution. The increased Al content causes the volume fraction of the Cr-depleted phase to increase, resulting in thicker/dispersive passive films that degrade the localized corrosion resistance. The varied stable/metastable pitting behavior under different potential scan rates indicates that pit generation is influenced by the properties of passive films and the interactions between chloride ions and the active sites. Furthermore, a mean-field theory is employed to predict the scan-rate dependent, power-law distribution of current fluctuations.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yunzhu Shi, Bin Yang, Xie Xie, Jamieson Brechtl, Karin A. Dahmen, Peter K. Liaw,