Passivity of AlCrFeMnTi and AlCrFeCoNi high–entropy alloys in Hanks’ solution

Authors

• Ridwan Sakidja, Missouri State UniversityFollow
• Ayoub Tanji, Université Laval
• Rui Feng, Tickle College of Engineering
• Zongyang Lyu, Tickle College of Engineering
• Peter K. Liaw, Tickle College of Engineering
• Hendra Hermawan, Université Laval

Abstract

The present work studies the passivation characteristic and corrosion resistance of Al20Cr5Fe50Mn20Ti5 and Al7Cr23.26Fe23.26Co23.26Ni23.26 high–entropy alloys in Hanks’ solution at 37 °C, in view of potential biomedical applications. The Al7Cr23.26Fe23.26Co23.26Ni23.26 possesses a higher corrosion resistance than Ti-6Al-4 V alloy, mainly due to the formation of a stable p–type passive film composed of Cr(OH)3, Cr2O3, CoO, Co3O4, and Ni(OH)2, leading to low vacancy concentration and limited ion conductivity. The Al20Cr5Fe50Mn20Ti5 exhibits an n–type passive film composed of Fe2O3, Fe(OH)3, TiO2, and MnO2 that promotes chloride ions adsorption and diffusion–controlled corrosion, while its microstructural precipitates allowed a selective dissolution.

Department(s)

Physics, Astronomy, and Materials Science

Document Type

Article

DOI

10.1016/j.corsci.2022.110828

Keywords

AFM, Alloy, EIS, Modeling studies, Passive films, Passivity, Polarization

Publication Date

1-1-2023

Recommended Citation

Sakidja, Ridwan; Tanji, Ayoub; Feng, Rui; Lyu, Zongyang; Liaw, Peter K.; and Hermawan, Hendra, "Passivity of AlCrFeMnTi and AlCrFeCoNi high–entropy alloys in Hanks’ solution" (2023). Faculty Scholarship. 690.
https://bearworks.missouristate.edu/articles00/690

Journal Title

Corrosion Science