ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Corrosion behavior of Al₁₂Cr₁₂Fe₃₅Mn₂₁Ni₂₀ high entropy alloy in different acidic media

Lamiaa Z. Mohamed, Mohamed A. H. Gepreel, and Aliaa Abdelfatah

Mining, Petroleum and Metallurgical Engineering Department, Faculty of Engineering, Cairo University, Cairo, Egypt

E-mail: lamiaa.zaky@cu.edu.eg

Received: 2 May 2021  Accepted: 14 July 2021

Abstract:

High entropy alloys (HEAs) show demonstrated unique and attractive properties for various engineering applications. Significant advancements in HEAs have revealed promising properties as ductility, toughness, hardness, and resistance to corrosion. The HEAs corrosion behavior in aqueous solutions attracted the interest recently of researchers to explore the range of its possible applications. The new Al₁₂Cr₁₂Fe₃₅Mn₂₁Ni₂₀ high entropy alloy (HEA) is investigated as a potential corrosion-resistant alloy in acidic media. Cast Al₁₂Cr₁₂Fe₃₅Mn₂₁Ni₂₀ HEA was cold rolled up to 70% reduction then solution treatment. The micro-hardness, X-ray diffraction, and microstructure of the Al₁₂Cr₁₂Fe₃₅Mn₂₁Ni₂₀ HEA were investigated after solution treatment. The electrochemical experiments were performed at room temperature with two concentrations, 0.5 M and 1 M, in both NaCl and H₂SO₄ solutions. The potentiodynamic response is used to calculate corrosion rates. In addition, for the various conditions, cyclic voltammetry was investigated. Surface characterization of corroded samples was provided using scanning electron microscopy and energy dispersive x-ray analyzer. The results demonstrate that the Al₁₂Cr₁₂Fe₃₅Mn₂₁Ni₂ HEA in NaCl has a good corrosion resistance especially in 1 M concentrations.

Keywords: Al12Cr12Fe35Mn21Ni20 HEA; High entropy alloys; Corrosion; Acidic media; X-ray diffraction; Microstructure

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01791-9

Chemical Papers 75 (12) 6265–6274 (2021)