The Effect of Boron on the Corrosion Resistance of the High Entropy Alloys Al[sub 0.5]CoCrCuFeNiB[sub x]

Abstract

High entropy alloys are a newly developed family of multicomponent alloys that consist of various major alloying elements, including copper, nickel, aluminum, cobalt, chromium, iron, and others. Each element in the alloy system is present at between 5 and 35atom%35atom% . A high entropy alloy has numerous beneficial mechanical, magnetic, and electrochemical characteristics. This investigation discusses the corrosion resistance of the Al0.5CoCrCuFeNiBxAl0.5CoCrCuFeNiBx alloys with various amounts of added boron. Surface morphological and chemical analyses verified that the addition of boron produced CrCr , FeFe , and CoCo borides. Therefore, the fraction of CrCr outside borides precipitates was scant. The anodic polarization curves and electrochemical impedance spectra of the Al0.5CoCrCuFeNiBxAl0.5CoCrCuFeNiBx alloys, obtained in 1N1N H2SO4H2SO4 aqueous solution, clearly reveal that the general corrosion resistance decreases as the concentration of boron increases.