Superior anticorrosion performance of crystal-amorphous FeMnCoCrNi high-entropy alloy

In order to explore metal material with better corrosion resistance, this work presented a new crystal-amorphous FeMnCoCrNi high entropy alloy (HEA) mode as the mixture of nanocrystalline and amorphous shell fabricated by magnetron sputtering technique. Due to the wide and remarkable Cr-enrichment of amorphous shell, which provides higher driving force and diffusion rate for Cr atom, the crystal-amorphous FeMnCoCrNi HEA exhibits strong passivation behavior because of the formed passive layer about 40 nm thick. The corrosion current density of the crystal-amorphous FeMnCoCrNi HEA is about 0.147 nA.cm (-2) that effectively inhibit pitting corrosion, indicating the superior anticorrosion performance. Then, the crystal-amorphous FeMnCoCrNi HEA presented herein provides a new mode for developing advanced materials with outstanding anticorrosion ability. (C)& nbsp;2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Automated summary

This study presents a new crystal-amorphous FeMnCoCrNi high entropy alloy mode fabricated by magnetron sputtering technique, which exhibits strong passivation behavior due to the formed passive layer. The corrosion current density of this alloy is about 0.147 nA·cm(-2), effectively inhibiting pitting corrosion. This research provides a new approach for developing advanced materials with outstanding anticorrosion performance.