Revealing different corrosion behaviors of Cr-containing refractory high-entropy alloy coatings in static liquid lead–bismuth eutectic
Jiuguo Deng, Wei Zhang, Xi Qiu, Mingyang Zhou, Yi Zhou, Ning Liu, Jijun Yang
Abstract
Five Cr-containing refractory high-entropy alloy (RHEA) coatings were prepared by magnetron sputtering technology and then exposed to static lead–bismuth eutectic to investigate their oxidation resistances at 550–650 °C. The obtained TiNbCrMoV coating had a BCC crystalline structure, while the others were amorphous. The TiNbCrMoV coating exhibited the best corrosion resistance, followed by TiNbZrCrV and CrNbZrMoV coatings, and finally TiCrZrMoV and TiNbZrMoCr coatings. The excellent corrosion resistance of TiNbCrMoV coating was mainly attributed to the presence of grain boundaries which provided the diffusion channels of atoms, thus forming a protective oxide layer. Possible mechanisms were proposed to help understand the corrosion behaviors of these RHEA coatings.