Corrosion resistance of rapidly solidified Fe36Co36Zr7Si10B11 and Fe33.5Co33.5Nb7Si15B11 alloys

Purpose - Amorphous and nanocrystalline FeCo-based alloys present excellent soft magnetic properties and high Curie TC temperatures. At ambient temperatures, these alloys are subject to electrochemical corrosion, which causes degradation of their magnetic properties. This paper seeks to characterize the microstructure and evaluate the corrosion resistance of Fe36Co36Zr7Si10B11 and Fe33.5Co33.5Nb7Si15B11 alloys.Design methodology approach - These alloys are solidified at different cooling rates.Findings - The corrosion resistance, which is found to depend on the microstructure, decreases as the cooling rate increases in the interval of 50-150°C.Originality value - Builds on existing knowledge of the microstructure and corrosion resistance of Fe36Co36Zr7Si10B11 and Fe33.5Co33.5Nb7Si15B11 alloys.