Corrosion Resistance of Boride Base Cermets in a Molten Aluminum Alloy

Abstract

Al die-casting machine parts need excellent corrosion resistance in a molten Al alloy. In this study, we investigated the corrosion resistance of Mo₂NiB₂ and M0₂FeB₂ boride base cermets. The corrosion resistance of the boride base cermets was estimated by measuring the dimensional change after dipping in molten ADC-10 Al-Si-C alloy at 1023K for 36ks.
The boride base cermets had higher corrosion resistance than conventional materials, such as WC-10mass%Co, WC-15mass%Ni and SKD61 alloy tool steel.
The boride base cermets show good corrosion resistance with increasing their Mo/B atomic ratio and Cr content.
These results imply that boride base cermets are promising candidates for the Al die casting machine parts and molds.