Abstract
Iron base boride cermets show excellent mechanical properties, wear resistance, and high temperature properties. Recently, these cermets with oxide surface layer exhibited excellent corrosion resistance in a molten Al alloy. In this study, we investigated the relationship between structure of the oxide layer and corrosion resistance in a molten Al alloy for the cermet with the composition of 5%B-42.7%Mo-10.2%Cr-2.85%Ni-bal.Fe(%: mass%).Thickness of the oxide layer increased with increasing the temperature and holding time. The cermet with the oxide layer formed from 973 to 1073 K exhibited excellent corrosion resistance. XRD and EDS analysis results indicated that the oxide layer consisted of two phase: an outer one of the Fe2O3 and an inner one of the (Fe, Cr)MoO4 which might contain B. After the corrosion resistance test in a molten Al alloy, the boride surface maintained the inner oxide layer. These results indicated that the inner oxide had excellent corrosion resistance against the molten Al alloy due to the tight bonding to the cermet and the formation of the dense oxide.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
