The　microstructure　and　oxidation　behavior　of　Fe-B　alloys　have　been　investigated.　Oxide　scale　cross-sectional　microstructures　oxidized　at　1073　K　for　100　h　have　been　studied.　EPMA　investigations　show　that　B2O3-SiO2　oxides　accumulates　in　the　inner　oxide　layer　which　improves　the　oxidation　behavior　and　oxide　layer　adhesion　considerably.　Cyclic　oxidation　kinetics　data　indicates　that　Fe-B　3.08　wt.%　alloy　presents　the　best　oxidation　resistance.　The　formation　of　diffusion　zone　in　the　Fe-B　alloys　indicate　that　the　oxidation　of　the　Fe2B　boride　is　controlled　by　boron　diffusion.　The　diffusion　zone　increases　with　time　and　reaches　a　maximum　width　of　60-65　mu　m.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.