Abstract
Isothermal oxidation behaviors of Ni-Fe(wt.％)and of the same alloy with additions of 10 and 15％Cr al-loys in the air at 800℃and 900℃and their anodic behaviors in aluminum electrolysis system at 800℃were evaluated.The composition morphologies of oxide scales were characterized by XRD,SEM,and EDS.Results show that the scales formed on Ni-Fe alloy at both temperatures consisted of an inner(Ni,Fe)3O4 layer and an outer Fe2O3 layer.For Ni-Fe-10Cr alloy,an external(Ni,Fe)3O4/Fe2O3 layers and an internal oxidation zone were formed at 800℃,while a continuous Cr2O3 layer forms at the internal oxidation zone/substrate interface at 900℃.A multilayer structure oxide of Cr2O3/(Ni,Fe,Cr)3O4/(Ni,Fe)3O4/Fe2O3 was formed on Ni-Fe-15Cr alloy at 800℃,while at 900℃the Fe2O3 becomes discontinuous disperses in the(Ni,Fe)3O4 layer close to the surface.Increases in oxidation temperature or Cr content for Ni-Fe-Cr alloys promote the growth of the inner Cr2O3 layer and simultaneously reduce Fe2O3 content.After 4 h of electrolysis at an anode current density of 0.25 A cm-2,the oxidation resistance of Ni-Fe-15Cr anode is superior to the Ni-Fe anode.
NETL
NSTL
维普
万方数据