Corrosion behavior of ternary Fe-15Cu-5Al alloy in pure oxygen at 1 000 ℃
The corrosion behavior of ternary Fe-15Cu-5Al (mole fraction,％) alloy was studied at 1 000 ℃ in 0.1 MPa pure oxygen.The Fe-rich alloy shows two parabolic oxidation stages,with a small increase of the parabolic rate constant from 1.9×109 to 4.1×109 g2/(cm4·s).The scale grown on the alloy is very complicated,with formation of overgrown nodules interspersed among bulky stratified scales.The nodules and the bulky stratified scales are always composed of an outer layer of CuFe2O4 and of an inner layer containing Fe2O3 and Fe3O4.Beneath the external scale of the nodules,there is an internal oxidation zone where iron oxide is mixed with copper metal.Furthermore,the base of the internal oxidation zone is characterized by a discontinuous aluminum-enriched layer of either Al2O3 or FeAl2O4.For the stratified scales,no internal oxidation zone is present beneath the innermost Al2O3 or FeAl2O4 layer.Aluminum depletion is present in advance of the internal oxidation front,while iron depletion is not observed.The corrosion feature of the ternary Fe-15Cu-5Al alloy is partly associated with that of the corresponding binary Fe-Cu and Fe-Al alloys.The peculiar scale microstructure observed is considered mainly as a consequence of the limited solubility of the iron and copper components in one another and of the monovariant system of the ternary Fe-15Cu-5Al alloy.
Fe-15Cu-5Al alloy ternary alloy corrosion behavior nodules
YANG Gan-lan XIANG Jun-huai ZHANG Wen-hua ZHAO Qiong BAI Ling-yun
School of Materials Science and Engineering,Jiangxi Science and Technology Normal University,Nanchan School of Materials Science and Engineering,Jiangxi Science and Technology Normal University,Nanchan
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）