电解质对Fe23Mn5Cr合金钝化膜的结构及耐蚀性能影响
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摘要
运用电化学阳极钝化技术对Fe23Mn5Cr合金分别于50%HNO_3溶液及1.0 mol/L Na_2SO_4溶液中进行表面钝化时效5 h处理;利用X射线光电子能谱(XPS)表面分析技术及电位衰减曲线和阳极极化曲线测试技术研究电解质对Fe23Mn5Cr合金钝化时效改性膜的组成结构与耐蚀性能的影响.结果表明:Fe23Mn5Cr合金在1 mol/L Na_2SO_4溶液中钝化5 h所得钝化膜主要由Fe_2O_3、FeO及MnO组成,在50%HNO_3溶液中钝化5 h所得钝化膜主要由Cr_2O_3和Fe_2O_3组成.与1.0 mol/L Na_2SO_4溶液中的钝化时效改性膜相比,50%HNO_3溶液中钝化时效改性膜的Cr_2p_(3/2)峰强度增强,Mn_2p_(3/2)峰强度减弱,Mn氧化物溶解,具有保护性的Cr氧化物富集,耐蚀性能显著提高,其电位衰减时间由586 s延长至8 782 s,阳极极化曲线呈现自钝化.
The electrochemical anodic aging was used to modify Fe23 Mn5 Cr alloy in 50%HNO_3 solution and 1.0 mol/L Na_2SO_4 solution for 5 h. The constitution and corrosion resistance of passive film formed on the Fe23 Mn5 Cr alloy were investigated by using X-ray photoelectron spectroscopy, potential decline curve and anodic polarization cures.The results indicate that the passive film formed on the Fe23 Mn5 Cr alloy in 1.0 mol/L Na_2SO_4 solution is consisted of Fe_2O_3, FeO and MnO. The passive film formed in 50%HNO_3 solution was consisted of Cr_2O_3 and Fe_2O_3. Compared with the passive film formed in 1.0 mol/L Na_2SO_4 solution, the relative intensity of the Cr2 p_(3/2 ) passive film formed in 50%HNO_3 solution is increased, and the relative intensity of the Mn2 p_(3/2) is decreased. Anodic aging in 50%HNO_3 solution oxidiationbrings depletion of the Mn oxide and enrichment of the Cr oxide,which leds to an improved corrosion resistance of the Fe23 Mn5 Cr alloy. The potential decline time of the modified Fe23 Mn5 Cr alloy is prolonged from 586 s to 8 782 s,and the anodic polarization cures are changed into self-passivation.
The electrochemical anodic aging was used to modify Fe23 Mn5 Cr alloy in 50%HNO_3 solution and 1.0 mol/L Na_2SO_4 solution for 5 h. The constitution and corrosion resistance of passive film formed on the Fe23 Mn5 Cr alloy were investigated by using X-ray photoelectron spectroscopy, potential decline curve and anodic polarization cures.The results indicate that the passive film formed on the Fe23 Mn5 Cr alloy in 1.0 mol/L Na_2SO_4 solution is consisted of Fe_2O_3, FeO and MnO. The passive film formed in 50%HNO_3 solution was consisted of Cr_2O_3 and Fe_2O_3. Compared with the passive film formed in 1.0 mol/L Na_2SO_4 solution, the relative intensity of the Cr2 p_(3/2 ) passive film formed in 50%HNO_3 solution is increased, and the relative intensity of the Mn2 p_(3/2) is decreased. Anodic aging in 50%HNO_3 solution oxidiationbrings depletion of the Mn oxide and enrichment of the Cr oxide,which leds to an improved corrosion resistance of the Fe23 Mn5 Cr alloy. The potential decline time of the modified Fe23 Mn5 Cr alloy is prolonged from 586 s to 8 782 s,and the anodic polarization cures are changed into self-passivation.
引文
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[2]GEBHARDT T,MUSIC D,KOSSMANN D,et al.Gebhardt T,Music D,Ekholm M,etal.Influence of chemical composition and magnetic effects on the elastic properties of fcc Fe-Mn alloys[J].Acta Materialia,2011,59(4):3145.
[3]CASTELETTI L C,LOMBARDI N A,TOTTEN G E,etal.Use of Fe-31Mn-7.5Al-1.3Si-0.9C Alloy for fabrication of Resistive Elements [J].Journal of ASTM International,2010,7(2):1-4.
[4]ZHANG Y S ,ZHU X M.Effect of Alloying Elements on the Electrochemical Polarization Behavior and Passive Film of Fe-Mn Base Alloys in Different Aqueous Solution[J].Corrosion Science,2004,46(4):853–876.
[5]TUAN Y H,WANG C S,TSAI C Y,et al.Corrosion behaviors of austenitic Fe–30Mn–7Al– xCr–1C alloys in 3.5% NaCl solution[J].Materials Chemistry & Physics,2009,114(2):595-598.
[6]ZHU X M,LIU M,ZHANG Y S.Electrochemistry and surface investigations of anodically passivated layer formed on Fe-Mn-Al-Cr alloy in Na2SO4 solution[J].Corrosion Engineering ,Science and Technology,2007,42(1):22-28.
[7]LIU M,ZHU X M,ZHANG Y S.Effect of initial transpassive treatment on properties of passive film formed on Fe-Mn-Al-Cr alloy[J].Corrosion Engineering,Science and Technology,2013,48(1):36-43.
[8]朱雪梅,解雪,张琳,等.钝化时间对Fe30Mn9Al合金钝化膜半导体特性的影响[J].稀有金属材料与工程,2017,46(7):1972-1976.
[9]MACDONALD D D.The history of the Point Defect Model for the passive state:A brief review of film growth aspects[J].Electrochimica Acta,2011,56(4):1761-1772.
[10]KIRCHHEIM R,HEINE B,HOFMANN S,et al.Compositional changes of passive films due to different transport rates and preferential dissolution[J].Corrosion Science,1990,31(90):573-578.