添加Gd对AM60镁合金耐腐蚀性能的影响
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摘要
采用区域凝固法制备AM60和AM60Gd1.0镁合金。采用析氢实验和电化学实验研究了添加Gd对AM60合金的显微结构和在0.9%(质量分数) NaCl溶液和模拟人体体液中的耐腐蚀性能的影响。结果表明,AM60合金由α-Mg相和β-Mg_(17)Al_(12)相组成,Gd的添加促进了Al_2Gd相的生成;同时提高了合金的腐蚀电位,降低了腐蚀电流密度。在0.9%NaCl溶液中,AM60合金和AM60Gd1.0合金的阻抗谱均由一个高频容抗弧和一个低频感抗弧组成;在模拟人体体液中,两种合金的阻抗谱由两个高频容抗弧组成;在同一浸泡时间下,AM60Gd1.0合金阻抗谱的半径大于AM60合金的。Gd的添加提高了AM60合金的耐蚀性。
AM60 and AM60Gd1.0 magnesium alloys were prepared by zone solidification purifying method. Microstructures and phase compositions of the alloys were analyzed. The corrosion resistance of the alloys in 0.9%(mass fraction) NaCl solution and simulated body fluid were examined by hydrogen evolution test and electrochemical test. Results show that AM60 alloy composed of α-Mg and β-Mg_(17)Al_(12),while Al_2Gd was found for AM60Gd1.0. The corrosion rate of AM60Gd1.0 alloy was lower than that of AM60 alloy. The E_(corr) of AM60Gd1.0 alloy was much positive than that of AM60 alloy due to the addition of 1.0%Gd. The I_(corr) of AM60Gd1.0 alloy was smaller than that of AM60 alloy. In NaCl solution, the EIS curves of AM60 and AM60Gd1.0 alloy all composed of a capacitive loop and an inductive loop. In SBF,the EIS curves of the alloys composed of two capacitive loops. Being soaked in NaCl solution for the same period of time, the radius of the EIS curve of AM60Gd1.0 alloy was larger than that of AM60 alloy.
AM60 and AM60Gd1.0 magnesium alloys were prepared by zone solidification purifying method. Microstructures and phase compositions of the alloys were analyzed. The corrosion resistance of the alloys in 0.9%(mass fraction) NaCl solution and simulated body fluid were examined by hydrogen evolution test and electrochemical test. Results show that AM60 alloy composed of α-Mg and β-Mg_(17)Al_(12),while Al_2Gd was found for AM60Gd1.0. The corrosion rate of AM60Gd1.0 alloy was lower than that of AM60 alloy. The E_(corr) of AM60Gd1.0 alloy was much positive than that of AM60 alloy due to the addition of 1.0%Gd. The I_(corr) of AM60Gd1.0 alloy was smaller than that of AM60 alloy. In NaCl solution, the EIS curves of AM60 and AM60Gd1.0 alloy all composed of a capacitive loop and an inductive loop. In SBF,the EIS curves of the alloys composed of two capacitive loops. Being soaked in NaCl solution for the same period of time, the radius of the EIS curve of AM60Gd1.0 alloy was larger than that of AM60 alloy.
引文
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[3]Zhou X H,Wei Z L,Chen Q R,et al.Corrosion behavior of die-cast Mg-9Al magnesium alloy with RE addition[J].Corros.Prot.,2006,27:487(周学华,卫中领,陈秋荣等.含稀土耐蚀Mg-9Al铸造镁合金腐蚀行为研究[J].腐蚀与防护,2006,27:487)
[4]Wu G H,Fan Y,Gao H T,et al.The effect of Ca and rare earth elements on the microstructure,mechanical properties and corrosion behavior of AZ91D[J].Mater.Sci.Eng.,2005,A408:255
[5]Luo T J,Yang Y S,Li Y J,et al.Influence of rare earth Y on the corrosion behavior of as-cast AZ91 alloy[J].Electrochim.Acta,2009,54:6433
[6]Mert F,Blawert C,Kainer K U,et al.Influence of cerium additions on the corrosion behaviour of high pressure die cast AM50 alloy[J].Corros.Sci.,2012,65:145
[7]Zhang Q,Li Q A,Wen J B,et al.Effects of Gd on corrosion resistance of magnesium alloy AZ81[J].Total Corros.Control,2007,21(6):21(张清,李全安,文九巴等.Gd对镁合金AZ81耐腐蚀性能的影响[J].全面腐蚀控制,2007,21(6):21)
[8]Zhao M C,Liu M,Song G L,et al.Influence of theβ-phase morphology on the corrosion of the Mg alloy AZ91[J].Corros.Sci.,2008,50:1939
[9]Bai L J,Zhang H,Yuan Y,et al.Influence ofβ-Mg17Al12phase content on corrosion behavior of AZ9l magnesium alloy[J].J.Xi’an Univ.Technol.,2011,27:31(白力静,张华,袁颖等.β-Mg17Al12相含量对AZ91镁合金腐蚀行为的影响[J].西安理工大学学报,2011,27:31)
[10]Chen Z,Li Q A,Liu W J,et al.Application and development of gadolinium in heat resistant magnesium alloy[J].Foundry,2013,62:33(陈志,李全安,刘文健等.Gd在耐热镁合金中的应用及研究进展[J].铸造,2013,62:33)
[11]Xu Y,Teng Y J,Zhang Y,et al.Investigation of improving corrosion resistance of magnesium alloys by permeating rare earths[J].Chin.Rare Earths,2004,25(5):13(许越,滕玉洁,张勇等.AZ91镁合金稀土表面改性的研究[J].稀土,2004,25(5):13)
[12]Wen S P,Xing Z B,Huang H,et al.The effect of erbium on the microstructure and mechanical properties of Al-Mg-Mn-Zr alloy[J].Mater.Sci.Eng.,2009,A516:42
[13]Arrabal R,Pardo A,Merino M C,et al.Effect of Nd on the corrosion behaviour of AM50 and AZ91D magnesium alloys in 3.5wt.%NaCl solution[J].Corros.Sci.,2012,55:301
[14]Song G L,Song S Z.Corrosion behaviour of pure magnesium in a simulated body fluid[J].Acta Phys.-Chim.Sin.,2006,22:1222(宋光铃,宋诗哲.镁在人体模拟液中的腐蚀行为[J].物理化学学报,2006,22:1222)
[15]He M F,Liu L,Wu Y T,et al.Corrosion properties of surface-modified AZ91D magnesium alloy[J].Corros.Sci.,2008,50:3267
[16]Baril G,Pébère N.The corrosion of pure magnesium in aerated and deaerated sodium sulphate solutions[J].Corros.Sci.,2001,43:471