Al-Zr-Nd合金在3.5%NaCl溶液中的腐蚀行为
Corrosion Behaviors of Al-Zr-Nd alloys in 3.5% NaCl Solution
摘 要
采用真空电弧熔炼的方法制备了Al-Zr-Nd合金。经500 ℃充分退火后,采用X射线衍射、电化学测试和金相显微分析等方法对合金的相组成及其在3.5%NaCl溶液中腐蚀行为进行了研究。结果表明,主相为铝固溶体的合金发生明显的钝化现象,与纯铝相似,但钝化区更短,腐蚀从点蚀开始并向基体铝扩展,出现选择性腐蚀; 其余合金不发生点蚀,表现为活性阳极溶解过程,腐蚀从缺陷和晶界处开始并扩展至易腐蚀相,导致易腐蚀相的选择性腐蚀,其中铝固溶相由于电位最负而最先腐蚀,其次是铝和钕组成的二元相,最后是铝和锆组成的二元相。
电化学
腐蚀行为
Al-Zr-Nd
electrochemistry
corrosion behavior
Abstract
Al-Zr-Nd alloys were prepared by arc melting and annealed at 500 ℃. The phase composition and corrosion behavior in 3.5% NaCl solution of the alloys were investigated by X-ray diffraction, metallurgical microscopy and electrochemical analysis. The results indicate that pitting corrosion occurred in the Al90Zr5Nd5 alloy which is mainly composed of Al solid solution, and expanded to Al substrate, resulting in selective corrosion. For other alloys, pitting corrosion was not observed, but the selective corrosion existed at defects, grain boundaries and easily corroded phases. Passivation was only observed in the procedure of anodic polarization of Al90Zr5Nd5 alloy. Al solid solution was priority dissolution and then the binary phases composed of Al and Nd due to galvanic corrosion, the corrosion resistance of the binary phases composed of Al and Zr was the highest.
中图分类号 TG174
所属栏目 试验研究
基金项目 国家自然科学基金(51061004);广西研究生科研创新计划(GXU11T32607)
收稿日期 2013/1/21
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备注陈红梅(1973-),教授,硕士,从事材料制备及性能研究,
引用该论文: CHEN Hong-mei,ZHAO Mao-mi,WANG Rong-cheng,OUYANG Yi-fang,ZHONG Xia-ping. Corrosion Behaviors of Al-Zr-Nd alloys in 3.5% NaCl Solution[J]. Corrosion & Protection, 2013, 34(12): 1072
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【2】DAVIS J R. Aluminium and aluminium alloys[M]. OH: ASM, Materials Park,1993.
【3】HATCH J E. Aluminum: Properties and physical metallurgy[M]. OH: ASM, Metals Park, 1984.
【4】刘静安, 谢水生. 铝合金材料的应用与技术开发[M].北京: 冶金工业出版社,2004.
【5】潘复生, 张丁非. 铝合金及应用[M].北京: 化学工业出版社,2006.
【6】POLMEAR I J. A trace element effect in alloys based on the aluminum-zinc-magnesium system[J]. Nature,1960,186:303-304.
【7】JAUKOVIC N, LALOVIC M. Effect of zirconium and lanthanides on the recovery in 2618 base aluminum alloys[J]. ISIJ International,2005,45(3):405-407.
【8】MILMAN Y V, SIRKO O I. Zr effect of improving mechanical properties in aluminum alloys [J]. Materials Science Forum, 2000, 331(37):1107-1112.
【9】NOGITA K, MCDONALD S D, DAHLE A K. Eutectic modification of Al-Si alloys with rare earth metals[J]. Materials Transactions,2004,45(2):323-326.
【10】杨军军,聂柞仁,付静波,等.稀土在铝合金中的作用及研究进展[J]. 北京工业大学学报, 2002, 28(4): 500-505.
【11】CHEN Z, NI Y F, HE M. Influence of rare earth element on short fatigue crack threshold for Al-Li alloy 2090[J]. Journal of Rare Earths,1994,12(4):268-273.
【12】CHEN Z, WANG Y X, LIU B, et al. Strength-ductility combination in aluminium-lithium alloy 2090 containing rare earth element[J]. Rare Metals,2000,19(1):27-33.
【13】DENG Y, YIN Z, ZHAO K, et al. Effects of Sc and Zr microalloying and aging time at 120C on the corrosion behaviour of an Al-Zn-Mg alloy[J]. Corros Sci,2012(65):288-298.
【14】FANG H C, CHEN K H, CHEN X, et al. Effects of Cr, Yb and Zr additions on localized corrosion of Al-Zn-Mg-Cu alloy[J]. Corros Sci,2009,51:2872-2877.
【15】范常有,张雷,赵茂密,等.Al-Zr-M(M=Fe, Ce和Nd)合金在NaCl溶液中的腐蚀行为研究[J].中国腐蚀与防护学报,2010,30(6):437-441.
【16】LI C L, SHE J, PANG M J, et al. Phase equilibria in the Al-Zr-Nd system at 773 K[J]. Journal of Phase Equilibria and Diffusion,2011,32(1):24-29.
【17】陈红梅,范常有,李智奇,等.Al1-xFex在3.5%NaCl溶液中腐蚀行为影响的研究[J].广西大学学报: 自然科学版,2011,36(5):842-845.
【18】HU J, ZHAN Y Z, PANG M J, et al. Experimental phase diagram of the Al-Er-Zr ternary system[J]. Journal of Phase Equilibria and Diffusion,2011,32(5):412-417.
【19】SHE J, ZHAN Y Z, HU Z H, et al. Experimental study of Al-Zr-Y system phase equilibria at 773 K[J]. Journal of Alloys and Compounds,2010,497:118-120.
【20】YUAN X L, LIU L B, CAI G M, et al. Isothermal section of the Al-Dy-Zr ternary system at 773 K[J]. Journal of Alloys and Compounds,2011(509):6190-6195.
【21】PENG D, ZHAN Y Z, SHE J, et al. Phase equilibria in the ternary Al-Zr-La system[J]. Journal of Alloys and Compounds,2010,507:62-66.
【22】SHE J, ZHAN Y Z, LI C L, et al. Phase equilibria of the Al-Pr-Zr ternary system at 773 K[J]. Journal of Alloys and Compounds,2010,503:57-60.
【23】MESQUITA R A, LEIVA D R, YAVARI A R, et al. Microstructures and mechanical properties of bulk AlFeNd(Cu, Si) alloys obtained through centrifugal force casting[J]. Mater Sci Eng A,2007,452/453:161-169.
【24】BIRBILIS N, BUCHHEIT R G. Electrochemical characteristics of intermetallic phases in aluminum alloys[J]. J Electrchem Soc,2005,152(4):140-151.
【25】FERREIRA S C, ROCHA L A, ARIZA E, et al. Corrosion behaviour of Al/Al3Ti and Al/Al3Zr functionally graded materials produced by centrifugal solid-particle method: Influence of the intermetallics volume fraction[J]. Corros Sci,2011,53:2058-2065.
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