Effects of Mg content on pore structure and electrochemical corrosion behaviors of porous Al-Mg alloys

Abstract

Porous Al-Mg alloys with different nominal compositions were successfully fabricated via elemental powder reactive synthesis, and the phase composition, pore structure, and corrosion resistance were characterized with X-ray diffractometer, scanning electron microscope and electrochemical analyzer. The volume expansion ratio, open porosity and corrosion resistance in 3.5% (mass fraction) NaCl aqueous solution of the alloys increase at first and then decrease with the increase of Mg content. The maxima of volume expansion ratio and open porosity are 18.3% and 28.1% for the porous Al-56%Mg (mass fraction) alloy, while there is the best corrosion resistance for the porous Al-37.5% Mg (mass fraction) alloy. The pore formation mechanism can be explained by Kirkendall effect, and the corrosion resistance can be mainly affected by the phase composition for the porous Al-Mg alloys. They would be of the potential application for filtration in the chloride environment.

Keywords

porous Al-Mg alloys / reactive synthesis / pore structure / electrochemical corrosion behaviors

References

[1] ChengJ, ChengS, CaoX-fan. Application of PFSC in seawater desalination retreatment [J]. Advanced Materials Research, 2014, 945: 3510-3513

[2] ChengJ, ZhangJ, YuXiang. Application of new complex flocculant in seawater desalination pretreatment [J]. Applied Mechanics and Materials, 2014, 556: 57-59

[3] WangX-m, ZhaoB, ZhangQ-l, XuD-sheng. Cemented backfilling technology with unclassified tailings based on vertical sand silo [J]. Journal of Central South University of Technology, 2008, 15: 801-807

[4] VoutchkovN. Considerations for selection of seawater filtration pretreatment system [J]. Desalination, 2010, 261(3): 354-364

[5] XuP, DrewesJ E, HeilD. Beneficial use of co-produced water through membrane treatment: Technical-economic assessment [J]. Desalination, 2008, 225(1): 139-155

[6] CheryanM. Ultrafiltration and microfiltration handbook [M]. Lancaster, 1998USACRC Press3

[7] HsiehH PInorganic membranes for separation and reaction [M], 1996New York, USAElsevier263

[8] LefebvreL P, BanhartJ, DunandD. Porous metals and metallic foams: Current status and recent developments [J]. Advanced Engineering Materials, 2008, 10(9): 775-787

[9] GaoH-y, HeY-h, ZouJ, XuN-p, LiuC T. Tortuosity factor for porous FeAl intermetallics fabricated by reactive synthesis [J]. Transactions of Nonferrous Metals Society of China, 2012, 22(9): 2179-2183

[10] HirschJ, Al-SammanT. Superior light metals by texture engineering: Optimized aluminum and magnesium alloys for automotive applications [J]. Acta Materialia, 2013, 61(3): 818-843

[11] KulekciM K. Magnesium and its alloys applications in automotive industry [J]. The International Journal of Advanced Manufacturing Technology, 2008, 39(9/10): 851-865

[12] HeM-f, LiuL, WuY-t, ZhongC, HuW-bin. Influence of microstructure on corrosion properties of multilayer Mg-Al intermetallic compound coating [J]. Corrosion Science, 2011, 53(4): 1312-1321

[13] WuC-y, ZhangJin. State-of-art on corrosion and protection of magnesium alloys based on patent literatures [J]. Transactions of Nonferrous Metals Society of China, 2011, 21(4): 892-902

[14] HernandezA, CalvoJ I, PradanosP, TejerinaF. Pore size distributions in microporous membranes. A critical analysis of the bubble point extended method [J]. Journal of Membrane Science, 1996, 112(1): 1-12

[15] JiangY, HeY-h, XuN-p, ZouJ, HuangB-y, LiuC T. Effects of the Al content on pore structures of porous Ti-Al alloys [J]. Intermetallics, 2008, 16(10): 327-332

[16] GaoH-y, HeY-h, ShenP-z, ZouJ, XuN-p, JiangY, HuangB-y, LiuC T. Porous FeAl intermetallics fabricated by elemental powder reactive synthesis [J]. Intermetallics, 2009, 17(12): 1041-1046

[17] JieJ C, WangH W, ZouC M, WeiZ J, LiT J. Precipitation in Al-Mg solid solution prepared by solidification under high pressure [J]. Materials Characterization, 2014, 87: 19-26

[18] DongH-x, HeY-h, JiangY, WuL, ZouJ, XuN-p, HuangB-y, LiuC T. Effect of Al content on porous Ni–Al alloys [J]. Materials Science and Engineering A, 2011, 528(13): 4849-4855

[19] MassalskiT B, OkamotoH, SubramanianP, KacprzakL. Binary alloys phase diagrams [M]. Vol II. Materials Park, Ohio, ASM International, 2001867

[20] FunamizuY, WatanabeK. Interdiffusion in the Al-Mg system [J]. Transactions of the Japan Institute of Metals, 1972, 13(4): 278-283

[21] SpringerH, KostkaA, Dos SantosJ F, RaabeD. Influence of intermetallic phases and Kirkendall-porosity on the mechanical properties of joints between steel and aluminium alloys [J]. Materials Science and Engineering A, 2011, 528(13): 4630-4642

[22] BrennanS, BermudezK, KulkarniN S, SohnY. Interdiffusion in the Mg-Al system and intrinsic diffusion in ß-Mg₂Al₃ [J]. Metallurgical and Materials Transactions A, 2012, 43(11): 4043-4052

[23] KulkarniK N, LuoA A. Interdiffusion and phase growth kinetics in magnesium-aluminum binary system [J]. Journal of Phase Equilibria and Diffusion, 2013, 34(2): 104-115

[24] OsorioW R, FreitasE S, GarciaA. EIS and potentiodynamic polarization studies on immiscible monotectic Al-In alloys [J]. Electrochimica Acta, 2013, 102: 436-445

[25] LiuJ-h, ZhanZ-w, LiS-m, YuMei. Corrosion resistance of waterborne epoxy coating pigmented by nano-sized aluminium powder on steel [J]. Journal of Central South University, 2012, 19: 46-54

[26] BrettC M A, DiasL, TrindadeB, FischerR, MiesS. Characterisation by EIS of ternary Mg alloys synthesised by mechanical alloying [J]. Electrochimica Acta, 2006, 51(8): 1752-1760

[27] LiaoC-j, HeY-h, YangJ-s, NanB, LiuX-li. Effect of carburization on electrochemical corrosion behaviours of TiAl alloy [J]. Materials Science and Engineering B, 2013, 178(7): 449-456

[28] MansfeldF, KendigM W. Evaluation of anodized aluminum surfaces with electrochemical impedance spectroscopy [J]. Journal of the Electrochemical Society, 1988, 135(4): 828-833

[29] MorenoJ M C, VasilescuE, DrobP, OsiceanuP, VasilescuC, DrobS L, PopaM. Surface analysis and electrochemical behavior of Ti-20Zr alloy in simulated physiological fluids [J]. Materials Science and Engineering B, 2013, 178(18): 1195-1204

[30] HandbookA S M. Corrosion [M]. Vol. 13. Materials Park, OH, ASM International, 1987893-902

[31] SunX T, KangZ X, ZhangX L, JiangH J, GuanR F, ZhangX P. A comparative study on the corrosion behavior of porous and dense NiTi shape memory alloys in NaCl solution [J]. Electrochimica Acta, 2011, 56(18): 6389-6396

[32] LunderO, LeinJ E, AuneT K, NisanciogluK. The role of Mg17Al12 phase in the corrosion of Mg alloy AZ91 [J]. Corrosion, 1989, 45(9): 741-748

[33] BirbilisN, BuchheitR G. Electrochemical characteristics of intermetallic phases in aluminum alloys an experimental survey and discussion [J]. Journal of the Electrochemical Society, 2005, 152(4): B140-B151

[34] MansfeldF, KenkelJ V. Galvanic corrosion of Al alloys-III. The effect of area ratio [J]. Corrosion Science, 1975, 15(4): 239-250