Effect of ECAP Pass on Corrosion Behavior of High-Al Content Magnesium Alloys

Abstract:

Article Preview

In view of low strength and poor corrosion resistance of Mg alloys, a Mg-12Al-0.7Si alloy was designed, fabricated and subjected to equal channel angular pressing (ECAP) in order to refine the microstructure. Microstructure observation and electrochemical performance test were conducted to investigate the influence of the microstructural variation subjected to multi-pass ECAP processing on the corrosion behavior of the alloy. The results showed that both α-Mg matrix and β-Mg17Al12 of the alloy were significantly refined after processing for different passes (2,4,6,8) through route BC, and the 4-pass ECAPed alloy in 3.5% NaCl solution presents the lowest weight loss, lower corrosion current and higher corrosion potential in the polarization curves. The reason for high corrosion resistance of 4-pass ECAPed alloy and the effects of grain size of the matrix and the particle size, distribution of second phase and dynamic precipitates on corrosion behavior of the alloy were discussed.

Info:

Periodical:

Materials Science Forum (Volumes 747-748)

Edited by:

Yafang Han, Junpin Lin, Chengbo Xiao and Xiaoqin Zeng

Pages:

270-275

DOI:

10.4028/www.scientific.net/MSF.747-748.270

Citation:

Q. Fan et al., "Effect of ECAP Pass on Corrosion Behavior of High-Al Content Magnesium Alloys", Materials Science Forum, Vols. 747-748, pp. 270-275, 2013

Online since:

February 2013

Export:

Price:

$38.00

[1] C.X. Shi, H.D. Li, A proposal on accelerating development of metallic magnesium industry in china, Materials Review. 15(4) (2001) 5-6.

[2] A.A. Luo, Recent magnesium alloy development for automotive powertrian application, Mater Sci Forum . 419-422 (2003) 57-66.

[3] N.N. Yang, W. Zhou, Effect of grain size and twins on corrosion behavior of AZ31B magnesium alloy, Corrosion Sci. 52 (2010) 589-594.

DOI: 10.1016/j.corsci.2009.10.018

[4] T. Zhang, Y. Li, Roles of b phase in the corrosion process of AZ91D magnesium alloy, Corrosion Science. 48 (2006) 1249-1264.

DOI: 10.1016/j.corsci.2005.05.011

[5] A.B. Ma, J.H. Jiang, N. Saito, Improving both strength and ductility of Mg alloy through a large number of ECAP passes, Mater Sci. Eng. A 513-514 (2009) 122-127.

DOI: 10.1016/j.msea.2009.01.040

[6] B. Chen, D.L. Lin, Equal-channel angular pressing of magnesium alloy AZ91 and its effects on microstructure and mechanical properties, Materials Science and Engineering A (2007).

[7] L. J Ning, D.M. Jiang, Mechanical properties and microstructure of Al-Mg-Mn-Zr alloy processed by equal channel angular pressing at elevated temperature, Materials characterization 59 (2008)306-311.

DOI: 10.1016/j.matchar.2007.01.016

[8] G.L. Song, A. Atrens, Corrosion mechanisms of magnesium alloy, Adv Eng Mater. 11 (1999) 11-33.

[9] R.C. Zeng, J. Zhang, W.J. Huang, W. Dietezl, K.U. Kainer, C. Blawert, W. Ke, Review of studies on corrosion of magnesium alloys, Trans Nonferrous Met Soc. China 16 (2006) S763-S771.

DOI: 10.1016/s1003-6326(06)60297-5

[10] P.L. Sun, P.W. Kao, C.P. Chang, Metallurgical and Materials Transactions A 35 (2004) 1359.

[11] V.V. Stolyarov, Y.T. Zhu, I.V. Alexandrov, T.C. Lowe, R.Z. Valiev, Materials Science and Engineering A 299 (2001) 59.

[12] Annual Book of ASTM Standards Parts 3 and 4, 1977, p.722.

[13] L.N. Wang, G. Sun, Corrosion Behaviour of AZ61 Magnesium Alloy in NaCl Solution, Mechanical Engineering & Automation, (2010) 06-0091-03.

[14] W. Liang, L.P. Bian, Transformation matrix analysis on the shear characteristics in multi-pass ECAP processing and predictive design of new ECAP routes. Materials Science and Engineering A 527 (2010) 5557-5564.

DOI: 10.1016/j.msea.2010.05.058

[15] S.Y. Chang, S.W. Lee, K.M. Kang, S. Kamado, Y. Kojima, Improvement of mechanical characteristics in severely plastic-deformed mg alloys, Mater Trans, 45 (2004) 488-492.

DOI: 10.2320/matertrans.45.488

[16] J.Y. Chang, J.S. Yoon, G.H. Kim, Development of submicron sized grain during cyclic equal channel angular pressing [J]. Scr Mater, 2001, 45(3): 347.

DOI: 10.1016/s1359-6462(01)01040-5

[17] L. Wang, S.G. Tian, Influence of hot extrusion on microstructure and mechanical properties of AZ31 magnesium alloy [J]. Trans Nonferrous Met Soc China, 2006, 16(s3): s1770-s1773.

[18] D. Song, A.B. Ma, Corrosion behavior of bulk ultra-fine grained AZ91D magnesium alloy fabricated by equal-channel angular pressing. Corrosion Science 53 (2011) 362-373.

DOI: 10.1016/j.corsci.2010.09.044

[19] E. Poorqasemi, O. Abootalebi, M. Peikari, F. Haqdar, Investigating accuracy of the Tafel extrapolation method in HCl solutions, Corros Sci. 51 (2009) 1043-1054.

DOI: 10.1016/j.corsci.2009.03.001

[20] M.C. Zhao, M. Liu, G.L. Song, A. Atrens, Influence of homogenization annealing of AZ91 on mechanical properties and corrosion behaviour, Adv. Eng. Mater. 10 (2008) 93-103.

DOI: 10.1002/adem.200700234

[21] D. Daloz, P. Steinmetz, G. Michot, Corrosion behavior of rapidly solidified magnesium aluminum zinc alloys, Corrosion, 53 (12) (1997) 944-954.

DOI: 10.5006/1.3290279

[22] M. Janecek, B. Hadzima, R.J. Hellmig, Y. Estrin, The influence of microstructure on the corrosion properties of cu polycrystals prepared by ECAP, Metall Mater. 43 (2005) 258-271.

[23] K. Nisancioglu, O. Lunder, T.K. Aune, Corrosionmechanismof AZ91magnesium alloy, in Proceedings of 47th World Magnesium Association, Mcleen, Virginia, 1990, p.43.

[24] W.S. Loose, L.M. Pidgeon, J.C. Mathes, N.E. Woldmen (Eds. ), Corrosion and Protection of Magnesium, ASM International, Materials Park, OH, 1946, p.173.

[25] G.L. Song, A. Atrens, M. Dargusch, Influence of microstructure on the corrosion of diecast AZ91D, Corrosion Science 41(1999)249-273.

DOI: 10.1016/s0010-938x(98)00121-8

In order to see related information, you need to Login.