Role of Microalloyed Y and Gd in Improving the Corrosion Resistance of Rolled Mg-3Al-1Zn Alloy

doi:10.1007/s40195-021-01332-z

Abstract

Abstract:

The corrosion performances of rolled AZ31 alloy with addition of Y and Gd were comparatively investigated. The corrosion rates of AZ31 alloy modified with Y and Gd were 3.3 and 3.7 mm/y immersing for 24 h in 3.5 wt% NaCl solution, respectively, which were much lower than that of AZ31 alloy (23.6 mm/y). The remarkable improvement in corrosion performance by adding Y or Gd was ascribed to preferentially form less noble Al₂Y or Al₆GdMn₆ and more protective corrosion product layer, resulting in the reduction in H₂ evolution rate and the enhancement of passivity.

Key words: AZ31 alloy, Second phases, Volta potential difference, Y, Gd

Panpan Wang, Haitao Jiang, Yujiao Wang, Yun Zhang, Jingchao Tao. Role of Microalloyed Y and Gd in Improving the Corrosion Resistance of Rolled Mg-3Al-1Zn Alloy[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(6): 941-947.

Figures/Tables 6

Table 1 Chemical composition (in wt%) of tested samples [14]

Alloys	Fe	Cu	Ni	Si	Al	Zn	Mn	Y	Gd	Mg
AZ31	0.0014	0.0003	< 0.0002	0.0076	3.04	0.97	0.13	-	-	Bal.
AZY312	0.0012	0.0006	< 0.0002	0.0065	3.16	0.96	0.12	0.18	-	Bal.
AZG312	0.0011	0.0004	< 0.0002	0.0062	3.03	0.96	0.14	-	0.15	Bal.

Fig. 1 Microstructures and HAADF-STEM images of second phases in as-rolled alloys: a, d AZ31, b, e AZY312, c, f AZG312 and corresponding XRD analysis g

Fig. 2 SKPFM image and corresponding potential profiles along second phases of AZY312 a, b and AZG312 c, d alloys

Fig. 3 Tafel curves a and hydrogen evolution corrosion rates b of as-rolled alloys

Fig. 4 Surface corrosion morphologies and partial enlarged view after immersion of 5 min: AZ31 a, b, AZY312 c, d and AZG312 e, f alloys

Fig. 5 Cross section and surface corrosion morphologies after immersion of 24 h: a, d AZ31, b, e AZY312, c, f AZG312 alloys and corresponding XRD patterns g

References 27

[1]	S. Pawar, T.J.A. Slater, T.L. Burnett, X. Zhou, G.M. Scamans, Z. Fan, G.E. Thompson, P.J. Withers, Acta Mater. 90, 133 (2017).
[2]	S. Yu, R. Jia, T. Zhang, F. Wang, J. Hou, H. Zhang, Acta Metall. Sin. Engl. Lett. 32, 433 (2019).
[3]	Y. Zhang, H. Jiang, S. Wang, Y. Wang, S. Tian, H. Lin, G. Zhang, Y. Yang, Z. Xu, Mater. Sci. Eng. A 140566, 804 (2021).
[4]	H. Niu, F. Cao, K. Deng, K. Nie, J. Kang, H. Wang, Acta Metall. Sin. Engl. Lett. 33, 362 (2020).
[5]	L. Yang, T. Wang, C. Liu, Y. Ma, L. Wu, H. Yan, X. Zhao, W. Liu, J. Alloys Compd. 159473, 870 (2021).
[6]	F. Zhong, H. Wu, Y. Jiao, R. Wu, J. Zhang, L. Hou, M. Zhang J. Mater. Sci. Technol. 39, 124 (2020).
[7]	A. Atrens, S. Johnston, Z. Shi, M. S. Dargusch, Scr. Mater. 154 (2018).
[8]	L. Cui, R. Zeng, S. Gao, P. Li, F. Zhang, S. Li, Corros. Sci. 84, 118 (2017).
[9]	R. Arrabal, E. Matykina, A. Pardo, M.C. Merino, K. Paucar, M. Mohedano, P. Casajus, Corros. Sci. 2, 55 (2012).
[10]	S.M. Baek, J.S. Kang, H.J. Shin, C.D. Yim, B.S. You, H.Y. Ha, S.S. Park, Corros. Sci. 227, 118 (2017).
[11]	X. Peng, S. Xu, D. Ding, G. Liao, G. Wu, W. Liu, W. Ding, J. Mater. Sci. Technol. 16, 72 (2021).
[12]	J. Chen, L. Tan, X. Yu, K. Yang, J. Mater. Sci. Technol. 503, 35 (2019).
[13]	M. Mandal, A.P. Moon, G. Deo, C.L. Mendis, K. Mondal, Corros. Sci. 1, 78 (2014).
[14]	P. Wang, H. Jiang, Y. Wang, Y. Zhang, Y. Zhang, S. Tian, Z. Cao, Int. J. Miner. Metall. Mater. (2021). https://doi.org/10.1007/s1261302122684
[15]	H. Hao, X. Liu, C. Fang, X. Zhang, Mater. Sci. Eng. A 27, 698 (2017).
[16]	M.F. Hurley, C.M. Efaw, P.H. Davis, Corrosion 2, 71 (2015).
[17]	B. Mingo, R. Arrabal, M. Mohedano, C.L. Mendis, R. del Olmo, E. Matykina, N. Hort, M.C. Merino, A. Pardo, Mater. Des. 48, 130 (2017).
[18]	S. Baek, S. Lee, J.C. Kim, J. Kwon, H. Jung, S. Lee, K. Lee, S.S. Park, Corros. Sci. 108998, 178 (2021).
[19]	R.H. Buzolin, M. Mohedano, C.L. Mendis, B. Mingo, D. Tolnai, C. Blawert, K.U. Kainer, H. Pinto, N. Hort, Mater. Sci. Eng. A 682, 238 (2017).
[20]	F. Cao, Dissertation, Taiyuan University of Technology, 2019.
[21]	J. Liu, L. Yang, C. Zhang, B. Zhang, T. Zhang, Y. Li, K. Wu, F. Wang, J. Alloys Compd. 648, 782 (2019).
[22]	R. Zeng, L. Sun, L. Sun, Y. Zheng, H. Cui, E. Han, Corros. Sci. 2, 79 (2014).
[23]	S. Leleu, B. Rives, J. Bour, N. Causse, N. Pebere, Electrochim. Acta 586, 290 (2018).
[24]	S. Yin, W. Duan, W. Liu, L. Wu, J. Bao, J. Yu, L. Li, Z. Zhao, J. Cui, Z. Zhang, Corros. Sci. 108962, 177 (2020).
[25]	S. Yin, W. Duan, W. Liu, L. Wu, J. Yu, Z. Zhao, M. Liu, P. Wang, J. Cui, Z. Zhang, Corros. Sci. 108419, 166 (2019).
[26]	M. Esmaily, D.B. Blücher, J.E. Svensson, M. Halvarsson, L.G. Johansson, Scr. Mater. 91, 115 (2016).
[27]	Y. Li, W. Xiao, F. Wang, T. Hu, C. Ma, J. Alloys Compd. 33, 745 (2018).