Controlling Corrosion Resistance of a Biodegradable Mg-Y-Zn Alloy with LPSO Phases via Multi-pass ECAP Process

doi:10.1007/s40195-020-01042-y

摘要/Abstract

Abstract:

Mg-RE (rear earth) alloys with long period stacking (LPSO) structures have great potential in biomedical applications. The present work focused on the microstructure and corrosion behaviors of Mg_98.5Y₁Zn_0.5 alloys with 18R LPSO structure after equal channel angular pressing (ECAP). The results showed that the ECAP process changed the grain size and the distribution of LPSO particles thus controlled the total corrosion rates of Mg_98.5Y₁Zn_0.5 alloys. During the ECAP process from 0p to 12p, the grain size reduced from 160-180 μm (as-cast) to 6-8 μm (12p). The LPSO structures became kinked (4p), then started to be broken into smaller pieces (8p), and at last comminuted to fine particles and redistributed uniformly inside the matrix (12p). The improvement in the corrosion resistance for ECAP samples was obtained from 0p to 8p, with the corrosion rate reduced from 3.24 mm/year (0p) to 2.35 mm/year (8p) in simulated body fluid, and the 12p ECAP alloy exhibited the highest corrosion rate of 4.54 mm/year.

Key words: Corrosion behavior, Long period stacking ordered phase, Magnesium alloys, Equal channel angular pressing (ECAP) process, Biomaterials

. [J]. 金属学报英文版, 2020, 33(9): 1180-1190.

Li-Sha Wang, Jing-Hua Jiang, Bassiouny Saleh, Qiu-Yuan Xie, Qiong Xu, Huan Liu, Ai-Bin Ma. Controlling Corrosion Resistance of a Biodegradable Mg-Y-Zn Alloy with LPSO Phases via Multi-pass ECAP Process[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(9): 1180-1190.

图/表 11

Fig. 1 a Schematic illustration of a typical ECAP (equal channel angular pressing) facility die [27] and b processing route

Table1 Composition of the simulated body fluid used in this study

Component	Concentration (g/L)
NaCl	8.0
CaCl₂	0.14
KCl	0.4
NaHCO₃	0.35
MgCl₂·6H₂O	0.1
Glucose	1.0
NaHPO₄·2H₂O	0.06
KH₂PO₄	0.06
MgSO₄·7H₂O	0.06

Fig. 2 Microstructure of as-cast and Mg98.5Y1Zn0.5 alloys revealed by OM and SEM: a, c, e, g OM observation for 0p, 4p, 8p, and 12p; b, d, f, h SEM images for 0p, 4p, 8p, and 12p, respectively

Fig. 3 Histograms of grain size of the Mg98.5Y1Zn0.5 alloy after 0, 4, 8, and 12 ECAP passes

Fig. 4 TEM images of the as-cast and ECAP Mg98.5Y1Zn0.5 alloys: a as-cast; b 4p; c 8p; and d 12p

Fig. 5 Hydrogen evolution volume and the corrosion rate of the Mg98.5Y1Zn0.5 alloys in as-cast and ECAP conditions after immersed in 37 °C SBF for 144 h: a hydrogen evolution volume and b corrosion rate

Fig. 6 Potentiodynamic polarization curves of Mg98.5Y1Zn0.5 alloys in as-cast and ECAP conditions

Table 2 Electrochemical parameters obtained from potentiodynamic polarization curves

	E_corr (V_SCE)	I_corr (μA cm^-2)	E_pit (V_SCE)	P_i (mm/year)	P_AH (mm/year)	P_W (mm/year)
as-cast	- 1.59	21.4	- 1.43	0.48	2.54	3.24
4p	- 1.512	6.2	-	0.142	1.67	2.71
8p	- 1.56	4.16	- 1.44	0.095	1.43	2.35
12p	- 1.406	25.7	-	0.58	2.71	4.54

Fig. 7 SEM observation of as-cast and ECAP Mg98.5Y1Zn0.5 alloys after immersed in 37 °C SBF solution for 144 h: a as-cast; b 4p ECAP; c 8p ECAP; and d 12p ECAP

Fig. 8 SEM observation of selected corrosion regions for ECAPalloys after immersed in 37 °C SBF solution for 24 h: a 4p ECAP; b 8p ECAP; and c 12p ECAP

Fig. 9 Schematic of the grain and second particle during the ECAP process from 0p to 12p

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