Effect of CaCl2 and NaHCO3 in Physiological Saline Solution on the Corrosion Behavior of an As-Extruded Mg-Zn-Y-Nd alloy

doi:10.1007/s40195-020-01119-8

Abstract

Abstract:

In this study, the corrosion behaviors of an as-extruded Mg-4%Zn-2%Y-1.8%Nd (in wt.%) alloy in different physiological saline solutions were investigated and compared. The results indicated that the alloy in the 9 g/L NaCl had the higher corrosion resistance than that containing with CaCl₂ and NaHCO₃. Moreover, it demonstrated that the corrosion behaviors of the alloy in two types of solutions were all dependent on the pre-immersion time. In the 9 g/L NaCl solution, the corrosion current densities of the alloy decreased firstly with the pre-immersion time being < 4 h and then increased with the pre-immersion time prolonging from 4 to 48 h. However, in the 9 g/L NaCl solution containing with CaCl₂ and NaHCO₃, the corrosion current density of the alloy exhibited the adverse trend with the prolonging the pre-immersion time. Failure analysis demonstrated that the changes of corrosion resistance in two solutions were mainly dominated by the constituents formed in surface films.

Key words: Magnesium alloy, Biomaterial, Corrosion, Simulated body fluids, Pre-immersion

Baojie Wang, Daokui Xu, Tianyu Zhao, Liyuan Sheng. Effect of CaCl₂ and NaHCO₃ in Physiological Saline Solution on the Corrosion Behavior of an As-Extruded Mg-Zn-Y-Nd alloy[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(2): 239-247.

Figures/Tables 8

Fig. 1 XRD pattern of the as-extruded Mg-4%Zn-2%Y-1.8%Nd alloy

Fig. 2 SEM observations to the microstructure of the as-extruded Mg-4%Zn-2%Y-1.8%Nd alloy: a low, b high magnification images. c EDS analysis to the bright particles in the image b

Fig. 3 Potentiodynamic polarization curves of the as-extruded Mg-4%Zn-2%Y-1.8%Nd alloy before and after pre-immersion for different times in solutions of: a 9 g/L NaCl, b 9 g/L NaCl + 0.14 g/L CaCl2 + 0.35 g/L NaHCO3

Table 1 Fitting data from the polarization curves of the as-extruded Mg-4%Zn-2%Y-1.8%Nd alloy in different solutions

Solutions	Pre-immersion time (h)	E_corr (V_SCE)	i_corr (1 × 10^-6 A/cm²)
9 g/L NaCl	0	- 1.461 ± 0.003	8.30 ± 0.15
	2	- 1.266 ± 0.002	8.09 ± 0.20
	4	- 1.337 ± 0.003	4.13 ± 0.05
	8	- 1.285 ± 0.004	4.47 ± 0.05
	24	- 1.278 ± 0.003	5.62 ± 0.05
	48	- 1.206 ± 0.002	6.64 ± 0.10
9 g/L NaCl + 0.14 g/L CaCl₂ + 0.35 g/L NaHCO₃	0	- 1.589 ± 0.005	30.39 ± 0.25
	2	- 1.551 ± 0.005	58.90 ± 1.80
	4	- 1.525 ± 0.004	55.60 ± 1.50
	8	- 1.506 ± 0.003	55.01 ± 1.30
	24	- 1.412 ± 0.002	9.16 ± 0.15
	48	- 1.305 ± 0.003	5.29 ± 0.10

Fig. 4 Hydrogen evolution curves of the as-extruded Mg-4%Zn-2%Y-1.8%Nd alloy measured in different solutions

Fig. 5 Surface corrosion morphologies of the as-extruded Mg-4%Zn-2%Y-1.8%Nd alloy after immersion for: a 2 h, b 8 h, c 24 h, d 48 h in 9 g/L NaCl solution; e 2 h, f 8 h, g 24 h, h 48 h in 9 g/L NaCl + 0.14 g/L CaCl2 + 0.35 g/L NaHCO3 solution

Fig. 6 Three-dimensional (3D) images of the as-extruded Mg-4%Zn-2%Y-1.8%Nd alloy after being immersed for 48 h in solutions of: a 9 g/L NaCl and b 9 g/L NaCl + 0.14 g/L CaCl2 + 0.35 g/L NaHCO3

Fig. 7 SEM images of the cross sections of the as-extruded Mg-4%Zn-2%Y-1.8%Nd alloy after being immersed for 48 h in solutions of: a 9 g/L NaCl, b 9 g/L NaCl + 0.14 g/L CaCl2 + 0.35 g/L NaHCO3

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Effect of CaCl₂ and NaHCO₃ in Physiological Saline Solution on the Corrosion Behavior of an As-Extruded Mg-Zn-Y-Nd alloy

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