Effect of Ag on the Microstructure, Mechanical and Bio-corrosion Properties of Fe-30Mn Alloy

doi:10.1007/s40195-019-00911-5

Abstract

Abstract:

In the current work, biodegradable Fe-30Mn-XAg (X?=?1, 2, 5, 10 wt%) alloys were prepared by the rapid solidification with copper-mold-casting technology. Phase analysis demonstrates that Fe-30Mn-XAg alloys consist of austenite γ phase with a fcc structure and martensite ε phase with a hcp structure. The yield strength of the samples increases with increasing Ag contents. Compared with Fe-30Mn alloy, the degradation rates of Fe-30Mn-XAg in Hank’s solution are significantly improved. Cytotoxicity evaluation reveals that the Fe-30Mn-1Ag and Fe-30Mn-2Ag alloys perform less toxicity on the Human Umbilical Vein Endothelial Cells (HUVEC), while Fe-30Mn-5Ag and Fe-30Mn-10Ag alloys perform no toxicity on it. The contact angles of deionized water on the Fe-30Mn-XAg alloy surface were ranged from 55° to 69°, which is beneficial to the adhesion and growth of the cells. Besides, the addition of Ag leads to a much lower M/H slope, particularly for the Fe-30Mn-5Ag alloy exhibiting a non-magnetic property as SS316L. Therefore, the present Fe-30Mn-XAg alloys would be potential candidates for degradable metals.

Key words: Biodegradable metals, Fe-based alloy, Corrosion behavior, Biocompatibility

Ruo-Yu Liu, Ran-Gan He, Yan-Xia Chen, Sheng-Feng Guo. Effect of Ag on the Microstructure, Mechanical and Bio-corrosion Properties of Fe-30Mn Alloy[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(11): 1337-1345.

Figures/Tables 13

Fig. 1 XRD patterns of the as-cast Fe-30Mn-XAg alloys (X?=?1, 2, 5 and 10)

Fig. 2 SEM backscattered electron images of Fe-30Mn-1Ag a; Fe-30Mn-2Ag b; Fe-30Mn-5Ag c; Fe-30Mn-10Ag alloys d; the TEM bright field image e, the SAED pattern f of the bright particles for Fe-30Mn-5Ag alloy

Fig. 3 Compressive yield strength and plastic strain of different alloys

Fig. 4 OCP a and potentiodynamic polarization curves b of different samples in Hank’s solution

Table 1 Electrochemical corrosion parameters and magnetic susceptibility of Fe-Mn-XAg alloys

Samples	OCP (V)	E_corr (V)	i_corr (μA/cm²)	R_p (Ω/cm²)	P (mm/a)	χ (m³/kg)
Fe-30Mn-1Ag	-?0.79	-?1.09	7.33	3.33?×?10⁵	0.088	2.16?×?10^-6
Fe-30Mn-2Ag	-?0.79	-?1.06	9.17	2.17?×?10⁵	0.113	2.00?×?10^-6
Fe-30Mn-5Ag	-?0.80	-?1.04	10.52	1.73?×?10⁵	0.143	6.06?×?10^-7
Fe-30Mn-10Ag	-?0.80	-?1.15	7.40	2.42?×?10⁵	0.128	1.03?×?10^-6

Fig. 5 Corrosion morphologies of Fe-30Mn-1Ag a, Fe-30Mn-2Ag b, Fe-30Mn-5Ag c, Fe-30Mn-10Ag d alloys after potentiodynamic polarization test up to pitting

Fig. 6 Percentage of mass loss a and compressive yield strength b of the samples after 12-week immersion

Fig. 7 Corrosion morphologies of Fe-30Mn-1Ag a, Fe-30Mn-2Ag b, Fe-30Mn-5Ag c, Fe-30Mn-10Ag d alloys after 12-week immersion and the EDS of corrosion products

Fig. 8 Schematic diagram of corrosion mechanism for Fe-30Mn-XAg alloys in Hank’s solution

Fig. 9 Ion concentrations of Fe30Mn-XAg after immersion in Hank’s solution for 2 and 4 weeks, respectively

Fig. 10 Cell viability of HUVEC after 1, 2 and 4 days incubation in 10% extracts

Fig. 11 Static contact angle of deionized water on Fe-30Mn-XAg alloy surface

Fig. 12 Magnetic hysteresis loops of the as-cast Fe-30Mn-XAg alloys

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