Effect of Mn Addition and Heat Treatment on the Corrosion Behaviour of Mg-Ag-Mn Alloy

doi:10.1007/s40195-023-01636-2

Abstract

Abstract:

The high corrosion sensitivity and the potential bio-toxicity of Mg-Ag alloys limit their wide applications for the production of implanted devices. In the present work, Mn is added into the Mg-Ag alloy to optimize its corrosion behaviour. The corrosion behaviour of Mg-Ag-Mn alloys is investigated with the underlying microstructural factors examined. The Mg-Ag alloy with 2 wt% Mn exhibits the highest corrosion resistance after post-casting heat treatment at 440 °C. The addition of Mn results in α-Mn phase with the incorporation of Fe, which suppresses the cathodic activity of impurity Fe. Further, heat treatment of the cast alloys homogenizes the distribution of Ag and promotes the precipitation of α-Mn phase. The former removes Ag segregations as potential cathodes; the latter promotes a more uniform distribution of cathodes and, therefore, prevents localized corrosion.

Key words: Mg-Ag alloy, Mn addition, Post-casting heat treatment, Cathodic activity, Corrosion mechanism

You Lv, Yupeng Zhang, Xi Liu, Zehua Dong, Xiaorong Zhou, Xinxin Zhang. Effect of Mn Addition and Heat Treatment on the Corrosion Behaviour of Mg-Ag-Mn Alloy[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(4): 665-677.

Figures/Tables 10

Table 1 Chemical compositions of Mg-Ag-xMn (x = 0, 0.5, 1.0, 2.0 and 3.0) alloys (wt%)

	Mg	Ag	Mn	Fe
Mg-Ag	Rem	2.132	-	0.0034
Mg-Ag-0.5Mn	Rem	2.181	0.437	0.0048
Mg-Ag-1.0Mn	Rem	2.234	0.961	0.0033
Mg-Ag-2.0Mn	Rem	2.241	1.947	0.0044
Mg-Ag-3.0Mn	Rem	2.045	2.896	0.0042
High purity Mg-Ag	Rem	2.023	-	0.0012

Fig. 1 a Weight loss of AC and PCHT Mg-Ag-xMn (x = 0, 0.5, 1.0, 2.0 and 3.0) alloys; b corrosion rate calculated from weight loss; c average corrosion rates during 36 h immersion

Table 2 Corrosion rates (mm/y) of AC and PCHT Mg-Ag-xMn (x = 0, 0.5, 1, 2 and 3) alloys

Time (h)	Specimens
Time (h)	AC-0	AC-0.5	AC-1.0	AC-2.0	AC-3.0	PCHT-0	PCHT-0.5	PCHT-1.0	PCHT-2.0	PCHT-3.0
0	0	0	0	0	0	0	0	0	0	0
2	33.09 ± 4.82	26.52 ± 3.29	36.74 ± 8.62	30.66 ± 2.47	34.31 ± 5.73	47.93 ± 7.68	18.12 ± 1.33	18.00 ± 1.39	12.87 ± 1.42	19.91 ± 1.58
4	27.98 ± 5.59	31.14 ± 8.07	27.25 ± 7.09	22.63 ± 4.89	25.42 ± 5.18	41.85 ± 6.50	13.38 ± 1.27	17.03 ± 1.41	12.28 ± 1.18	20.44 ± 1.16
8	50.49 ± 6.65	39.17 ± 6.81	31.57 ± 6.75	21.53 ± 3.05	29.62 ± 6.44	36.98 ± 6.99	11.25 ± 0.71	12.28 ± 1.05	9.61 ± 1.06	15.26 ± 1.02
12	57.38 ± 9.61	36.33 ± 4.74	28.67 ± 4.70	19.83 ± 2.68	26.76 ± 4.46	36.94 ± 5.23	9.44 ± 0.81	10.22 ± 0.89	8.27 ± 0.97	12.00 ± 0.85
24	101.91 ± 14.7	23.82 ± 2.87	19.56 ± 2.885	12.53 ± 2.41	16.56 ± 2.71	40.96 ± 4.05	5.79 ± 0.43	6.46 ± 0.58	4.78 ± 0.45	7.42 ± 0.62
36	189.11 ± 17.2	18.85 ± 3.58	16.43 ± 3.55	11.58 ± 2.71	14.01 ± 3.37	55.033 ± 8.05	5.62 ± 0.50	5.33 ± 0.47	3.58 ± 0.47	5.81 ± 0.53

Fig. 2 a Surface profiles of the alloys after immersion for 12 h, then removal of corrosion product; b comparison of maximum corrosion depth

Fig. 3 SEM micrographs of AC and PCHT Mg-Ag-xMn (x = 0, 0.5, 1.0, 2.0 and 3.0) alloys: a AC alloys; b, c PCHT alloys; d a representative area of AC Mg-Ag-2Mn alloy with elemental maps; e a representative area of PCHT Mg-Ag-2Mn alloy with elemental maps

Fig. 4 TEM micrographs of AC and PCHT Mg-Ag-2Mn alloys: a AC alloy; b PCHT alloy; c, d EDX mapping analysis of both alloys; e representative EDX spectrum of precipitates in PCHT Mg-Ag-2Mn alloy; f bright field and HRTEM micrographs of rod-shaped precipitates; g bright field and HRTEM micrographs of needle-shaped precipitates; h atomic arrangement in needle-shaped precipitates

Fig. 5 a, b SEM micrographs of the corrosion product layer on PCHT Mg-Ag-2Mn alloy surface; c, d SEM micrographs of the corrosion product layer on PCHT Mg-Ag alloy surface; e EDX spectra of corrosion products on both PCHT Mg-Ag-2Mn and PCHT Mg-Ag alloy surfaces

Fig. 6 XPS spectra of Mn on PCHT Mg-Ag-2Mn alloy surface after immersion in a 0.9 wt% NaCl solution for various durations

Fig. 7 a Bright field micrograph of PCHT Mg-Ag-2Mn alloy foil after 5 s immersion in NaCl solution; b EDX mapping analysis of a

Fig. 8 a Cathodic polarization of Mg-Ag-xMn (x = 0, 0.5, 1.0, 2.0 and 3.0) alloys; b the variation of cathodic current density at − 1.7 V (vs SCE)

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