Wear Performance and Corrosion Behavior of Nano-SiCp-Reinforced AlSi7Mg Composite Prepared by Selective Laser Melting

doi:10.1007/s40195-021-01220-6

Abstract

Abstract:

It is one of the future trends to create materials in situ by laser additive manufacturing. AlSi7Mg/nano-SiCp composites were successfully in situ prepared by selective laser melting in our previous study. After adding 2 wt% nano-SiC particles, the tensile stress and strain increased to 502.94 ± 6.40 MPa and 10.64 ± 1.06%, respectively. For the first time in the present study, we systematically studied and compared the wear performance and corrosion behavior of AlSi7Mg with its composite. We conducted the ball-on-flat frictional wear test at room temperature, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and the immersion corrosion tests in 3.5 wt% NaCl solution. The results showed that composite had higher wear resistance, while AlSi7Mg was more resistant to pitting corrosion. However, the further pitting corrosion of composite was restrained because of the in situ phase nano-Al₄C₃ and the residual nano-SiCp.

Key words: Selective laser melting, AlSi7Mg composite, Wear performance, Corrosion behavior

Min Wang, Yuanjie Zhang, Bo Song, Qingsong Wei, Yusheng Shi. Wear Performance and Corrosion Behavior of Nano-SiCp-Reinforced AlSi7Mg Composite Prepared by Selective Laser Melting[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(9): 1213-1222.

Figures/Tables 14

Fig. 1 a COF curves of S0 and S2, b results of average COF, and average mass loss

Fig. 2 a, c Worn surfaces of S0 and b, d worn surfaces of S2

Table 1 Local EDS results of the wear debris

Points	Al	Si	Mg	C	O
Point 1	89	5.7	0	0	5.7
Point 2	81	7.2	0.40	0.070	12

Fig. 3 Open-circuit potential of S0 and S2 in 3.5 wt% NaCl solution: a OCP curves, b OCP values

Fig. 4 Potentiodynamic polarization curves of S0 and S2

Table 2 Fitting parameters of polarization curves for S0 and S2

Samples	E_corr (V_Ag/AgCl)	I_corr (A/cm²)	E_pit (V_Ag/AgCl)
S₀	- 0.87	1.6 × 10^-8	- 0.54
	- 0.75	2.1 × 10^-8	- 0.54
	- 0.75	1.2 × 10^-8	- 0.50
Average	- 0.79 ± 0.057	1.6 ± 0.37 × 10^-8	- 0.53 ± 0.019
S₂	- 0.64	2.6 × 10^-8	- 0.62
	- 0.64	2.0 × 10^-8	- 0.62
	- 0.64	3.0 × 10^-8	- 0.60
Average	- 0.64 ± 0.0007	2.53 ± 0.41 × 10^-8	- 0.61 ± 0.0087

Fig. 5 Overall morphologies of the corroded surfaces: a S0 and b S2; and three-dimensional pitting corrosion images: c S0, d S2

Fig. 6 Surface morphologies after the potentiodynamic polarization test: a S0, b the magnification area in a, c S2, d the magnification area in c

Fig. 7 a Nyquist b Bode curves of S0 and S2

Table 3 Equivalent circuit parameters obtained from fitted EIS results

Samples	R_s (Ω cm²)	Y₀₁ (μΩ^-1 cm^-2sⁿ)	n₁	R_oxd (kΩ cm²)	Y₀₂ (μΩ^-1 cm^-2sⁿ)	n₂	R_ct (kΩ cm²)
S₀	9.51	9.08	0.89	128	6.88	0.72	296
	11.1	6.13	0.90	186	9.51	0.69	235
	11.2	6.09	0.90	178	7.01	0.66	271
Average	10.6 ± 0.77	7.10 ± 1.40	0.89 ± 0.004	164 ± 25.7	7.80 ± 1.21	0.70 ± 0.03	267 ± 25.0
S₂	9.25	7.16	0.90	27.8	26.1	0.78	97.8
	12.1	8.58	0.89	37.2	21.5	0.83	107
	12.9	8.23	0.89	28.2	22.5	0.81	116
Average	11.4 ± 1.57	7.99 ± 0.60	0.89 ± 0.005	31.1 ± 4.34	23.4 ± 1.98	0.80 ± 0.02	107 ± 7.34

Fig. 8 Average weight loss rates of S0 and S2 after immerging in the 3.5 wt% NaCl solution

Fig. 9 Corrosion morphology after immerging in 3.5 wt% NaCl for 6 h: a, b S0; c, d S2

Table 4 EDS result of point 1

Elements	Weight percentage (%)	Atomic percentage (%)
C	3.90	7.60
O	14.8	21.8
Mg	0.10	0.10
Al	74.00	64.5
Si	7.20	6.00
In total	100	100

Fig. 10 Corrosion morphologies of S0: a 12 h, b 24 h; and corrosion morphologies of S2: c 12 h, d 24 h, in which the inset shows the grain distribution of S2 tested by EBSD

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