Corrosion Behavior of Selective Laser Melted AlSi10Mg Alloy in NaCl Solution and Its Dependence on Heat Treatment

doi:10.1007/s40195-019-00903-5

Abstract

Abstract:

This work investigates the corrosion behavior of AlSi10Mg alloy produced by selective laser melting (SLM) and the counterparts heat-treated at 450-550 °C in 3.5 wt% NaCl solution. Electrochemical measurements and weight loss tests together with microstructural characterizations were conducted. The SLM-produced alloy displays a microstructure with a continuous network of Si particles, exhibiting superior corrosion behavior. After heat treatment, the Si particles are coarsened and isolated and Al matrix dissolves into their surrounding area, thereby degrading the corrosion resistance properties. Therefore, the corrosion resistance of AlSi10Mg alloy degrades with increasing the heat treatment temperature.

Key words: Aluminum, Selective laser melting, XRD, Electrochemistry, Pitting corrosion

Xin-Hui Gu, Jun-Xi Zhang, Xiao-Lei Fan, Lai-Chang Zhang. Corrosion Behavior of Selective Laser Melted AlSi10Mg Alloy in NaCl Solution and Its Dependence on Heat Treatment[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(3): 327-337.

Figures/Tables 12

Table 1 Chemical compositions of SLM-produced AlSi10Mg (wt%)

Fig. 1 XRD patterns of SLM-produced AlSi10Mg and heat-treated counterparts

Fig. 2 SEM images of SLM-produced AlSi10Mg alloy for a untreated and heat-treated at b 450 °C, c 500 °C, d 550 °C for 2 h

Fig. 3 a SEM micrograph and EDS mappings of b Mg, c Al, d Si of SLM-produced AlSi10Mg alloy after heat treatment at 550 °C for 2 h

Fig. 4 Statistical analysis of a size distribution, b volume fraction and c size and number density of Si particles as a result of heat treatment

Fig. 5 Weight loss curves for untreated and heat-treated SLM-produced AlSi10Mg samples after weight loss tests

Fig. 6 SEM micrographs of SLM-produced AlSi10Mg samples after 45 days immersion for a, b untreated and heat-treated at c, d 450 °C, e, f 500 °C, g, h 550 °C for 2 h

Fig. 7 Longitudinal section micrographs of SLM-produced AlSi10Mg samples after 7 days immersion for a untreated and heat-treated at b 450 °C, c 500 °C, d 550 °C for 2 h

Fig. 8 Potentiodynamic polarization curves of SLM-produced AlSi10Mg alloys and heat-treated counterparts in 3.5% NaCl solution at room temperature (E potential; i current density)

Table 2 Fitting results by using least square method from weak-polarization region (± 70 mV) of potentiodynamic polarization curves

Fig. 9 Electrochemical impedance spectra of SLM-produced AlSi10Mg alloys and heat-treated counterparts in 3.5% NaCl solution at room temperature: a Nyquist plots; b, c bode plots; d equivalent circuit diagram

Table 3 Fitting results of electrochemical impedance spectra for SLM-produced AlSi10Mg alloys and heat-treated counterparts in 3.5 wt% NaCl solution at room temperature (n1, n2 index that represents the deviation from a pure capacitor of CPE)

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