Influence of Construction Angle and Supporter on Corrosion Behavior of AlSi10Mg Alloy Prepared by Laser Additive Manufacturing

doi:10.11902/1005.4537.2025.103

Journal of Chinese Society for Corrosion and protection

2026, Vol. 46

Issue (1): 145-154 DOI: 10.11902/1005.4537.2025.103

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Influence of Construction Angle and Supporter on Corrosion Behavior of AlSi10Mg Alloy Prepared by Laser Additive Manufacturing

JI Lei¹, ZHANG Zhen¹(

), WANG Liqing¹, LI Yunlong¹, MA Kai¹, ZHAO Zhanyong¹, BAI Peikang¹^,²

^1.School of Materials Science and Engineering, North University of China, Taiyuan 030051, China
^2.Taiyuan University of Science and Technology, Taiyuan 030024, China

Cite this article:

JI Lei, ZHANG Zhen, WANG Liqing, LI Yunlong, MA Kai, ZHAO Zhanyong, BAI Peikang. Influence of Construction Angle and Supporter on Corrosion Behavior of AlSi10Mg Alloy Prepared by Laser Additive Manufacturing. Journal of Chinese Society for Corrosion and protection, 2026, 46(1): 145-154.

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Abstract

Four different bulk AlSi10Mg alloys were fabricated by laser additive manufacturing with powder bed fusion, while their growth along either vertical, angle horizontal, or 45-degree inclined orientation, as well as on a proper supporter. The corrosion behavior of the four bulk alloys in 3.5%NaCl solution was assessed by means of electrochemical techniques. The results showed that the alloys exhibited a combination of columnar and equiaxed grains with different size and distribution. The growth orientations and supporter have effect on the porosity and residual stress of the alloys, and the vertical growth alloy had the highest porosity and residual stress. Electrochemical results showed that the alloy grown along 45-degree inclined orientation had the best corrosion resistance and the highest pitting potential and polarization resistance. The effect of microstructure on corrosion resistance of the LPBF-AlSi10Mg alloys was discussed.

Key words: laser powder bed fusion AlSi10Mg alloy construction angle supporting electrochemical corrosion

Received: 28 March 2025 32134.14.1005.4537.2025.103

ZTFLH:

TG17

Fund: National Natural Science Foundation of China(52105409);Special Fund for Science and Technology Innovation Teams of Shanxi Province

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	JI Lei
	ZHANG Zhen
	WANG Liqing
	LI Yunlong
	MA Kai
	ZHAO Zhanyong
	BAI Peikang

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.103 OR https://www.jcscp.org/EN/Y2026/V46/I1/145

Fig.1 Macroscopic schematics of four additive manufacturing AlSi10Mg alloy samples: (a) Vertical 90°, (b) Braced 45°, (c) Unbraced 45°, (d) Horizontal 0°

Fig.2 Metallographic structures of four AlSi10Mg alloy samples after etching: (a) Vertical 90°, (b) Braced 45°, (c) Unbraced 45°, (d) Horizontal 0°

Fig.3 SEM morphologies of four AlSi10Mg alloy samples after etching: (a) Vertical 90°, (b) Braced 45°, (c) Unbraced 45°, (d) Horizontal 0°

Fig.4 EBSD Inverse pole figure maps of four AlSi10Mg alloy samples: (a) Vertical 90°, (b) Braced 45°, (c) Unbraced 45°, (d) Horizontal 0°

Fig.5 Polar plots of four AlSi10Mg alloy samples: (a) Vertical 90°, (b) Braced 45°, (c) Unbraced 45°, (d) Horizontal 0°

Fig.6 Differential maps and distribution histograms of grain boundary orientations of four AlSi10Mg alloy samples: (a) Vertical 90°, (b) Braced 45°, (c) Unbraced 45°, (d) Horizontal 0°

Fig.7 Residual stresses of four AlSi10Mg alloy samples

Fig.8 Polarization curves (a) and corresponding cumul-ative probability distributions of pitting potentials (b) for four AlSi10Mg alloy samples in 3.5%NaClsolution

Fig.9 Fitting electrochemical parameters of polarization curves of four AlSi10Mg alloy samples in 3.5%NaCl solution: (a) corrosion current density, (b) corrosion potential

Table 1 Electrochemical parameters obtained by fitting the electrochemical impedance spectra of four AlSi10Mg alloy samples in 3.5%NaCl solution

Fig.11 SEM surface morphologies of four AlSi10Mg alloy samples after immersion in 3.5%NaCl solution for 4 h: (a) Vertical 90°, (b) Braced 45°, (c) Unbraced 45°, (d) Horizontal 0°

Fig.12 SEM morphology (a) and EDS element mappings (b-d) of hole induced corrosion for Vertical 90°sample after 4 h immersion in 3.5%NaCl solution

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