Effect of Build-up Direction and Annealing on Corrosion Properties of Selected Laser Melting Ti6Al4V Alloy

doi:10.11902/1005.4537.2024.220

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (4): 995-1004 DOI: 10.11902/1005.4537.2024.220

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Effect of Build-up Direction and Annealing on Corrosion Properties of Selected Laser Melting Ti6Al4V Alloy

ZHANG Shanshan¹^,², LIU Yuancai¹, XU Tiewei¹(

), YANG Fazhan¹^,²

1 School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
2 Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Qingdao 266520, China

Cite this article:

ZHANG Shanshan, LIU Yuancai, XU Tiewei, YANG Fazhan. Effect of Build-up Direction and Annealing on Corrosion Properties of Selected Laser Melting Ti6Al4V Alloy. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 995-1004.

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Abstract

The influence of build-up direction and post annealing treatment on corrosion properties of the selective laser melting (SLM) Ti6Al4V alloy were investigated in terms of its microstructure evolution and corrosion performance versus processing conditions. The passivation and corrosion behavior of the SLM alloy with different morphology of α/α′ phases was assessed in Hanks solution. The build-up directions and post annealing treatments of the SLM-Ti6Al4V alloy significantly result in differences of its corrosion resistance in Hanks solution. The corrosion resistance in the XZ plane of the SLM-Ti6Al4V alloy heat-treated below 800 ℃ is better than that of the XY plane, showing obvious anisotropy. The size of the α/α′ phase increases with the increasing annealing temperatures, correspondingly, the anisotropy of the corrosion resistance weakens. The SLM-Ti6Al4V alloy after annealing at temperatures below 800 ℃ presents the pitting corrosion, but the corrosion along boundaries in the alloy after annealing at temperatures above 900 ℃. The excellent corrosion resistance was obtained for the alloy annealed at 800 ℃ due to a desired α/α′ phase size and the density of boundaries.

Key words: laser forming Ti-alloy anisotropy corrosion behavior simulated body fluid

Received: 24 July 2024 32134.14.1005.4537.2024.220

ZTFLH:

TG146.2

Fund: Natural Science Foundation of Shandong Province(ZR2024ME184);Natural Science Foundation of Shandong Province(ZR2020ME006);Key Research and Development Program of Shandong Province(2018GGX102027)

Corresponding Authors: XU Tiewei, E-mail: twxu@163.com

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	ZHANG Shanshan
	LIU Yuancai
	XU Tiewei
	YANG Fazhan

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.220 OR https://www.jcscp.org/EN/Y2025/V45/I4/995

Fig.1 Morphology (a) and size distribution (b) of SLM powders, schematic diagram of SLM direction and sampling (c)

Fig.2 Schematic diagram of the corrosion testing device for SLM-Ti6Al4V alloys in Hanks solution

Fig.3 Microstructures of SLM-Ti6Al4V alloy samples: (a) AS-XY, (b) AS-XZ, (c) 650-XY, (d) 650-XZ, (e) 800-XY, (f) 800-XZ, (g) 900-XY, (h) 900-XZ, (i) 1050-XY, (j) 1050-XZ

Fig.4 Total fraction and size of α′ and α two phases of SLM-Ti6Al4V alloy with different sampling directions as a function of annealing temperature

Fig.5 XRD patterns of SLM-Ti6Al4V alloy with different sampling direction after annealing at different temperatures

Fig.6 Potentiodynamic polarization curves of SLM-Ti6Al4V alloy with XY plane (a) and XZ plane (b) in Hanks solution

Fig.7 Effects of annealing temperature on E_corr and I_corr of SLM-Ti6Al4V alloy with different orientations in Hanks solution

Fig.8 Bode (a, b) and Nyquist (c, d) plots of SLM-Ti6Al4V alloy with XY plane (a, c) and XZ plane (b, d) in Hanks solution

Fig.9 Equivalent circuit diagrams of EIS of SLM-Ti6Al4V alloy annealed below 800 ℃ (a) and above 900 ℃ (b) in Hanks solution

Table 1 Fitting parameters of EIS of SLM-Ti6Al4V alloy with different states

Fig.10 XPS fine peaks of Ti 1s of the passivation films formed on two SLM-Ti6Al4V alloy samples in Hanks solution: (a) 800-XY, (b) 900-XY

Fig.11 Surface morphologies of SLM-Ti6Al4V alloy with different states after corrosion in Hanks solution: (a) AS-XY, (b)AS-XZ, (c) 650-XY, (d) 650-XZ, (e) 800-XY, (f) 800-XZ, (g) 900-XY, (h) 900-XZ, (i) 1050-XY, (j) 1050-XZ

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