Effect of Heat Treatment Process on Corrosion Resistance of Ti6321 Alloy

doi:10.11902/1005.4537.2022.023

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (1): 152-158 DOI: 10.11902/1005.4537.2022.023

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Effect of Heat Treatment Process on Corrosion Resistance of Ti6321 Alloy

ZHANG Jiahuan¹^,², CUI Zhongyu¹(

), FAN Lin², SUN Mingxian²

^1.School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
^2.State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China

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Abstract

The effect of heat treatments on the microstructure and corrosion behavior of Ti6321 Ti-alloy in artificial seawater and 5 mol/L hydrochloric acid solution was investigated by means of XRD, electrochemical tests, SEM and confocal laser scanning microscope. Results show that the three groups of Ti6321 Ti-alloy, which has been subjected to three different heat treatments, exhibit excellent passivation ability in artificial seawater with more or less the same level of corrosion resistance. In 5 mol/L HCl solution, the corrosion resistance of the Ti6321 Ti-alloy with widmanstatten structure is the worst, followed by equiaxed ones, while the alloy with double structure presents the best corrosion resistance.

Key words: Ti6321 alloy microstructure artificial seawater solution hydrochloric acid corrosion resistance

Received: 19 January 2022 32134.14.1005.4537.2022.023

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51931008)

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	Jiahuan ZHANG
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Cite this article:

ZHANG Jiahuan, CUI Zhongyu, FAN Lin, SUN Mingxian. Effect of Heat Treatment Process on Corrosion Resistance of Ti6321 Alloy. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 152-158.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.023 OR https://www.jcscp.org/EN/Y2023/V43/I1/152

Fig.1 Equiaxed (a), double (b) and widmanstatten (c) structures of Ti6321 alloy after heat treatment under three different conditions

Fig.2 SEM observations of Ti6321 alloy after heat treatment under three different conditions: (a) equiaxed structure, (b) double structure, (c) widmanstatten structure

Fig.3 XRD patterns of Ti6321 alloy after heat treatment under three different conditions

Fig.4 Self-corrosion potentials of Ti6321 alloy samples with three different structures in artificial seawater (a) and 5 mol/L HCl solution (b)

Fig.5 Polarization curves of Ti6321 alloy samples with three different structures in artificial seawater (a) and in 5 mol/L HCl solution (b)

Table 1 Tafel fitting results of polarization curves of Ti6321 alloy samples with three different structures in artificial seawater

Table 2 Tafel fitting results of polarization curves of Ti6321 alloy samples with three different structures in 5 mol/L HCl solution

Fig.6 Electrochemical impedance spectra of Ti6321 alloy samples with three different structures in artificial seawater (a, c, e) and 5 mol/L HCl solution (b, d, f)

Table 3 Fitting results of EIS of Ti6321 alloy samples with three different structures in artificial seawater

Table 4 Fitting results of EIS of Ti6321 alloy samples with three different structures in 5 mol/L HCl solution

Fig.7 CLSM surface morphologies of Ti6321 alloy samples after immersion for 10 d in 5 mol/L HCl solution: (a) equiaxed structure, (b) double structure, (c) widmanstatten structure

Fig.8 SEM surface morphologies of Ti6321 alloy samples after immersion for 10 d in 5 mol/L HCl solution: (a) equiaxed structure, (b) double structure, (c) widmanstatten structure

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