Effect of Surface State on Corrosion Resistance of TC4 Ti-alloy

doi:10.11902/1005.4537.2020.153

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (6): 828-836 DOI: 10.11902/1005.4537.2020.153

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Effect of Surface State on Corrosion Resistance of TC4 Ti-alloy

LIU Xing¹^,², RAN Dou¹^,², MENG Huimin¹(

), LI Quande¹^,²^,³, GONG Xiufang²^,³, LONG Bin²^,³

^1.Institute of Advance Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
^2.State Key Laboratory of Long-life High Temperature Materials, Deyang 618000, China
^3.Dongfang Turbine Co. Ltd. , Deyang 618000, China

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Abstract

In order to promote the application of TC4 Ti-alloy for steam turbine blades, the influence of the surface state after shot peening on the corrosion resistance of TC4 Ti-alloy was assessed. The surface morphology and roughness of the TC4 sample after shot peening were characterized by means of transmission electron microscope, energy dispersive spectrometer, laser scanning confocal microscope and X-ray diffractometer. The corrosion resistance of the bare and shot peened TC4 Ti-alloy in 3.5%NaCl solution was comparatively examined by means of potential polarization curve measurement, electrochemical impedance spectroscopy and Mott-Schottky curve measurement. The results show that the surface roughness has a greater influence on the corrosion resistance rather than the small amount of shot peening residues. The polished TC4 Ti-alloy has the lowest corrosion current density, the largest capacitive resistance arc, the least defect of passivation film and the strongest corrosion resistance. After shot peening, the passivation film formed on the surface of the TC4 Ti-alloy peened by cast steel shots is the most stable, and the corrosion resistance is relatively high. Therefore, the smooth surface helps to form a uniform passivation film and increases the corrosion resistance of the TC4 Ti-alloy in 3.5%NaCl solution.

Key words: TC4 Ti-alloy shot peening surface state roughness corrosion resistance

Received: 18 August 2020

ZTFLH:

TG178

Fund: Sichuan Applied Foundation Projiect(2019YJ0699)

Corresponding Authors: MENG Huimin E-mail: menghm16@126.com

About author: MENG Huimin, E-mail: menghm16@126.com

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	Xing LIU
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	Bin LONG

Cite this article:

LIU Xing, RAN Dou, MENG Huimin, LI Quande, GONG Xiufang, LONG Bin. Effect of Surface State on Corrosion Resistance of TC4 Ti-alloy. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 828-836.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.153 OR https://www.jcscp.org/EN/Y2021/V41/I6/828

Fig.1 Surface morphology of TC4 Ti-alloy before shot peening

Fig.2 SEM surface images of TC4 Ti-alloy with CSSP (a, b), GSP (c, d) and CSP (e, f) treated

Fig.3 Three-dimensional surface topographies of TC4 Ti-alloy with untreated (a) and CSSP (b), GSP (c) and CSP (d) treated

Table 1 Surface roughnesses and specific surface areas of TC4 Ti-alloy with untreated and CSSP, GSP and CSP treated

Fig.4 Surface EDS analysis results of the surfaces of TC4 Ti-alloy with untreated (a), CSSP (b), GSP (c) and CSP (d) treated

Fig.5 XRD patterns of TC4 Ti-alloy before and after treatment by CSSP, GSP and CSP

Fig.6 Dynamic potential polarization curves of TC4 Ti-alloy without and with CSSP, GSP and CSP treatment in 3.5%NaCl solution

Table 2 Fitting parameters of dynamic potential polarization curves of TC4 Ti-alloy without and with CSSP, GSP and CSP treatment in 3.5%NaCl solution

Fig.7 Nyquist (a) and Bode (b) plots of TC4 Ti-alloy without and with CSSP, GSP and CSP treatment in 3.5%NaCl solution

Fig.8 Equivalent circuit model of TC4 Ti-alloy without and with CSSP, GSP and CSP treatment in 3.5% NaCl solution

Table 3 Fitting results of EIS of TC4 Ti-alloy without and with CSSP, GSP and CSP treatment in 3.5%NaCl solution

Fig.9 Mott-schottky curves of TC4 Ti-alloy without (a) and with CSSP (b), GSP (c) and CSP (d) in 3.5%NaCl solution

Fig.10 N_d (a) and E_fb (b) of passive films formed on TC4 Ti-alloy without and with CSSP, GSP and CSP treatment in 3.5%NaCl solution

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