Corrosion Behaviors of Selective Laser Melted Inconel 718 Alloy in NaOH Solution
TANG Yanbing1, SHEN Xinwang1,2, LIU Zhihong2, QIAO Yanxin2(), YANG Lanlan2, LU Daohua1, ZOU Jiasheng2, XU Jing1
1.Marine Equipment and Technology Institute, Jiangsu University of Science and Technology, Zhenjiang 212003, China 2.School of Materials Science and Technology, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Cite this article:
TANG Yanbing, SHEN Xinwang, LIU Zhihong, QIAO Yanxin, YANG Lanlan, LU Daohua, ZOU Jiasheng, XU Jing. Corrosion Behaviors of Selective Laser Melted Inconel 718 Alloy in NaOH Solution. Acta Metall Sin, 2022, 58(3): 324-333.
Inconel 718 alloy is a popular material used for additive manufacturing. Corrosion involvement is crucial for its application. The corrosion behaviors of the additive manufacturing Inconel 718 alloy in neutral NaCl solution and acidic solution have been thoroughly investigated and documented. However, information available in the literature regarding the corrosion behaviors of additive manufacturing Inconel 718 alloy in alkaline solution is insufficient. In this paper, the corrosion behavior of Inconel 718 alloy fabricated through selective laser melting (SLM Inconel 718) in NaOH solution was studied using open circuit potential (OCP), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), potentiostats polarization, Mott-Schottky analysis, and X-ray photoelectron spectroscopy (XPS). The results were compared with a commercial rolled Inconel 718 alloy (R Inconel 718). Pitting corrosion was observed in both SLM Inconel 718 alloy and R Inconel 718 alloy. SLM Inconel 718 alloy has lower activity and corrosion rate compared with R Inconel 718 alloy. Because the passive film formed on the surface of SLM Inconel 718 alloy has a lower content of porous NiO and a higher content of compact Cr2O3, the passive film is more compact; however, the donor/acceptor density is lower in the passive film.
Fund: National Key Research and Development Program of China(2018YFC0309100);High-Tech Ship Project of the Ministry of Industry and Information Technology (No.2018[473]), and Natural Science Foundation for Colleges and Universities of Jiangsu Province(19KJB460015)
About author: QIAO Yanxin, professor, Tel: 18851407972, E-mail: yxqiao@just.edu.cn
Table 1 Chemical compositions of selective laser melted (SLM) and rolled (R) Inconel 718 alloys[16]
Fig.1 OM (a, c) and SEM (b, d) images of the SLM Inconel 718 (a, b) and R Inconel 718 (c, d)
Fig.2 Open circuit potentials (EOCP) of SLM Inconel 718 and R Inconel 718 in 0.1 mol/L NaOH solution (t—time)
Fig.3 Potentiodynamic polarization curves of SLM Inconel 718 and R Inconel 718 in 0.1 mol/L NaOH solution (E—potential, i—current density)
Fig.4 Surface morphologies of uncorroded (a, b) and corroded (c, d) SLM Inconel 718 (a, c) and R Inconel 718 (b, d) (Inset in Fig.4d shows the partial enlargement of corroded R Inconel 718)
Fig.5 Electrochemical impedance spectroscopic (EIS) data of SLM Inconel 718 and R Inconel 718 in 0.1 mol/L NaOH solution (ZIm—imaginary impedance, ZRe—real impedance, |Z|—imped-ance modulus, f—frequency)
Fig.6 Schematic of equivalent circuit modeling of EIS (Rs—solution resistance, Qf—passive film capacitance, Rf—passive film resistance, Cdl—double layer capacitance, Rct—charge transfer resistance)
Alloy
Rs
Ω·cm2
Qf
10-5 F·cm-2
n
Rf
104 Ω·cm2
Cdl
10-5 F·cm-2
Rct
105 Ω·cm2
SLM Inconel 718
13.97 ± 0.05
6.04 ± 0.45
0.89 ± 0.01
5.79 ± 0.11
3.69 ± 0.19
3.44 ± 0.08
R Inconel 718
9.52 ± 0.05
8.72 ± 0.10
0.88 ± 0.01
3.54 ± 0.10
4.27 ± 0.29
2.47 ± 0.09
Table 2 EIS fitted results of the SLM Inconel 718 and R Inconel 718
Fig.7 Current-time curves (a) and double-log plots of current-time (b) of SLM Inconel 718 and R Inconel 718 in 0.1 mol/L NaOH solution (Inset in Fig.7a shows the partial enlargement of current-time curves. k—slope)
Fig.8 Mott-Schottky plots for SLM Inconel 718 and R Inconel 718 in 0.1 mol/L NaOH solution (a), and donor density (Nd) and acceptor density (Na) of passive films and oxides(b) (CSC—capacitance of the space charge layer)
Fig.9 Details of XPS spectra of SLM Inconel 718 (a, c, e, g, i) and R Inconel 718 (b, d, f, h, j) (%—peak area percentage, Ni0—Ni metal, Niox—NiO, Nihy—Ni(OH)2, Fe0—Fe metal, Feox—Fe3O4 and Fe2O3, Fehy—FeOOH and Fe(OH)3, Cr0—Cr metal, Crox—Cr2O3, Crhy—Cr(OH)3, Mo0—Mo metal, Moox—MoO3, Nb0—Nb metal, Nb2+—NbO, Nb5+—Nb2O5)
Fig.10 Depth profiles of the elements of passive films formed on SLM Inconel 718 (a) and R Inconel 718 (b)
Fig.11 Depth distribution of different compositions in the passive film on the surface of SLM Inconel 718 (a) and R Inconel 718 (b)
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