Electrochemical Corrosion Behavior of 2Cr-1Ni-1.2Mo-0.2V Steel in NH4H2PO4 Solution

doi:10.11902/1005.4537.2021.176

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (4): 551-562 DOI: 10.11902/1005.4537.2021.176

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Electrochemical Corrosion Behavior of 2Cr-1Ni-1.2Mo-0.2V Steel in NH₄H₂PO₄ Solution

WANG Tong¹^,², MENG Huimin¹(

), GE Pengfei¹^,², LI Quande¹^,²^,³(

), GONG Xiufang²^,³, NI Rong²^,³, JIANG Ying²^,³, GONG Xianlong²^,³, DAI Jun²^,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

The electrochemical corrosion behavior of 2Cr-1Ni-1.2Mo-0.2V steel in NH₄H₂PO₄ solutions was investigated by means of open circuit potential measurement, polarization curve measurement, electrochemical impedance spectroscopy, laser scanning confocal microscopy, scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray polycrystalline diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that with the increase of NH₄H₂PO₄ concentration, the corrosion rate of 2Cr-1Ni-1.2Mo-0.2V steel was increased rapidly at first and then slowly. Pitting corrosion occurred when the 2Cr-1Ni-1.2Mo-0.2V steel immersed in solutions of 0~1 mmol/L NH₄H₂PO₄ for 20 h. But only uniform corrosion might occur when the steel immersed in solutions of 30-120 mmol/L NH₄H₂PO₄ for 20 h. The corrosion product of 2Cr-1Ni-1.2Mo-0.2V steel was a two layered scale, the outer layer composed mainly of Fe₃(PO₄)₂ and FePO₄, and the inner layer composed mainly of Fe₃O₄. With the increase of NH₄H₂PO₄ concentration, the coverage and compactness of the outer corrosion product layer increased, and Cr, Mo enriched in the inner corrosion product layer, thereby the corrosion resistance of 2Cr-1Ni-1.2Mo-0.2V steel was increased.

Key words: CrNiMoV steel NH₄H₂PO₄ corrosion product film electrochemical corrosion

Received: 23 July 2021

ZTFLH:

TG174

Corresponding Authors: MENG Huimin,LI Quande E-mail: menghm16@126.com;quandelee@126.com

About author: LI Quande, E-mail: quandelee@126.com
MENG Huiming, E-mail: menghm16@126.com

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	Tong WANG
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	Xiufang GONG
	Rong NI
	Ying JIANG
	Xianlong GONG
	Jun DAI
	Bin LONG

Cite this article:

WANG Tong, MENG Huimin, GE Pengfei, LI Quande, GONG Xiufang, NI Rong, JIANG Ying, GONG Xianlong, DAI Jun, LONG Bin. Electrochemical Corrosion Behavior of 2Cr-1Ni-1.2Mo-0.2V Steel in NH₄H₂PO₄ Solution. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 551-562.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.176 OR https://www.jcscp.org/EN/Y2022/V42/I4/551

Fig.1 Average corrosion rate of the 1R steel immersed in NH₄H₂PO₄ solution at different concentrations for 20 h

Fig.2 Corrosion morphologies before pickling (a1-f1) and corrosion morphologies after pickling (a2-f2) of the 1R steel immersed in 0 mmol/L (a1, a2), 1 mmol/L (b1, b2), 30 mmol/L (c1, c2), 60 mmol/L (d1, d2), 90 mmol/L (e1, e2),120 mmol/L (f1, f2) NH₄H₂PO₄ solution for 20 h

Fig.3 Three-dimensional surface corrosion morphologies of the selected region1 (a), 2 (b), 3 (c), 4 (d), 5 (e) and 6 (f) in Fig.2

Fig.4 Micro-morphologies of the outer corrosion product film (a) and the inner corrosion product film (b) of the 1R steel immersed in 120 mmol/L NH₄H₂PO₄ solution for 20 h

Table 1 Surface roughness and specific surface area of the 1R steel immersed in 30, 60, 90, and 120 mmol/L NH₄H₂PO₄solution for 20 h

Table 2 EDS analysis of the corrosion product film on the 1R steel immersed in 120 mmol/L NH₄H₂PO₄ solution for 20 h

Fig.5 XRD patterns of the corrosion product on the 1R steel immersed in 120 mmol/L NH₄H₂PO₄ solution for 20 h

Fig.6 Fe 2p3/2 (a-d), Cr2p3/2 (e-h) and Mo 3d (i-l) XPS spectra of the inner corrosion product film on the 1R steel immersed in 30 mmol/L (a, e, j), 60 mmol/L (b, f, i), 90 mmol/L (c, g, k), 120 mmol/L (d, h, l) NH₄H₂PO₄ solution for 20 h

Table 3 XPS spectra peak aera and its related percentage for Fe, Cr, Mo related compounds in the inner corrosion product film

Table 4 Atom percent of the main elements in the inner corrosion product film

Solution	R_s / Ω·cm²	Q_f		R_f / Ω·cm²	R_L / Ω·cm²	L / H	Q_dl		R_ct / Ω·cm²
Solution	R_s / Ω·cm²	Y₀ / Ω^-1·cm^-2·S ⁿ	$n$	R_f / Ω·cm²	R_L / Ω·cm²	L / H	Y₀ / Ω^-1·cm^-2·S ⁿ	$n$	R_ct / Ω·cm²
0 mmol/L	7.58 $×$ 10⁴	---	---	---	---	---	6.76 $×$ 10^-5	0.81	6.33 $×$ 10⁴
1 mmol/L	5816	---	---	---	---	---	2.16 $×$ 10^-4	0.62	9977
30 mmol/L	297.6	1.95 $×$ 10^-3	0.97	203	255.9	2647	5.87 $×$ 10^-4	0.77	480.4
60 mmol/L	143	3.03 $×$ 10^-3	0.97	114.3	42.3	751.4	9.64 $×$ 10^-4	0.76	331.8
90 mmol/L	103	3.09 $×$ 10^-3	0.95	77.54	0.03	257.7	1.02 $×$ 10^-3	0.76	266.9
120 mmol/L	80.76	3.37 $×$ 10^-3	0.97	57.47	0.01	180.4	1.09 $×$ 10^-3	0.76	243.4

Table 5 Electrochemical impedance spectroscopy parameters of 1R steel immersed in NH₄H₂PO₄ solution at different concentrations for 20 h

Fig.7 Open circuit potentials (a) of the 1R steel immersed in NH₄H₂PO₄ solution at different concentrations for 20 h and the pH, electrical conductivity (b) of the test solution

Fig.8 Polarization curves (a) and electrochemical parameters (b) of the 1R steel immersed in NH₄H₂PO₄ solution at different concentrations for 20 h

Fig.9 Nyquist plots (a, b) and Bode plots (c, d) of the 1R steel immersed in NH₄H₂PO₄ solution at different concentrations for 20 h

Fig.10 Equivalent circuits of the 1R steel immersed in 0-1 mmol/L (a) and 30-120 mmol/L (b) NH₄H₂PO₄ solution for 20 h

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