Influence of Dry-wet Ratio on Electrochemical Corrosion Behavior of CrNiMoV Steel in 120 mmol/L NH4H2PO4 Solution

doi:10.11902/1005.4537.2021.340

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (6): 948-958 DOI: 10.11902/1005.4537.2021.340

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Influence of Dry-wet Ratio on Electrochemical Corrosion Behavior of CrNiMoV Steel in 120 mmol/L NH₄H₂PO₄ Solution

WANG Tong¹^,², MENG Huimin¹, GUO Weihua²^,³, GE Pengfei¹^,², GONG Xiufang²^,³, NI Rong²^,³, GONG Xianlong²^,³, DAI Jun²^,³, LONG Bin²^,³, LI Quande²^,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

Cite this article:

WANG Tong, MENG Huimin, GUO Weihua, GE Pengfei, GONG Xiufang, NI Rong, GONG Xianlong, DAI Jun, LONG Bin, LI Quande. Influence of Dry-wet Ratio on Electrochemical Corrosion Behavior of CrNiMoV Steel in 120 mmol/L NH₄H₂PO₄ Solution. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 948-958.

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Abstract

The effect of dry-wet ratio of cyclically dry/wet testing, i.e. drying in atmosphere of (55±5)% humidity and wetting in 120 mmol/L NH₄H₂PO₄ solution at an external temperature of (25±2) ℃, on the electrochemical corrosion behavior of 2Cr-1Ni-1.2Mo-0.2V and 2Cr-4Ni-0.4Mo-0.1V steels respectively were investigated by laser scanning confocal microscopy (CLSM), X-ray polycrystalline diffractometer (XRD), X-ray photoelectron spectroscope (XPS), open circuit potential and electrochemical impedance spectroscope. The results show that after tested for 21 d with dry/wet ratio of 0, 1/3, 1 and 3 respectively, uniform corrosion and pitting corrosion emerged for the two steels. With the increase of dry/wet ratio, the corrosion rate and the pitting degree of the two steels increased, but the corrosion resistance of 2Cr-1Ni-1.2Mo-0.2V steel was better than 2Cr-4Ni-0.4Mo-0.1V steel. The corrosion product film of the two steels composed mainly of Fe₃(PO₄)₂, FePO₄, Fe₂O₃, and FeOOH. However, with the increasing dry/wet ratio, the amount of Fe₃(PO₄)₂ and FeOOH decreased, that of Fe₂O₃increased in the corrosion product film. Meanwhile, the open circuit potential and charge-transfer resistance decreased, it is worth pointing out in particular that the corrosion rate of 2Cr-1Ni-1.2Mo-0.2V steel exhibited corrosion rate smaller than 2Cr-4Ni-0.4Mo-0.1V steel.

Key words: CrNiMoV steel NH₄H₂PO₄ drying/wetting cycle dry/wet ratio corrosion

Received: 26 November 2021

ZTFLH:

TG174

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

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	Tong WANG
	Huimin MENG
	Weihua GUO
	Pengfei GE
	Xiufang GONG
	Rong NI
	Xianlong GONG
	Jun DAI
	Bin LONG
	Quande LI

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.340 OR https://www.jcscp.org/EN/Y2022/V42/I6/948

Fig.1 Changes of corrosion rate of 1R steel (a) and 2R steel (b) with dry/wet ratio

Fig.2 Corrosion images of corrosion products of 1R (a-d) and 2R (e-h) steel at dry/wet=0 (a, e), dry/wet=1/3 (b, f), dry/wet=1 (c, g) and dry/wet=3 (d, h) after test for 21 d

Table 1 Surface roughness and specific surface area of the 1R steel and 2R steel, which were tested in different immersion conditions for 21 d

Fig.3 Corrosion images of 1R (a-d) and 2R (e-h) after removal of corrosion products at dry/wet=0 (a, e), dry/wet=1/3 (b, f), dry/wet=1 (c, g) and dry/wet=3 (d, h) after test for 21 d

Fig.4 Three-dimensional morphologies of pits on 1R (a-d) and 2R (e-h) at dry/wet=0 (a, e), dry/wet=1/3 (b, f), dry/wet=1 (c, g) and dry/wet=3 (d, h) after test for 21 d

Fig.5 Aperture and depth of pits on 1R steel (a) and 2R steel (b) after test under different immersion conditions

Fig.6 XRD patterns of the corrosion product on the 1R steel (a, b) and 2R steel (c, d) after test under different immersion conditions

Fig.7 XPS spectra of corrosion product film on the 1R steel and 2R steel after test under dry/wet=1/3 condition for 21 d: (a) 1R steel, Fe2p3/2, (b) 1R steel, Cr2p3/2, (c) 2R steel, Fe2p3/2, (d) 2R steel, Cr2p3/2

Table 2 Binding energies of the primary components in the corrosion product film

Table 3 XPS spectra peak aera and its related percentage for Fe 2p3/2、Cr 2p3/2 related compounds in the corrosion product filmon the 1R steeland 2R steelafter test underdry/wet=1/3

Fig.8 Open circuit potentials of 1R steel (a) and 2R steel (b) aftertest under different immersion conditions for 21 d

Fig.9 Nyquist plots (a, c) and Bode plots (b, d) of the 1R steel (a, b) and 2R steel (c, d) after test under different immersion conditions for 21 d

Fig.10 Equivalent circuits of the 1R steel and 2R steel aftertest under different immersion conditions for 21 d

Steel	Condition	R_s / Ω·cm²	Q_f		R_f / Ω·cm²	Q_dl		R_ct / Ω·cm²
Steel	Condition	R_s / Ω·cm²	Y₀ / Ω^-1·cm^-2·S ⁿ	$n$	R_f / Ω·cm²	Y₀ / Ω^-1·cm^-2·S ⁿ	n	R_ct / Ω·cm²
1R	Dry/wet=0	80.36	3.19 $×$ 10^-5	0.31	118.2	5.1 $×$ 10^-4	0.52	861.9
	Dry/wet=1/3	81.03	2.33 $×$ 10^-7	0.62	93.03	7.08 $×$ 10^-4	0.57	585.6
	Dry/wet=1	80.93	3.26 $×$ 10^-6	0.74	18.11	7.86 $×$ 10^-4	0.57	539
	Dry/wet=3	79.4	4.7 $×$ 10^-4	0.76	20.57	6.29 $×$ 10^-4	0.74	181
2R	Dry/wet=0	85.09	4.76 $×$ 10^-4	0.65	224.7	5.76 $×$ 10^-4	0.91	455.7
	Dry/wet=1/3	86.58	3.24 $×$ 10^-4	0.73	160.3	3.39 $×$ 10^-4	0.92	297.2
	Dry/wet=1	85.51	3.64 $×$ 10^-4	0.77	132	3.81 $×$ 10^-4	0.90	262.4
	Dry/wet=3	82.65	6.02 $×$ 10^-4	0.76	120.3	7.14 $×$ 10^-4	0.95	139.1

Table 4 Electrochemical impedance spectroscopy parameters of 1R steel and 2R steel aftertest under different immersion conditions for 21 d

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