Effect of NH+4 Concentration on Corrosion Behavior of N80 Steel in CO2-saturated 3%NaCl Solutions

doi:10.11902/1005.4537.2023.173

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (3): 745-754 DOI: 10.11902/1005.4537.2023.173

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Effect of NH⁺₄ Concentration on Corrosion Behavior of N80 Steel in CO₂-saturated 3%NaCl Solutions

XIE Hui¹^,²^,³, YU Chao¹^,²^,³, HUA Jing¹^,²^,³, JIANG Xiu¹^,²^,³(

)

1. State Key Laboratory of Chemical Safety, Qingdao 266100, China
2. SINOPEC Research Institute of Safety Engineering Co., Ltd., Qingdao 266100, China
3. Registration Center for Chemicals, Ministry of Emergency Management, Qingdao 266100, China

Cite this article:

XIE Hui, YU Chao, HUA Jing, JIANG Xiu. Effect of NH⁺₄ Concentration on Corrosion Behavior of N80 Steel in CO₂-saturated 3%NaCl Solutions. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 745-754.

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Abstract

NH₄Cl was one of the important factors causing corrosion of tubing steel in shale oil environment. Herewith, the effect of NH⁺₄ concentration on the corrosion behavior of N80 steel in 3%NaCl solution saturated with CO₂ was studied by means of mass loss method, electrochemical methods, scanning electron microscope (SEM), 3D profilometer, X-ray diffraction(XRD), and X-ray photoelectron spectroscopy (XPS). The results showed that NH⁺₄ concentration had a dual effect on the corrosion rate of N80 steel, i.e. promoting and inhibiting the corrosion rate. When the NH⁺₄ concentration was 0~500 mg/L, the uniform corrosion rate of N80 steel increased with the increasing NH⁺₄ concentration, while in the NH⁺₄ concentration range of 1000~2000 mg/L, the uniform corrosion rate of N80 steel decreased with the increasing NH⁺₄ concentration, however, the pitting corrosion rate showed a similar trend as the uniform corrosion. When the NH⁺₄ concentration was 500 mg/L, the uniform corrosion rate and pitting corrosion rate of N80 steel were the highest. Competition adsorption occurred between NH⁺₄ and Cl^- on the metal surface at NH⁺₄ concentrations ≤ 500 mg/L, while NH⁺₄ adsorption inhibited corrosion when NH⁺₄ concentration exceeded 500 mg/L.

Key words: N80 steel saturated CO₂ environment NH⁺₄ corrosion NH⁺₄ absorption

Received: 22 May 2023 32134.14.1005.4537.2023.173

ZTFLH:

TG174

Fund: SINOPEC Innovation Scheme(320144)

Corresponding Authors: JIANG Xiu, E-mail: jiangx.qday@sinopec.com

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.173 OR https://www.jcscp.org/EN/Y2024/V44/I3/745

Fig.1 Metallographic microstructure of N80 steel

Fig.2 Corrosion rates of N80 steel in 3%NaCl solutions with different NH⁺₄ concentrations

Fig.3 Self corrosion potentials of N80 steel in 3%NaCl solutions with different NH⁺₄ concentrations

Fig.4 Linear polarization resistances (a) and corrosion rates (b) of N80 steel in 3%NaCl solutions with different NH⁺₄ concentrations

Fig.5 General (a) and detail (b) views of polarization curves of N80 steel in 3%NaCl solutions with different NH⁺₄ concentrations

Fig.6 Nyquist (a1~e1) and Bode (a2~e2) diagrams of N80 steel in 3%NaCl solutions containing 0 mg/L (a), 150 mg/L (b), 500 mg/L (c), 1000 mg/L (d) and 2000 mg/L (e) NH⁺₄

Fig.7 Equivalent circuit diagram used for EIS fitting analysis

Table 1 Fitting data of EIS of N80 steel

Fig.8 (R_m + R_ct) values of N80 steel in 3%NaCl solutions with different NH⁺₄ concentrations

Fig.9 Corrosion morphologies (a1~e1), 3D contour graphics (a2~e2) and elemental compositions (a3~e3) of N80 steel after immersion in 3%NaCl solutions containing 0 mg/L (a), 150 mg/L (b), 500 mg/L (c), 1000 mg/L (d) and 2000 mg/L (e) NH⁺₄

Fig.10 XRD patterns of N80 steel after immersion in 3%NaCl solutions containing 0 and 2000 mg/L NH⁺₄

Fig.11 XPS fine peaks of Fe 2p (a), C 1s (b) and O 1s (c), and survey spectrum (d) of N80 steel after immersion in 3%NaCl solutions with different NH⁺₄ concentrations

Fig.12 Adsorption mechanism schematic of N atoms on N80 steel surface in 3%NaCl solutions with low concentration (a) and high concentration (b) of NH⁺₄

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