Effect of Water-soluble Corrosion Inhibitor on Corrosion Behavior of Q235 Pipeline Steel for Construction

doi:10.11902/1005.4537.2022.372

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (5): 1041-1048 DOI: 10.11902/1005.4537.2022.372

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Effect of Water-soluble Corrosion Inhibitor on Corrosion Behavior of Q235 Pipeline Steel for Construction

HE Jing¹(

), YU Hang², FU Ziying¹, YUE Penghui³

^1.Infrastructure Management Office, Northeastern University, Shenyang 110819, China
^2.School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
^3.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

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Abstract

The effect of water-soluble corrosion inhibitor on the corrosion behavior of pipeline Q235 steel beneath artificial sediments in a liquid of simulated building pipeline sewage was assessed by means of mass-loss measurement, potentiodynamic polarization curve measurement, electrochemical impedance spectroscopy and wire beam electrode (WBE) technique. The results show that the water-soluble corrosion inhibitor IMC-80-N-4 can effectively alleviate the corrosion of Q235 steel in the test environment. With the increasing concentration of the corrosion inhibitor, the inhibitor film formed and became compact gradually on the steel surface. The corrosion inhibition effect of 25 mg/L water-soluble corrosion inhibitor is the best, which reduces the free-corrosion current density of the steel substrate by two orders of magnitude. Moreover, the galvanic current in the area covered with sediments was also reduced. Therefore, regular injection of 25 mg/L water-soluble corrosion inhibitor in the construction pipeline can effectively inhibit the corrosion of Q235 steel, besides, the inhibitor exhibits a good effect even under the condition of sediment coverage. That can significantly improve the safe operation of the construction pipeline, so that increase and extend the service life of the building.

Key words: water soluble corrosion inhibitor construction pipeline Q235 steel corrosion behavior

Received: 28 November 2022 32134.14.1005.4537.2022.372

ZTFLH:

TG172

Fund: Liaoning Revitalization Talents Program(XLYC2002071);Key Laboratory of Preparation and Applications of Environmentally Friendly Materials (Jilin Normal University), Ministry of Education(2020011)

Corresponding Authors: HE Jing, E-mail: 470010175@qq.com

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Cite this article:

HE Jing, YU Hang, FU Ziying, YUE Penghui. Effect of Water-soluble Corrosion Inhibitor on Corrosion Behavior of Q235 Pipeline Steel for Construction. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 1041-1048.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.372 OR https://www.jcscp.org/EN/Y2023/V43/I5/1041

Fig.1 Potentiodynamic polarization curves of Q235 steel covered by sediments with different concentrations of water-soluble inhibitors

Table 1 Corrosion potential, corrosion current and slow release efficiency of samples with different concentrations of water-soluble inhibitors

Fig.2 Time-varying electrochemical impedance spectra of sediment-covered Q235 steel with different concentrations of water-soluble inhibitors: (a, b) 0 h, (c, d) 24 h, (e, f) 48 h, (g, h) 96 h, (i, j) 144 h

Fig.3 Equivalent circuit used to fit the electrochemical impedance spectrum in Fig.2

Fig.4 Corrosion product resistance (a) and charge transfer resistance (b) of sediment-covered Q235 steel for 6 d after the addition of different con-centrations of inhibitors

Fig.5 Potential (a) and current distribution (b) of sediment-covered Q235 steel without inhibitor

Fig.6 Potential (a) and current distribution (b) of sediment-covered Q235 steel with 8 mg/L inhibitor

Fig.7 Potential (a) and current distribution (b) of sediment-covered Q235 steel with 15 mg/L inhibitor

Fig.8 Potential (a) and current distribution (b) of sediment-covered Q235 steel with 25 mg/L inhibitor

Fig.9 Macroscopic corrosion morphologies of sediment-covered Q235 steel after 168 h immersion: (a) without inhibitor, (b) 8 mg/L, (c) 15 mg/L, (d) 25 mg/L

Fig.10 Surface morphology of corrosion scales of sediment-covered Q235 steel after 168 h immersion: (a) without inhibitor, (b) 8 mg/L, (c) 15 mg/L, (d) 25 mg/L

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