Corrosion Inhibition of 1, 2, 4-triazaole on Copper in a Stimulated Cooling Water for Synchronous Condenser

doi:10.11902/1005.4537.2023.197

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (3): 772-780 DOI: 10.11902/1005.4537.2023.197

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Corrosion Inhibition of 1, 2, 4-triazaole on Copper in a Stimulated Cooling Water for Synchronous Condenser

FENG Likui¹, CHENG Yijie¹, SONG Xiaoning¹, YU Zhiyong¹, YAN Zixuan², ZHANG Daquan²(

)

1. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China
2. Department of Environment and Chemical Engineering, Shanghai University of Electric Power, Shanghai 201306, China

Cite this article:

FENG Likui, CHENG Yijie, SONG Xiaoning, YU Zhiyong, YAN Zixuan, ZHANG Daquan. Corrosion Inhibition of 1, 2, 4-triazaole on Copper in a Stimulated Cooling Water for Synchronous Condenser. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 772-780.

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Abstract

The effect of a corrosion inhibitor 1.2.4-Triazole (TAZ) on the water quality of a simulated solution of the rotor cooling water and the corrosion inhibition performance for pure Cu-plate were assessed by means of pH meter, conductivity meter and dissolved oxygen analyzer, as well as measurements such as mass loss, dynamic potentiodynamic polarization curve, and electrochemical impedance spectroscopy. The results show that the addition of TAZ can reduce the pH value to a certain extent, but have little effect on the conductivity and dissolved oxygen content of the solution; With the increase of TAZ concentration, the corrosion rate and the corrosion current density for Cu decrease, i.e., its corrosion inhibition efficiency rises. The highest corrosion inhibition efficiency was 99.9% (loss-in-mass method) and 92.0% (EIS method) when the dose of TAZ was 10 mmol/L. The adsorption process on the metal surface was fitted using Langmuir isotherm, which confirmed that the adsorption of TAZ on the copper surface is a mixed adsorption. The theoretical calculations further proved that TAZ has a better adsorption effect on the surface of Cu, which can effectively inhibit the Cu corrosion in the simulated solution. It is expected that TAZ may have better corrosion inhibition performance for Cu in the rotor cooling waters, which is a kind of green corrosion inhibitor in spontaneous adsorption. Thus, the present results may be a meaningful reference for the application of corrosion inhibitor to protect the hollow-core copper conductors in the rotor cooling water for synchronous condenser.

Key words: synchronous condenser corrosion inhibition 1,2,4-Triazole copper coolant

Received: 16 June 2023 32134.14.1005.4537.2023.197

ZTFLH:

TG174

Fund: State Grid Zhejiang Electric Power Co., Ltd(5211DS22000L)

Corresponding Authors: ZHANG Daquan, E-mail: zhangdaquan@shiep.edu.cn

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	FENG Likui
	CHENG Yijie
	SONG Xiaoning
	YU Zhiyong
	YAN Zixuan
	ZHANG Daquan

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.197 OR https://www.jcscp.org/EN/Y2024/V44/I3/772

Fig.1 Ion release rates of copper in the coolant aqueous solutions containing different concentrations of TAZ at 40^oC and inhibition efficiencies of TAZ

Fig.2 pH and dissolved oxygen values (a) and conductivities (b) of Cu before and after 120 h immersion in the coolant aqueous solutions containing different concentrations of TAZ

Fig.3 Fluorescence emissions of Cu before and after immersion in the stimulated cooling waters containing different concentrations of TAZ

Fig.4 OCP (a) and polarization curves (b) of copper in simulated cooling waters with different concentrations of TAZ at room temperature

Table 1 Electrochemical polarization parameters of copper in the simulated cooling water with different concentrations of TAZ

Fig.5 Nyquist (a) and Bode (b) plots of copper electrode in the simulated cooling solutions with different concentrations of TAZ

Fig.6 Equivalent circuit for fitting EIS

Table 2 Fitting parameters of EIS of copper electrode in the simulated cooling solutions with different concentrations of TAZ

Fig.7 Langmuir adsorption isotherm of TAZ and relevant parameters

Table 3 Thicknesses of TAZ films adsorbed on Cu

Fig.8 Shapes of water drops on Cu immersed in the stimulated cooling waters containing 0 mmol/L (a), 5 mmol/L (b), 10 mmol/L (c) and 15 mmol/L (d) TAZ

Fig.9 Quantum chemical calculations of TAZ molecule structure：(a) optimal structure, (b) ESP, (c) HOMO, (d) LUMO

Fig.10 TDOS of pure copper surface (a), PDOS of copper surface with TAZ molecular (b) and Electronic density profile of copper surface and TAZ molecule composite model (c)

Fig.11 Molecular dynamic simulated equilibrium configuration of TAZ adsorption on Cu surface

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