Corrosion Behavior and Corrosion Inhibitor for Copper Artifacts in CO2 Environment

doi:10.11902/1005.4537.2022.298

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (5): 1049-1056 DOI: 10.11902/1005.4537.2022.298

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Corrosion Behavior and Corrosion Inhibitor for Copper Artifacts in CO₂ Environment

ZHOU Hao¹, YOU Shijie², WANG Shengli²(

)

^1.Conservation Center, Shanghai Museum, Shanghai 200231, China
^2.State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China

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Abstract

Carbon dioxide (CO₂) is a gaseous pollutant found in museums that can seriously damage the original appearance of copper artifacts through local acidification and corrosion. Aiming to simulate the CO₂induced corrosion of the real copper artifacts, a quartz-crystal microbalance (QCM) in conjunction with corrosion products analysis techniques is used to reveal the initial corrosion behavior and regularities of Cu in the CO₂ containing environment. Furthermore, vapor-phase corrosion inhibitors (VCI) compounded with benzotriazole (BTA) and L-cysteine (CYS) were specifically formulated to improve the anti-corrosion ability of Cu. In this work, we investigated the anticorrosive mechanism of VCI on Cu by means of electrochemical impedance spectroscopy (EIS) technology and density functional theory (DFT). The results demonstrated that with the increase of CO₂ concentration and relative humidity content of the environment, the Cu corrosion was accelerated, and the initial corrosion products consist mainly of Cu₂O, CuO and CuCO₃∙Cu(OH)₂after exposure to CO₂ environment. BTA and CYS have significant synergistic anti-corrosion performance for Cu. When the compound radio of BTA to CYS is 4∶1, the highest corrosion inhibition efficiency is 86.2%. Which may be ascribed to that the CYS molecular with relatively smaller size can fully fill the defects of the BTA film, thus causing a greater densification of the anti-corrosion film.

Key words: copper relics CO₂ atmosphere environment corrosion mechanism quartz crystal microbalance vapor corrosion inhibitor

Received: 26 September 2022 32134.14.1005.4537.2022.298

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51671117)

Corresponding Authors: WANG Shengli, E-mail: tckitten@163.com

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Cite this article:

ZHOU Hao, YOU Shijie, WANG Shengli. Corrosion Behavior and Corrosion Inhibitor for Copper Artifacts in CO₂ Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 1049-1056.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.298 OR https://www.jcscp.org/EN/Y2023/V43/I5/1049

Fig.1 Copper-coated quartz crystal

Fig.2 Frequency and mass (a), corrosion rate (b) vs time curves of copper-coated quartz crystal (T=25 °C, RH=90%, C $C O 2$ =3.6 mg·L^-1)

Fig.3 Frequency (a, c) and corrosion rate (b, d) vs time curves of copper-coated quartz crystals under different CO₂ concentrations (a, b) and RH (c, d)

Fig.4 XPS spectra of copper-coated quartz crystals under different exposure conditions: (a) XPS survey, (b) Cu 2p

Fig.5 Nyquist plot of Cu with different proportion of BTA-CYS (a) and equivalent circuit without (b) and with (c) VCI

Table 1 EIS parameters for copper with different proportion of BTA-CYS

Fig.6 Optimized geometries (a, d) and distributions of HOMO (b, e), LUMO (c, f) orbitals of BTA (a-c) and CYS (d-f)

Table 2 Quantum chemical and molecular dynamics parameters derived for BTA and CYS molecules calculated with DFT method

Fig.7 Corrosion inhibition mechanism of BTA-CYS on copper: (a) low CYS concentration, (b) high CYS concentration

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