Hybrid Corrosion Inhibitor for Anti-corrosion and Protection of Bronze Relics

doi:10.11902/1005.4537.2021.055

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (4): 517-522 DOI: 10.11902/1005.4537.2021.055

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Hybrid Corrosion Inhibitor for Anti-corrosion and Protection of Bronze Relics

ZHOU Hao¹, WANG Shengli², LIU Xuefeng², YOU Shijie²(

)

^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

The effect of a hybrid corrosion inhibitor, namely mixtures of benzotriazole (BTA) and sodium formate (SFA), on the corrosion behavior of bronze in 3% (mass fraction) NaCl solution was assessed by means of CHI760E electrochemical workstation and X-ray photoelectron spectroscopy (XPS) technique. The results demonstrated a satisfied anti-corrosion enhancement effect of SFA, indicated by increased film resistance and interfacial electron-transfer resistance on bronze surface measured by electrochemical impedance spectroscopy. The XPS analysis indicated a major impact of the type of the formed oxides on bronze surface to the formation of Cu-BTA complex. And in the presence of SFA, the corrosion product on bronze surface is dominated by Cu₂O, which is more conductive to the adsorption of BTA and the formation of Cu (I)-BTA complex, thereby improving the corrosion resistance of bronze. This study not only provides a deeper insight into the theoretical basis for the anti-corrosion of bronze, but also suggests an effective approach to protect bronze cultural relics as well.

Key words: bronze relic hybrid corrosion inhibitor anti-corrosion treatment

Received: 18 March 2021

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51671117)

Corresponding Authors: YOU Shijie E-mail: sjyou@hit.edu.cn

About author: YOU Shijie, E-mail: sjyou@hit.edu.cn

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Cite this article:

ZHOU Hao, WANG Shengli, LIU Xuefeng, YOU Shijie. Hybrid Corrosion Inhibitor for Anti-corrosion and Protection of Bronze Relics. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 517-522.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.055 OR https://www.jcscp.org/EN/Y2021/V41/I4/517

Fig.1 SEM images of original sample surface (a) and polished sample surface (b)

Table 1 Proportion of BTA and SFA

Fig.2 Curves of open circuit potential (E_OCP) vs time of bronzes in 3%NaCl solution

Fig.3 Surface corrosion of bronze samples in 3%NaCl after immersed for 24 h

Fig.4 Potentiodynamic polarization curves of bronze samples in 3%NaCl solution

Table 2 Fitted parameters of potentiodynamic polarization curves

Fig.5 EIS comparison of bronze samples in 3%NaCl solution

Fig.6 Electrical equivalent circuit model used to fit the impedance data: (a) #0 and #6; (b) #1~#5

Table 3 Electrical equivalent circuit parameters obtained for bronze samples

Fig.7 XPS spectra of the surface film of bronzes (a) and Cu 2p (b)

Table 4 Surface film composition of bronze sample treated with corrosion inhibitor

Fig.8 Percentage of Cu (II) and Cu (I) on bronze surfaces

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