Benzotriazole as a volatile corrosion inhibitor during the early stage of copper corrosion under adsorbed thin electrolyte layers

• Published in: Corrosion science Vol. 65; pp. 214 - 222
• Main Authors: Chen, Zhenyu, Huang, Ling, Zhang, Guoan, Qiu, Yubing, Guo, Xingpeng
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-12-2012; Elsevier
• Subjects: A. Copper; ANODES; Applied sciences; B. AFM; B. EIS; B. XPS; Benzotriazole; C. Atmospheric corrosion; C. Neutral inhibition; Copper; COPPER OXIDE; CORROSION; Corrosion environments; CORROSION INHIBITORS; Corrosion prevention; CUPROUS OXIDE; Electrolytes; Exact sciences and technology; Inhibition; Metals. Metallurgy; Reflectance; THIN FILMS; TRIAZOLE; B. XPS; B. AFM; C. Atmospheric corrosion; B. EIS; A. Copper; C. Neutral inhibition; Atomic force microscopy; Early stage; Corrosion protection; Corrosion product; Corrosion inhibitor; Photoelectron spectrometry; Impedance; Benzotriazole; Atmospheric corrosion
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2012.08.019

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► Inhibition effect under adsorbed thin electrolyte layer is investigated. ► Copper corrosion process is found under the control of CuCl2− mass-transport. ► An adsorption model of benzotriazole on copper surface is proposed.
The inhibition effect of benzotriazole (BTAH) during the early stage of copper corrosion under adsorbed thin electrolyte layers (ATEL) was investigated. Electrochemical data show that BTAH suppressed the anodic corrosion reaction and inhibited copper corrosion under ATEL. The surface was examined by using a scanning electron microscopy, in situ atomic force microscopy, X-ray photoelectron spectroscopy, and attenuated total reflectance Fourier-transform infrared measurements. The inhibition of BTAH is attributed to its quick interaction with Cu(0) that formed a thin protective film in non-corroded areas and interaction with Cu(I) that formed a complex on Cu2O substrate in defect sites.