Surface analysis and interface properties of 2-aminobenzimidazole corrosion inhibitor for brass in chloride solution
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RESEARCH PAPER
Surface analysis and interface properties of 2-aminobenzimidazole corrosion inhibitor for brass in chloride solution Matjaž Finšgar 1 Received: 8 July 2020 / Revised: 23 September 2020 / Accepted: 30 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This work presents a corrosion study of 2-aminobenzimidazole (ABI) as a corrosion inhibitor for brass in chloride solution. Electrochemical, field emission scanning electron microscopy, atomic force microscopy, and contact angle measurements showed that ABI mitigates brass corrosion after short-, medium-, and long-term immersion periods. Next, a detailed surface analysis of the ABI adsorbed on the brass surface was performed using attenuated total reflectance Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), and time-of-flight secondary ion mass spectrometry (ToF-SIMS) techniques. XPS imaging was performed in association with principal component analysis to determine the different phases on the surface. In order to describe the in-depth composition of the ABI surface, an angle-resolved XPS analysis was performed. This analysis was further supported by gas cluster ion beam sputtering to gradually remove the ABI surface layer, and XPS analysis was performed after each sputtering cycle. Finally, TOF-SIMS analyses showed the formation of Cu/Cu2-ABI and Zn-ABI compounds, the 2D distribution of ABI-related compounds, and their thermal stability on the brass surface. Keywords 2-Aminobenzimidazole . Brass . Corrosion inhibitor . ToF-SIMS . GCIB-XPS . Surface analysis
Introduction Time-of-flight secondary ion mass spectrometry (ToF-SIMS) and X-ray photoelectron spectroscopy (XPS) are currently the most useful techniques to study very thin surface layers [1–5]. A corrosion inhibitor is a chemical compound that adsorbs on the metallic surface, forms a very thin surface layer, and starts to mitigate corrosion. Therefore, in order to study corrosion inhibitor/metallic surface interface properties, ToF-SIMS and XPS surface analytical techniques are crucial. By knowing the interface properties, the design of new corrosion inhibitor compounds and corrosion inhibitor formulations are facilitated. Frequently, organic compounds are employed as corrosion inhibitors. When these organics adsorb on the metallic surface, such surface analysis becomes challenging as an Supplementary Information The online version of this article (https:// doi.org/10.1007/s00216-020-02981-2) contains supplementary material, which is available to authorized users. * Matjaž Finšgar [email protected] 1
Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
organic/metal interface is formed. Lately, with the development of the gas cluster ion beam (GCIB) sputtering source technique, the gradual removal of such surface layer without causing chemical changes to the organic surface layer is possible [6]. Brass is technologically a very important material in industry [7–17];
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