Abstract
The work presents a comprehensive vibrational analysis of the process of adsorption of threonine (Thr) onto an Fe surface with deposited Cu nanoparticles (NPs) (of about 4–5 nm in size) in a corrosive environment. The application of surface-enhanced Raman spectroscopy (SERS) and surface-enhanced infrared absorption spectroscopy (SEIRA) provides the opportunity for detailed description of adsorption geometry of amino acid onto a metal surface. The combination of conventional infrared spectroscopy (IR) with atomic force microscopy (AFM) resulted in a nano-SEIRA technique which made it possible to provide a precise description of adsorbate binding to the metal surface. The studies presented confirmed that there is a very good correlation between the spectra recorded by the SERS, SEIRA, and nano-SEIRA techniques. Threonine significantly influenced the process of corrosion of the investigated surface due to the existing strong interaction between the protonated amine and carboxylate groups and the CuNPs deposited onto the Fe surface. In addition, the application of two polarization modulations (s and p) in nano-SEIRA allows subtle changes to be observed in the molecule geometry upon adsorption, with the carboxylate group of Thr being almost horizontally oriented onto the metal surface; whereas the amine group that contains nitrogen is oriented perpendicular to this surface.
Highlights
IntroductionA lot of corrosion inhibitors used for the inhibition of corrosion cause health hazards [1,2]
Metal materials are exposed to aggressive media and are prone to corrosion
The evaporated atoms collide with the gas atoms, lose kinetic energy, and form nanoparticles
Summary
A lot of corrosion inhibitors used for the inhibition of corrosion cause health hazards [1,2]. Providing a description of the process of adsorption of amino acids onto metallic surfaces in an aggressive environment is of great significance in order to understand the mechanism of their anticorrosive effect [4,5,6]. There is a lot of research in which amino acids have been reported to be an effective corrosion inhibitor in various aggressive media [3,7,10,11]. The corrosion inhibition effect of threonine (Thr) on the corrosion of copper (Cu) in hydrochloric acid (HCl) has been investigated by different research groups [10,11]
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