Abstract
An electrochemical investigation of the corrosion on AISI 316 austenitic stainless steel and AISI 1010 carbon steel in sodium chloride solution (3.0 wt.%) was performed in the absence and presence of imidazole and benzimidazole corrosion inhibitors. The results showed that at any inhibitor concentration (25 ppm to 1000 ppm), there was an increase in the polarisation resistance of both steels. The highest efficiency of corrosion inhibition was obtained using imidazole at a concentration of 50 ppm for both steels, with values of 96% for the AISI 316 stainless steel and 73% for the AISI 1010 carbon steel.
Highlights
Corrosion as a destructive phenomenon incurs a high cost to the economy and society
This paper investigated the corrosion of AISI 316 austenitic stainless steel and AISI 1010 carbon steel in solutions containing 3.0 wt% chloride ions and the efficiency of corrosion inhibition of benzimidazole and imidazole inhibitors in different concentrations
The morphological and compositional analyses were performed by Laser-induced plasma emission spectroscopy (LIPS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX), and the electrochemical study was performed by potentiodynamic polarisation
Summary
Corrosion as a destructive phenomenon incurs a high cost to the economy and society. The costs have been estimated to be as high as 5% of GDP in many developed countries [1] [2]. This inhibition efficiency is usually attributed to the specific interactions that occur between functional groups and heteroatoms with the metal surface due to their lone pair electrons [20] and the influence on the change of corrosion potential [20] [21] Certain organic compounds, such as thiophene derivatives, were studied as corrosion inhibitors for AISI 316 stainless steel in acid media with chloride ions and resulted in an efficiency of approximately 97% [22]. Other investigations using computer simulations of new imidazole derivatives showed that these compounds possess the ability to inhibit the corrosion process on AISI 1010 carbon steel, which showed 62.8% inhibition efficiency [25] Other organic inhibitors such as benzimidazole and its derivatives have been reported in the literature as effective corrosion inhibitors with structural features that allow adsorption to the metal surface [26] [27]. The morphological and compositional analyses were performed by Laser-induced plasma emission spectroscopy (LIPS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX), and the electrochemical study was performed by potentiodynamic polarisation
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