Abstract
Most studies on the corrosion inhibition performance of organic molecules and (nano)materials were conducted within “carbon steel/1.0 M HCl” solution system using similar experimental and theoretical methods. As such, the numerous research findings in this system are sufficient to conduct comparative studies to select the best-suited inhibitor type that generally refers to a type of inhibitor with low concentration/high inhibition efficiency, nontoxic properties, and a simple and cost-economic synthesis process. Before data collection, to help readers have a clear understanding of some crucial elements for the evaluation of corrosion inhibition performance, we introduced the mainstay of corrosion inhibitors studies involved, including the corrosion and inhibition mechanism of carbon steel/HCl solution systems, evaluation methods of corrosion inhibition efficiency, adsorption isotherm models, adsorption thermodynamic parameters QC calculations, MD/MC simulations, and the main characterization techniques used. In the classification and statistical analysis section, organic compounds or (nano)materials as corrosion inhibitors were classified into six types according to their molecular structural characteristics, molecular size, and compound source, including drug molecules, ionic liquids, surfactants, plant extracts, polymers, and polymeric nanoparticles. We outlined the important conclusions obtained from recent literature and listed the evaluation methods, characterization techniques, and contrastable experimental data of these types of inhibitors when used for carbon steel corrosion in 1.0 M HCl solution. Finally, statistical analysis was only performed based on these data from carbon steel/1.0 M HCl solution system, from which some conclusions can contribute to reducing the workload of the acquisition of useful information and provide some reference directions for the development of new corrosion inhibitors.
Highlights
Corrosion inhibitor selection is based on the metal substrate and the surrounding environment, while at the same time, their economy, efficacy, and environmental factors should be considered
This is already explained in the literature, in which physical interaction refers to inhibitor molecule adsorption on a metal surface through van der Waals forces or Coulombic forces between them, while chemical interaction means that sulfur (S), nitrogen (N), phosphorus (P), oxygen (O), and conjugated groups contained within organic inhibitors act as adsorption centers that link the inhibitor to the metal surface [17]
The results showed that Epitt moved toward the noble (+) direction as the concentration of nutmeg oil increased, which indicated that the pitting attack was reduced, and nutmeg oil could be used as an excellent pitting corrosion inhibitor for L-52 carbon steel
Summary
Metal corrosion is a localized electrochemical reduction–oxidation reaction occurring on its surface, in which electrons are released due to metal dissolution and transferred to a different location on the surface to reduce hydrogen ions. For an acidic solution, the electric potential is caused by the accumulation of excess electrons generated in the anode, which can be neutralized at the cathodic site by the reduction of H+ to form hydrogen gas This process can be presented as follows (Equations (8)–(10)) [25]. As expected, both ρHE and ρML increase with increasing HCl concentration, indicating acceleration behavior for mild steel dissolution. The k value represents the corrosion rate when the acid concentration is equal to unity
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