Abstract
The corrosion inhibition of C-steel in 1 M HCl was assessed using three newly synthesized hydrazide derivatives (H1, H2 and H3) using weight loss (WL), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques. Also, the adsorption of these compounds was confirmed using several techniques such as atomic force microscopy (AFM), Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). High inhibition efficiencies were obtained resulting from the constitution of the protective layer on the C-steel surface, which increased with increasing concentration and temperature and reached 91.7 to 96.5% as obtained from the chemical method at 20 × 10−6 M at 45 °C. The polarization curves refer to these derivatives belonging to mixed-type inhibitors. The adsorption of (H1, H2 and H3)on the CS surface follows the Temkin adsorption isotherm. Inhibition influence of hydrazide derivatives at the molecular level was greatly proven using quantum chemical calculations and Monte Carlo simulation methods. Furthermore, the molecular simulation results evidenced the adsorption of these derivatives on the carbon steel surface.
Highlights
Corrosion is the natural destruction of a material due to reaction with its surroundings
During the rust removal from the Carbon steel (C-steel) surface process, as an example, C-steel material needs to be immersed in an acidic solution such as hydrochloric acid (HCl), which cleans the surface from rust and other scales, this process is known as acid pickling
Weight loss (WL) tests were conducted for H1, H2 and H3 compounds and corrosion rates of carbon steel were estimated
Summary
Corrosion is the natural destruction of a material due to reaction with its surroundings It is a natural, slow, continuous, and spontaneous process. It cannot be avoided, but it can be mitigated by several techniques such as reducing the aggressiveness of media, using inhibitors, cathodic, anodic protection and applying preventive coatings.[1,2] Several processes place C-steel adjacent to corrosive media, such as chemical plants, petroleum re neries and power plants. A er rust removal, HCl continues to attack the original metal and dissolves it, a corrosion inhibitor is needed to stop or mitigate the acid in uence on the C-steel surface.[3] The inhibitor molecules cover the C-steel surface and prevent acid from further metal dissolution. The adsorption of inhibitors occurs by two mechanisms; rst is physisorption, which results from electrostatic interactions between opposite charges on the metal surface and inhibitor molecules, and the second type is
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