Abstract
The main focus of current research is on the synthesis and anticorrosive activity of novel heterocyclic compounds tert-butyl 4-[(4-methyl phenyl) carbonyl] piperazine-1-carboxylate [TBMPCPC]. Electrochemical, quantum chemical, and surface characterization studies at elevated temperatures (303–333 K) for carbon steel in 1M HCl solution studied this molecule's corrosion inhibition property. It is observed from the results of electrochemical studies that the TBMPCPC may be able to effectively protect the steel plate surface with an inhibition efficiency of 91.5 % at 25 ppm in corrosive media. The corrosion inhibition depends on concentration, as concentration also increases inhibition efficiency due to the strong and spontaneous adsorption on the metal's surface. The Tafel polarization measurements concluded that the inhibitor works as a mixed form to protect the carbon steel in the bulk solution from corrosion. The adsorption of the TBMPCPC onto the metal surface was in reliable with the isothermal model of the Langmuir adsorption. The scanning electron microscopy clearly showed that the inhibitor was substantially deposited on the metal surface, indicating substantial inhibition. The surface morphology of carbon steel in the absence and existence of an inhibitor in 1 M HCl is also studied using the Atomic Force Microscopic method.
Highlights
Carbon steel is a crucial iron alloy and is primarily used in many fields of industry and construction
The novel tert-butyl 4-[(4-methyl phenyl) carbam oyl] piperazine-1carboxylate (TBMPCPC) heterocyclic molecule derived from the 4methyl phenyl isocyanate and N-Boc piperazine reaction was our primary target compound to be used in corrosion inhibition measurements, in which it serves as a corrosive media inhibitor
Using VEGA3 TESCAN Scanning electron microscopic (SEM), SEM micrographs of steel strips immersed in 1 M HCl solution without and with TBMPCPC were reported at an accelerating beam of 25 kV
Summary
Carbon steel is a crucial iron alloy and is primarily used in many fields of industry and construction. Carbon steel is used due to its high thermal stability and excellent mechanical properties in the petroleum industry, storage containers, and reaction vessels In these areas, metal surfaces in pickling, decaling, acid washing, and other applications [1, 2] are exposed to aggressive media, causing corrosion, resulting in the loss of the metal content of the devices as described above. Due to the absence of a chromium or cyanide group in the molecule, our chosen new urea derivative is non-toxic It serves as an effective corrosion inhibitor for carbon steel in 1M HCl. The corrosion parameters were discussed using electrochemical experiments and surface morphology; the corrosion parameters were examined. Figure 1. 1H NMR spectra of tert-butyl 4- [(4-methyl phenyl) carbanoyl] piperazine-1-carboxylate
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