Synthesis and corrosion inhibition performance of a nitrogen- and phosphorus-containing inhibitor for carbon steel
نویسندگان
1 Department of Chemical Engineering, Termez State University of Engineering and Agrotechnologies, P. O. Box: 190100, Termez, Uzbekistan.
2 Termez State University, P. O. Box: 190111, Termez, Uzbekistan.
3 5Department of Pediatric Surgery, Urology, Pediatric Urology, Anesthesiology and Resuscitation, Pediatric Anesthesiology and Resuscitation, Tashkent State Medical University, Tashkent, Uzbekistan.
4 Scientific Research Center, Termez State University, P. O. Box: 190100, Termez, Uzbekistan.
5 Department of Natural Sciences, Turan University, Uzbekistan.
6 Department of Medical and Biological Chemistry, Termez Branch of Tashkent State Medical University, P. O. Box: 190100, Termez, Uzbekistan.
7 Theoretical Mechanics Department, Mechanical Engineering Faculty, Tashkent State Technical University, P. O. Box: 100179, Tashkent, Uzbekistan.
8 Department of Chemical Engineering, Termez State University of Engineering and Agrotechnologies, P. O. Box: 190100, Termez, Uzbekistan.
9 Department of Uzbek and Foreign Languages, Termez Branch of Tashkent State Medical University, P. O. Box: 190100, Termez, Uzbekistan.
10 Department of Languages, Samarkand State Medical University, Samarkand, Uzbekistan.
doi
10.22034/crl.2026.578785.1805چکیده
In this article, we study the synthesis and evaluation of a novel compound derived from di(thio)amidophosphates and epichlorohydrin, designed as a potential corrosion inhibitor. The synthesis was optimized under a molar ratio of 1:1 of the starting materials, a reaction temperature of 100 °C, and a reaction time of 2.5–3 h, achieving yields between 93.6 and 96.3 %. Structural characterization by elemental analysis and IR spectroscopy supported the formation of functional groups responsible for corrosion inhibition, including P=O, P–H, C=O, and C=S groups. The corrosion inhibition performance was studied using combined experimental methods using gravimetric, electrochemical polarization, and surface analysis techniques. In 1 M HCl solution, potentiodynamic polarisation (PDP) measurements revealed a substantial reduction in corrosion current density (icorr) from 10.96 mA cm⁻² in the uninhibited system to 0.71 mA cm⁻² at an inhibitor concentration of 150 mg L⁻¹, corresponding to a maximum inhibition efficiency (ηPDP) of 94.86 %. Additional gravimetric tests in CO₂- and H₂S-saturated NaCl solutions demonstrated inhibition efficiencies ranging from 86 to 97.5 %, depending on pH, gas pressure, and inhibitor concentration. SEM and AFM analyses confirmed the formation of a compact, uniform protective film on the steel surface. These findings indicate that the synthesized compound exhibits strong potential as an effective corrosion inhibitor for industrial applications, providing a promising approach for the protection of metals under aggressive environmental conditions.
