article · ACS Omega
Carbon steel exposed to acidic environments degrades rapidly, presenting severe operational challenges. An investigation into the organic compound 2-(2,4,5-trimethoxybenzylidene) hydrazine carbothioamide, known as TMBHCA, demonstrates its capability to mitigate the corrosion of steel in a one molar hydrochloric acid solution. Electrochemical and weight loss evaluations indicate that the compound operates as a mixed-type inhibitor, achieving a peak inhibition efficiency of 97.8 percent at a concentration of 200 parts per million. As the concentration rises, charge transfer resistance increases alongside a decline in double-layer capacitance. Prolonged exposure testing over 28 days shows that protective performance improves substantially over time, climbing from 45.16 percent on the first day to 92.43 percent by day 28. Surface microscopy and quantum chemical assessments confirm that this enhanced durability stems from the gradual, sustained accumulation of protective inhibitor molecules onto the metal surface.
Acidic solutions used across manufacturing and processing industries severely corrode carbon steel infrastructure. Finding chemical additives that effectively shield steel surfaces without losing efficacy over time is essential for equipment durability. Demonstrating an inhibitor that actually increases its protective capability over a month of continuous acid exposure offers a compelling route to prolonging the working lifespan of steel components in aggressive environments.
The compound is targeted as a protective additive for carbon steel exposed to hydrochloric acid in diverse industrial applications. Potential users include maintenance teams and chemical formulators serving facilities with acid-contact operations. The technology currently sits at an early, laboratory-validated stage, having proven its performance through bench-scale electrochemical testing, surface imaging, and 28-day immersion tests, though it has not yet progressed to pilot trials or commercial formulation testing.
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This study investigates the inhibitory effects of 2-(2,4,5-trimethoxy benzylidene) hydrazine carbothioamide (TMBHCA) on the corrosion of carbon steel in a 1 M HCl solution across various concentrations. The assessment employs a comprehensive approach, combining gravimetric analysis, potentiodynamic polarization tests, and electrochemical impedance spectroscopy (EIS). Additionally, scanning electron microscopy (SEM) and quantum chemical calculations are employed to provide a thorough understanding of the corrosion inhibition mechanism. The influence of exposure time on mild steel corrosion is systematically examined. Results reveal a remarkable reduction in the corrosion rate of steel, with TMBHCA demonstrating its highest inhibition efficiency of 97.8% at 200 ppm. Potentiodynamic polarization studies characterize TMBHCA as a mixed-type inhibitor, while Nyquist plots illustrate increased charge transfer resistance and decreased double-layer capacitance with escalating TMBHCA concentrations. Consistency between weight loss measurements and electrochemical findings further validates the efficacy of TMBHCA as a corrosion inhibitor. SEM images substantiate and visually support the obtained results. An immersion test conducted at 25 °C over 28 days showcases a notable enhancement in TMBHCA efficiency (IE%) from 45.16% to 92.43% at 200 ppm as the immersion period progresses from 1 day to 28 days. This improvement is attributed to the augmented adsorption of inhibitor molecules on the steel surface over time. These comprehensive findings significantly contribute to our understanding of TMBHCA's corrosion inhibition behavior, emphasizing its potential as a highly efficient corrosion inhibitor for diverse industrial applications.
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DOI: 10.1021/acsomega.3c10240
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