article · Journal of Adhesion Science and Technology
This study investigates the protective performance of an organic compound, known as DBDB, against the corrosion of carbon steel and associated hydrogen gas generation in a hydrochloric acid environment. Laboratory measurements including mass loss, gasometry, potentiodynamic polarisation, and electrochemical impedance spectroscopy were used alongside theoretical quantum calculations to evaluate the compound. The results show that DBDB acts as a mixed-type corrosion inhibitor. Its protective efficacy improves as concentration rises, achieving a peak inhibition efficiency of 97 percent at a concentration of 0.005 M and a temperature of 25 degrees Celsius. The mitigation mechanism relies on the adsorption of the molecules onto the steel surface according to the Langmuir model. Thermodynamic analysis confirmed a mixture of physical adsorption and chemisorption, with adsorption proving more favourable at lower temperatures.
Acids used in industrial processes frequently attack carbon steel equipment, causing rapid degradation and generating hazardous hydrogen gas. Identifying compounds that reliably adhere to metal surfaces and prevent acidic corrosion can reduce infrastructure damage, improve operational safety, and lower equipment replacement costs across manufacturing and processing sectors.
The findings suggest potential application for formulation into chemical corrosion inhibitors used by industries handling acidic solutions with carbon steel infrastructure, such as chemical cleaning or acid pickling operations. Because the data is based strictly on laboratory-scale chemical and electrochemical testing, the technology is at an early research stage and requires further development under operational conditions before commercial deployment.
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AbstractThe mitigation influence of N1-(4-(dimethylamino)benzylidene)-N2-(2-((4-(dimethylamino)benzylidene)amino)ethyl)ethane1,2-diamine, (DBDB) against the corrosion of carbon steel and H2 production in 1.0 M HCl solution was studied. The experimental methods of mass loss, gasometry, potentiodynamic polarization, PDP, and electrochemical impedance spectroscopy, EIS, were utilized. The PDP data confirmed that the DBDB compound attitude is a mixed-type inhibitor. The protection efficacy rises with increasing the added amount of DBDB to reach 97% at 0.005 M concentration and 25 °C. The mitigation process was based on the adsorption of the DBDB molecules on the carbon steel obeying Langmuir's model. Some thermodynamic functions like Kads and ΔG°ads are computed and discussed. The negative sign of ΔG°ads proves the stability of the adsorbed DBDB molecules on the corroded metal surface. The ΔG°ads values vary between −38.70 and −35.13 kJ/mol explaining the existence of both the physical- and chemisorption mixed processes. The lowering in the Kads value with temperature confirms that the adsorption of DBDB compound is favorable at lower temperatures. Theoretical quantum calculations agreed with the experimental data.Keywords: Hydrogen evolutionbenzylidenemass lossimpedancepotentiodynamiccorrosion inhibition AcknowledgmentThe authors would like to extend their appreciation to the Deanship of Scientific Research at the University of Tabuk for funding this work through research group number S-1443-0192.Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationFundingUniversity of Tabuk [S-1443-0192].
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DOI: 10.1080/01694243.2023.2255042
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