The Effect of Molecular Structure on the Inhibition of Corrosion of Mild Steel in Hydrochloric Acid Medium by 1-[(4-methoxyphenyl) (Morpholino-4- Yl)methyl]urea

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The preprint studied how the molecular structure of a specific Mannich base, 1-[(4-methoxyphenyl)(morpholino-4-yl)methyl]urea (MMPU), inhibits corrosion of mild steel in a hydrochloric acid medium, using a set of weight-loss experiments (at room and elevated temperatures), gasometric measurements, potentiodynamic polarization, and electrochemical impedance spectroscopy. The paper’s key intended finding is that electron-donating substituents on the phenyl ring influence electrostatic interactions and chemisorption, with corrosion inhibition performance interpreted through polarization parameters, impedance-derived charge transfer resistance and double-layer capacity, and adsorption isotherm behavior inferred from surface coverage. It plans to support the proposed inhibition mechanism with scanning electron microscopy comparing corroded and inhibited metal surfaces. As a major caveat, it is a non-peer-reviewed Research Square preprint. Relevance to endometriosis: The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

Abstract The versatile chemistry of Mannich bases offers many opportunities for creating tailor-made molecular structures suited to different needs by simple and relatively inexpensive procedures that can be readily carried out. The choice of the Mannich base, namely, 1-[(4-methoxyphenyl)(morpholino-4-yl)methyl]urea (MMPU), has been primarily based on the idea of a clear picture of the role of electron-donating nature of the substituents groups in phenyl ring of the Mannich bases that chiefly govern the electrostatic interaction and chemisorption which decides the inhibition performance of the compounds. The standard weight loss studies, gasometric, potentiodynamic polarization and impedance studies form the methodology of the experimental approaches. The weight loss techniques to be studied at room temperature and elevated temperatures will be useful in determining the inhibition efficiency of the compounds. The polarization studies are intended to evaluate the corrosion potential, corrosion current and Tafel slopes, which will help to propose a suitable mechanism of inhibition. The charge transfer resistance and double-layer capacity values are to be calculated through impedance measurement. The surface coverage values calculated from the weight loss techniques will help to propose a suitable adsorption isotherm that characterizes the adsorption process which is primarily responsible for the inhibition process. The surface examination of the metal specimen both under corroded and inhibited conditions is to be made through Scanning Electron Microscopic (SEM) studies. The performance of the compounds is to be identified based on the above experimental results and correlated with the structural and electronic effects. This will help us to have a clear insight into the process of inhibition and performance of the compounds which culminate in the identification of some potential pickling inhibitors.
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The Effect of Molecular Structure on the Inhibition of Corrosion of Mild Steel in Hydrochloric Acid Medium by 1-[(4-methoxyphenyl) (Morpholino-4- Yl)methyl]urea | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article The Effect of Molecular Structure on the Inhibition of Corrosion of Mild Steel in Hydrochloric Acid Medium by 1-[(4-methoxyphenyl) (Morpholino-4- Yl)methyl]urea Anwar Sathiq M This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4753758/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract The versatile chemistry of Mannich bases offers many opportunities for creating tailor-made molecular structures suited to different needs by simple and relatively inexpensive procedures that can be readily carried out. The choice of the Mannich base, namely, 1-[(4-methoxyphenyl)(morpholino-4-yl)methyl]urea (MMPU), has been primarily based on the idea of a clear picture of the role of electron-donating nature of the substituents groups in phenyl ring of the Mannich bases that chiefly govern the electrostatic interaction and chemisorption which decides the inhibition performance of the compounds. The standard weight loss studies, gasometric, potentiodynamic polarization and impedance studies form the methodology of the experimental approaches. The weight loss techniques to be studied at room temperature and elevated temperatures will be useful in determining the inhibition efficiency of the compounds. The polarization studies are intended to evaluate the corrosion potential, corrosion current and Tafel slopes, which will help to propose a suitable mechanism of inhibition. The charge transfer resistance and double-layer capacity values are to be calculated through impedance measurement. The surface coverage values calculated from the weight loss techniques will help to propose a suitable adsorption isotherm that characterizes the adsorption process which is primarily responsible for the inhibition process. The surface examination of the metal specimen both under corroded and inhibited conditions is to be made through Scanning Electron Microscopic (SEM) studies. The performance of the compounds is to be identified based on the above experimental results and correlated with the structural and electronic effects. This will help us to have a clear insight into the process of inhibition and performance of the compounds which culminate in the identification of some potential pickling inhibitors. Mannich Base Mild Steel Hydrochloric acid Corrosion Picking inhibitors Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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