Adsorption dynamics and corrosion inhibition of iron in acid solutions by acetylenic alcohols /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1990.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | A systematic investigation of the adsorption and corrosion inhibition of iron in acid solutions by acetylenic alcohols was carried out by using various spectroscopic and electrochemical techniques with the objective of establishing the relationships between the interfacial structure and reaction kinetics at the molecular level for a practical corrosion system. On the Interfacial Structure: The interfacial kinetic processes of adsorption of l-octyn-3-ol, l-hexyn-3-ol, 3-butyn-2-ol, 2-propyn-l-ol, l-phenyl-2-propyn-l-ol, 3-methyl-l-penten-4-yn-3-ol, 2- butyn-l-ol, 3-butyn-l-ol, 2-butyn-l,4-diol, l,5-hexadien-3-ol, l-hexen-3-ol and phenol on Fe in acid solutions were studied in detail by in situ time-resolved automatic ellipsometry. The time, concentration, potential and temperature dependencies of the adsorption, the subsequent orientation transition, and polymer growth of the adsorbed layers formed by these compounds were determined. The chemical nature of the adsorbed layers was further examined by X-ray photoelectron spectroscopy (XPS), Fourier transform IR (FTIR) spectroscopy and 252Cf plasma desorption mass spectrometry ([^252]Cf-PDMS). A new method based on the Lorentz-Lorenz equation is deduced for calculating the surface packing density of an adsorbed organic compound with a certain orientation on an electrode surface from ellipsometric data in the submonolayer and monolayer region. Using this method, useful correlation between the molecular structure and the corresponding surface packing density is obtained. The effects of chloride ions on the adsorption of l-octyn-3-ol on Fe were quantified by time-resolved ellipsometry, XPS and [^36]Cl-radiotracer technique. A comprehensive analysis of adsorption at electrode-solution interfaces under steady state and equilibrium conditions is also given. On the Corrosion Reaction Kinetics: The mechanism of corrosion inhibition of iron by acetylenic alcohols in acid solutions was established by relating the interfacial structure obtained from spectroscopic measurements with the corrosion reaction kinetics obtained from electrochemical measurements. A modified adsorption-interaction model was found to be applicable for describing the hydrogen evolution reaction on an inhibitor-covered iron electrode. For the iron dissolution reaction, a parallel dissolution model was found to be applicable... |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Chemistry." |
| Physical Description: | 2 volumes : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |