Computational Intelligence in Healthcare 4 Advanced Methodologies
This book is a continuation of the volumes providing various per-spectives on computational intelligence in healthcare [1-3]. This book is aimed to provide a sample of the state of art in the prac-tical applications of computational intelligence paradigms
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STIGATION METHODS FOR PHYSICOCHEMICAL SYSTEMS
Fourier Transform Infrared Spectroscopy in LongTerm Corrosion Monitoring of the Interaction between a Commercial Aluminum Sheet and Carbon Tetrachloride at Room Temperature I. A. Gagina, N. P. Sokolova, N. P. Platonova, V. A. Kotenev, and A. Yu. Tsivadze Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991 Russia email: m[email protected] Received December 10, 2010
Abstract—The possibilities of diffuse and specular reflectance Fouriertransform infrared spectroscopy in longterm corrosion monitoring are studied. A 15week period of interaction between carbon tetrachloride and a commercial aluminum sheet is followed. Analysis of the results obtained reveals a complex and multi stage character of the interaction between CCl4 and aluminum surface. The final product of the reaction is shown to be chlorinecontaining hydrocarbon, which is strongly bound to the metal surface. DOI: 10.1134/S2070205112050036
INTRODUCTION Identification of surface compounds on metals is important for the diagnosis of corrosion destruction [1]. In the case of corrosion, several reactions can pro ceed concurrently, and some of them may have an induction period. Hence, it is necessary to study the surface state not only at the early and late stages, but also at intermediate stages. Solving the task requires methods that enable one to monitor the corrosion pro cess continuously within a long time period [2–4]. This is especially significant in the case of corrosion monitoring of structural materials (e.g., aluminum and aluminum alloys) in the aircraft industry, where the durability of protective and strength characteristics is of primary importance. Analytical spectroscopic methods, including infra red and Raman spectroscopy, are widely used for studying physicochemical systems [5, 6], but not as much used in corrosion monitoring and longterm corrosion experiments. In the latter case, substantially simplified (in implementation and interpretation) methods—particularly gravimetric [2], microscopic [7], laseroptical [4], photoelectric [8], and some other approaches—are usually applied. However, today, infrared and Raman spectroscopy are becoming more available. This makes it possible to solve prob lems of corrosion monitoring at the analytical level (composition, structure, and contents in a corrosion product layer), rather than at the quantitative gross level solely (standard gravimetric data for the corro sion product judged from the total gain or loss in weight of the corroded metal), especially when the method is combined with conventional techniques of corrosion studies.
Carbon tetrachloride is a chemically inert com pound, which is resistant to atmospheric effects and concentrated sulfuric acid and can be used as a raw material in the production of chlorinecontaining substances, as an industrial solvent, a reagent in fire fighting, etc. It is also used in the oilprocessing indus try, in synthesis of fluor
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