R. Annand, R. M. Hurd, N. Hackerman
Feb 1, 1965
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Journal
Journal of The Electrochemical Society
Abstract
The adsorption of 4-ethylpyridine, 4-ethylpiperidine, and very low molecular weight poly (4-vinylpyridines) was studied in cyclohexane solutions containing hydrogen reduced steel powder. Isotherms were obtained for the monomers at 30$C. They show that an amount equivalent to monolayer formation is absorbed at equilibrium concentrations in the range 2.5 to 5.0 x 10U-3DM. The polymer was adsorbed to a much greater extent. Using a specially designed chromatographic method, the heat of adsorption of the piperidine derivative from cyclohexane was determined. Simultaneous measurements of the adsorption of the polymer and the corrosion of the steel in aqueous hydrochloric acid have shown that the corrosion rate decreases by 80% as the polymer adsorbs to form a very incomplete layer. From these results, it is concluded that these compounds chemisorb to the steel surface and that the 4-ethylpiperidine is bonded at the nitrogen atom, but that the 4-ethlpyridine is adsorbed in a position with the plane of the ring parallel to the steel surface. (13 refs.)