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    Monomolecular Films of Rust-Preventive Additives

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    The first layer of additive molecules in an adsorbed rust-preventive film is the only layer that can react chemically with a metal surface; succeeding layers would be held by weaker physical forces. Film balance studies of monomolecular films show that good film-forming properties and high collapse pressures are characteristic of many rust-preventive compounds. Electron micrographs reveal structural details of monolayers that may be similar to those of adsorbed films on metal surfaces. Adsorption of radiostearic acid from an oil solution onto iron and steel surfaces is initially rapid, but slows down as a monolayer is approached. Any apparent multilayer adsorption may be due to the increased adsorbing surface that results from oxide formation; the presence of water increases this effect.

    Author Information:

    Ries, Herman E.
    Research Associate, Assistant Project Chemist, Division Director, Standard Oil Co. (Indiana), Whiting, Ind.

    Cook, Hurley D.

    Loane, Clarence M.

    Committee/Subcommittee: D02.C0

    DOI: 10.1520/STP48043S