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Infrared spectra of surface films formed on iron and steel mirrors by propargyl alcohol, acetylene, and ethynyl-cyclohexanol acid corrosion inhibitors were recorded using a multiple reflectance technique. These spectra showed that the acetylenic molecules reacted at the metal surfaces in HC1 solutions to produce protective polymer film coatings. Corrosion protection increased markedly as the polymer coatings grew from nearly two-dimensional, adsorbed layers to films 20~ ~ thick. Saturated hydrocarbon material composed the majority of these films. Hydrogen evolved by the acid corrosion reaction probably participated in hydrogenating adsorbed acetylenic species. The polymer also contained several polar species including hydroxyl and carbonyl groups. Increased carbonyl content appeared to decrease the protectiveness of these films.

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Infrared multiple reflectance spectra were used to record the growth of oxide films on copper and iron mirrors. Cuprous oxide and cupric oxide films were readily distinguished since they exhibit intense single bands at 640 cm -1 and ~560 cm -1, respectively. Iron oxide films of a single composition also exhibit highly characteristic bands in the 230 to 1100 cm -i region of the reflectance spectra. Spectra of mixed iron oxide films were composed of many highly overlapping bands making quantitative interpretations difficult. The intensities of the infrared bands from the copper oxide and iron oxide films were directly proportional to the oxide film thicknesses. Using a seven reflection-73 ~ incidence optical accessory, sensitivity to detect oxide films as thin as about 5A was achieved.