Abstract
Fluorescence and IR absorption spectra are taken of coatings obtained by applying polyamide 6 powder on a steel substrate heated above the polymer melting point and subsequently cooling to room temperature. It follows from the coating spectra that the energy of a π* → n transition in the C—O bonds of polyamide decreases. Simultaneously, the maximum of a band assigned to the deformation vibrations of N—H bonds shifts toward longer wavelengths. These effects are explained by the formation of coordination bonds between Fe2+ ions having diffused from the steel into the polymer and nitrogen atoms entering into polyamide 6 molecules. As a result, a coordination-compound-saturated diffusion layer up to 100 µm thick arises near the steel surface. Coordination compounds squeeze the framework of the polyamide 6 molecule roughly by 0.06%. Eventually, a polyamide layer that is stronger than the surroundings appears at the polyamide 6—steel interface.
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Original Russian Text © V.I. Vettegren’, A.Ya. Bashkarev, A.V. Savitskii, I.P. Shcherbakov, V.V. Sytov, R.I. Mamalimov, 2015, published in Zhurnal Tekhnicheskoi Fiziki, 2015, Vol. 85, No. 8, pp. 155–158.
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Vettegren’, V.I., Bashkarev, A.Y., Savitskii, A.V. et al. Adhesive bonding between polyamide and steel. Tech. Phys. 60, 1257–1260 (2015). https://doi.org/10.1134/S1063784215080289
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DOI: https://doi.org/10.1134/S1063784215080289