Peculiarities of Corrosion of a Zinc Coating in Neutral Media in the Presence of Inhibitors Based on Benzotriazole, Cyclohexylamine, and Morpholineстатья

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Дата последнего поиска статьи во внешних источниках: 8 декабря 2019 г.

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[1] Peculiarities of corrosion of a zinc coating in neutral media in the presence of inhibitors based on benzotriazole, cyclohexylamine, and morpholine / O. M. Kanunnikova, V. V. Aksenova, B. E. Pushkareva, V. I. Ladyanov // RUSSIAN JOURNAL OF NON-FERROUS METALS. — 2019. — Vol. 60, no. 4. — P. 390–400. The inf luence of domestic nitrogen-containing corrosion inhibitors of the VNKh-L type on cor-rosion regularities of a zinc coating on steel in neutral media is investigated. This work is aimed at studyingthe surface structure of a corroding zinc coating, as well as the inf luence of conditions simulating the degra-dation of inhibitors during real operation on their protective properties. Mechanical activation in a ball plan-etary mill is used to simulate the deformation and thermal operational conditions of inhibitors. Corrosion ofa zinc coating on steel is carried out in a sulfate–chloride medium simulating atmospheric corrosion and ina borate buffer solution. The concentration of inhibitors in the corrosion media was 0.2 wt %. The morphol-ogy of a corroded surface of a zinc coating is studied using a Philips SEM-515 scanning electron microscope(at an accelerating voltage of 10 kV) with an X-ray microprobe. Studies of the corrosion rate of zinc coatingon St 08 are carried out by the indirect measurement of corrosion resistance with the help of a MONIKOR-1corrosion meter. A borate buffer solution (Na2B4O7 + H3BO3, pH = 6.6) and a solution simulating atmo-spheric corrosion (NaCl + Na2SO4, pH = 6.0) are used as corrosion media. The corrosion rate of samples incorrosive media without an inhibitor is accepted 1. The exposure time of each sample in corrosive media is3 h. The chemical composition of corrosion products is studied by the mirror ref lection in the IR range. TheIR spectra of the metal plate surface are recorded using an FSM-1202 IR Fourier spectrometer in a wave-length range of 450–4000 cm–1 with a resolution of 2 cm–1 and an accumulation of 100 scans. To record theref lection spectra, a mirror-ref lection attachment with a 10o angle of incidence is used. The corrosion rate ofzinc coating in sulfate–chloride and solvent media in the presence of inhibitors based on benzotriazole andcyclohexylamine is practically not decreased when compared with the corrosion rate in the same media with-out inhibitors. The addition of both initial and mechanically activated inhibitors based on morpholine andbenzotriazole to the corrosion medium decreases the corrosion rate of iron when compared with the corro-sion in the same media without inhibitors. The pitting corrosion of a zinc coating is observed in the presenceof initial and mechanically activated inhibitors of both types in studied corrosion media. Herewith, the pittingdepth is smaller than the zinc-coating thickness under these conditions. [ DOI ]

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