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This paper is a continuation of a series of publications related to laboratory assessment of the performance of carbon dioxide corrosion inhibitors for oilfield pipelines in the West Siberian region. The test results obtained in U-shaped glass cells are considered. The effects of temperature, carbon dioxide content, test duration, specimen surface condition, presence and volume of a hydrocarbon phase, and inhibitor concentration on the corrosion kinetics and protective properties of a wide range of industrial inhibitors are analyzed. Recommendations are given on specific inhibitor test conditions to be used for assessment of inhibitor suitability for the protection of water pipelines and oil pipelines with low watercut.

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Initial stages of the formation of magnetite coating (MC) on low-carbon steel in ammonium nitrate solution at a temperature of 98 ° C is studied by atomic force microscopy. Analyzing the results obtained by flicker-noise spectroscopy allows the degree of continuity and structuring of MC to be estimated. It is shown that the formation of magnetite nuclei in the course of direct electrochemical reaction may take place in the first minutes of oxidation; continuous coating is formed in10-15 min.

Hydrophobization of a surface by fluorosilanes is proposed for protection of low carbon steel with conversion coatings from atmospheric corrosion. The effect of the heterogeneity of conversion coatings on their hydrophobicity is shown. Employment of superhydrophobization processing increases the angle of wet ting of the surface by a water droplet up to 160° and significantly enhances the anticorrosion properties of such a composite coating.

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