Effect of Heat Treatment on Corrosion Activity of Nonmetallic Inclusions and Steel Corrosion Resistance in Aqueous Media
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Results of the studying the effect of heat treatment on the corrosion activity of non-metallic inclusions in contemporary steels, and correspondingly on corrosion resistance of the steels themselves, as applied to the conditions of oil-field pipeline operation, are presented. It is shown that after heat treatment (quenching and tempering) steel contamination with nonmetallic inclusions detected by Oberhoffer reagent and affecting steel corrosion resistance decreases (some nonmetallic inclusions lose their corrosive activity), which ensures an increase in corrosion resistance of steel (obtaining lower values saturation current density when tested by an electrochemical method for assessing corrosion resistance).
Keywordssteel corrosion resistance neutral aqueous media oil industry pipelines complex nonmetallic inclusions non-metallic inclusion corrosion activity heat treatment electrochemical method for evaluating corrosion resistance
Research was conducted within the scope of a comprehensive project for creating high-tech production on the theme “Development and assimilation of high-tech production of cold-resistant and corrosion resistant rolled product for preparing straight-seam gas and oil pipes within the scope of the infrastructure development of TÉK RF with the aim of import substitution” (RF Government resolution No. 218 of 04.09.10, agreement No. 02.G25.31.0141).
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