The influence of corrosion-active non-metallic inclusions on the corrosion resistance of coiled tubing steels

Keywords

steel, model stratal water, corrosion, corrosion-active non-metallic inclusions, microstructure, pitting.

Cite as

Nengjun Ben, Gural T. O., Vasyliv O. M., Vytyaz O. Yu., Nespliak Yu. M., and Kravchuk S. I. The influence of corrosion-active non-metallic inclusions on the corrosion resistance of coiled tubing steels. Physicochemical Mechanics of Materials. 2024. 60(1), 084-089.

https://doi.org/10.15407/pcmm2024.01.084

Abstract

The influence of corrosion-active nonmetallic inclusions (CANI) on corrosion resistance of coiled tubing steels was studied in a 3% NaCl aqueous solution and model stratal water (MSW), chemical composition of which corresponds to water of Yabluniv oil and gas condensate field and is saturated with carbon oxide. It is shown that the corrosion rate of HS-90 steel in MSW is approx. 2 times higher than of GT-90 steel and in 3 times higher in a NaCl solution. After exposure to this solution at 20°C for 72 h a uniform corrosion without pitting was observed on GT-90 steel surface, while on HS-90 steel the pitting corrosion was observed which developed on corrosion-active nonmetallic inclusions (CANI). Inclusions density is approx. 6 pcs/mm². Branched corrosion damages propagate deep into the metal from inclusions.

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