Assessment of Corrosion Product Formation (Iron Oxides and Oxyhydroxides) on Carbon Steel in Saline Media Containing Protic Ionic Liquids by Advanced Structural and Microstructural Characterization

This research examines the corrosion inhibitory effects of protic ionic liquids (PILs) on carbon steel in the presence of a saline solution. The study focus is on the role that PILs play in the formation and stabilization of a corrosion product. The study is undertaken from a mechanistic perspective beyond chemical composition analysis and the corrosion inhibition efficiency of corrosion layers formed during long-term corrosion exposure. The study employs a number of advanced methods of structural and microstructural characterization, including X-ray diffraction, Mossbauer and Raman spectroscopies, and various forms of optical and electron microscopy (ED, FIB-SEM). The study also uses X-ray spectrometry with energy dispersion to undertake elemental analysis of

the oxides and oxyhydroxides of iron, oxygen, nitrogen, chlorine, sodium, and in some cases other elements. The study aims to provide insight into the formation of certain iron oxides and oxyhydroxides, including lepidocrocite, magnetite, and goethite, and to analyze for the first time the corrosion of PILs with carbon steel during the formation of individual oxide phases. The latter focus is a novel interpretation of the social interaction of corrosion inhibitors.

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