Purpose The purpose of this study is to address the severe corrosion of L245 carbon steel in CO2-O2 coexistence environments within oil and gas fields. Therefore, a strategy involving the formation of a dual-layer film (oxide film + inhibitor film) on the L245 carbon steel surface is proposed. Design/methodology/approach A double-layer film with an outer hydrogen barrier layer and an inner oxygen-resistant layer oxide film/3-mercapto-1,2,4-triazole (MTZ) corrosion inhibitor was designed. The weight loss method, electrochemical tests, surface morphology analysis and molecular dynamics simulation were adopted to evaluate its performance in a 2 Wt.% sodium chloride solution, and the underlying mechanism was investigated. Findings The double-layer film showed excellent protective performance in CO2–O2 coexisting environment. Molecular dynamics simulation verified that MTZ inhibitor had stronger adsorption affinity on iron oxide than on iron. Originality/value The double-layer film composed of the inner oxide film and the outer MTZ corrosion inhibitor film can achieve the dual effects of blocking H + and resisting O2.
Liu et al. (Sat,) studied this question.
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