关键词: 二氧化碳腐蚀, 影响因素, 缓蚀剂, 咪唑啉, 协同增效

Abstract:

The CO₂ corrosion mechanism was summarized and the influences of temperature, CO₂ partial pressure, pH and medium composition on CO₂ corrosion were analyzed. The corrosion inhibitors widely used to inhibit CO₂ corrosion such as imidazoline derivatives, surfactants, quaternary ammonium salts and organic amines were reviewed. The application and mechanism of several common corrosion inhibitors in CO₂ corrosion were described in detail. Most of the corrosion inhibitors acted on the active sites by physical adsorption and chemical adsorption, and the limitations of some corrosion inhibitors were pointed out. Usually the combined effect of two or more corrosion inhibitors was better than a single corrosion inhibitor, however, the role of a single component was difficult to measure. Imidazoline corrosion inhibitor was often used as one of the components of compound corrosion inhibitors in CO₂ corrosive environment, and the synergistic effect of imidazoline and other corrosion inhibitors was analyzed. Finally, the future research directions of CO₂ corrosion and CO₂ corrosion inhibitors were prospected.

Key words: carbon dioxide corrosion, influencing factors, corrosion inhibitor, imidazoline, synergistic effect