Surfactants are well known as an active ingredient of corrosion inhibitors; however, the molecular structure and its content of commercial inhibitors are not disclosed to users. The performance of commercial inhibitors was studied by treating the whole aspect of inhibitor as a kind of surfactant. The corrosion rate was measured with an autoclave by using an electrochemical measurement; namely, linear polarization resistance (LPR) in an oil flowline condition solution. Firstly, the corrosion rate was measured only with a corrosion inhibitor, and a hydrocarbon solvent was added afterwards. The decrease of the corrosion rate was observed after an addition of the solvent. Aliphatic, alicyclic and aromatic solvents with different octanol-water partition coefficients, KOW, were tested in the same manner. The inhibitor efficiency was saturated remarkably after the addition of a solvent with high KOW. The synergistic effect with a specific solvent in this test can characterize the hydrophobicity and the adsorption tendency of the commercial inhibitor without close chemical analysis to specify the surfactant in it.

Subject
Inhibitor performance, Corrosion rate, Autoclaves, Adsorption, Surfactants, Solvents, Dosages, Corrosion modeling, Reagents, Corrosion inhibitors, Linear polarization resistance, Hydrocarbons, Oil
Keywords:
Corrosion Inhibitor, CO2 Corrosion, Hydrophobic Interaction, Surfactant
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2022
Association for Materials Protection and Performance (AMPP)
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