Study of the Synergistic Effect Between Corrosion Inhibitors by Using Fractional Free Volume
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The fractional free volumes(FFVs) of the adsorption films formed with different ratios of dipropargyl methoxythiourea imidazoline(DPFTAI) and pyridine quaternary ammonium salt(16BD) were calculated by simulation to determine their synergistic corrosion inhibition effect. The results suggest that the composite corrosion inhibitor at the molar ratio between DPFTAI and 16BD of 4:1 gives the best corrosion inhibition effect. This simulation method to predict the synergistic effect between corrosion inhibitors was further validated by mass loss and electrochemical experiments. This finding delivers valuable understandings of inhibition mechanism of corrosion inhibitors.
KeywordsCO2/H2S corrosion Imidazoline Corrosion inhibitor Synergistic effect Fractional free volume
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