首页|Hydrolysis of imidazoline based corrosion inhibitor and effects on inhibition performance of X65 steel in CO2 saturated brine
Hydrolysis of imidazoline based corrosion inhibitor and effects on inhibition performance of X65 steel in CO2 saturated brine
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The molecular characteristics of a TOFA/DETA based imidazoline inhibitor were evaluated by analysing the inhibitor protonation profile, the CMC and micelle size and the rate of acid-catalysed hydrolysis of the inhibitor to improve understanding of the corrosion inhibition performance of the main imidazoline component and its hydrolysis products. The ability of the TOFA/DETA imidazoline based corrosion inhibitor and its products of hydrolysis in retarding both uniform and localized corrosion were assessed and compared on wet-ground X65 carbon steel at 80 °C in CO2 saturated 3 wt % NaCl brines. The findings indicate that the imidazoline based inhibitor forms micellar solutions, with a characteristic micelle size of 18 + 9 nm at the CMC (10 ± 1 ppm) in CO2 saturated 3 wt % NaCl brines, and that under such conditions (pH~4.1), the inhibitor is fully protonated which increases inhibitor solubility/dispersibility and enhances molecular adsorption of the positively charged imidazoline on the metal surface thereby improving inhibition performance. Hydrolysis of the imidazoline and amido-amine is acid-catalysed and the consumption of imidazoline follows a pseudo-first-order reaction mechanism with an activation energy of 72.0 + 2.9 kj mol~(-1). The study concludes that the pre-aged inhibitor has different effects on uniform and localized corrosion behavior of X65 carbon steel.
CO2 corrosion Imidazoline inhibitorHydrolysisLocalized corrosion
Evgeny Barmatov、Trevor L Hughes、Amir Shamsa
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Schlumberger Cambridge Research, Cambridge, CB3 OEL, UK
Institute of Functional Surface, School of Mechanical Engineering, University of Leeds, Leeds, LS2 9JT, UK
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