Experiments and Molecular Simulations to Study the Role of Coadsorption of Oil in Corrosion Inhibitor Films in Improving Corrosion Mitigation

While both field experience and laboratory experiments have shown that the efficiency of adsorbed corrosion inhibitor films improves upon exposure of the aqueous solution to a hydrocarbon phase, a credible explanation of these results is lacking. Using a combination of experiments and molecular simu...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2020-11, Vol.76 (11)
Main Authors: Ko, Xueying, Olivo, Juan Dominguez, Brown, Bruce, Nešić, Srdjan, Sharma, Sumit
Format: Article
Language:English
Subjects:
Adsorption
Aqueous solutions
Contact angle
Corrosion
Corrosion inhibitors
Corrosion mechanisms
Cylinder heads
Cylinders
Equilibrium
Exposure
Hydrophobicity
Inhibitors
Mathematical functions
Mechanics
Metal surfaces
Metals
Mitigation
Morphology
Oil
Phase transitions
Phosphate esters
Pipelines
Self-assembled monolayers
Self-assembly
Simulation
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Summary:While both field experience and laboratory experiments have shown that the efficiency of adsorbed corrosion inhibitor films improves upon exposure of the aqueous solution to a hydrocarbon phase, a credible explanation of these results is lacking. Using a combination of experiments and molecular simulations, this study examines how exposure to oil molecules affects the nature of adsorbed corrosion inhibitor films on metal surfaces. It is found that oil molecules get coadsorbed in the corrosion inhibitor films, making them more hydrophobic, structurally more ordered, and well packed. Corrosion inhibitor molecules with a bulky polar head adsorb in nonplanar, cylinder-like morphologies. Coadsorption of oil molecules changes the morphology of these films to a planar self-assembled monolayer.
ISSN:0010-9312
1938-159X
DOI:10.5006/3606