Integrated evaluation of mixed surfactant distribution in water-oil-steel pipe environments and associated corrosion inhibition efficiency

• Various phenomena affecting surfactant inhibition efficiency in water-oil-steel pipe were identified.
• The identified phenomena were categorized into three major domains and associated models.
• Sub-models were introduced for partitioning, micellization, and effective adsorption on metal.
• Integrated corrosion inhibition model was developed to evaluate inhibition efficiency.

One multiphysics model, integrated corrosion inhibition (ICI) model, has been theoretically introduced and experimentally validated for the integrated evaluation of water-oil partitioning, aggregation, adsorption/desorption, and corrosion inhibition of mixed surfactant inhibitors in salt-containing water-oil-steel pipe (WOS) environments. The ICI model is based on three major sub-models which consider water-oil surfactant partitioning, micellization, effective adsorption/desorption on substrate, surfactant type, surfactant-solvent interactions, surfactant-counterion pair, and lateral surfactant interactions etc., and intended to serve as a basic framework in the design, selection, optimization, and utilization of various pure and mixed surfactant inhibitors in WOS environments.

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