Quantification of Airspace Transport Kinetics of Volatile Corrosion Inhibitors Using Metal Oxide Gas Sensors

Résumé fourni par la source

Abstract Volatile corrosion inhibitors (VCIs) are widely used to mitigate corrosion in enclosed systems such as aboveground storage tank (AST) soil-side bottoms, pipe casing annuli, and complex piping networks by providing a protective airspace environment. Current industry evaluations, such as the VIA “jar test” (NACE TM0208), focus on end-state protectiveness; however, they offer limited understanding of the fundamental transport phenomena that govern VCI performance. This study proposes an integrated experimental and modeling framework aimed at quantifying the kinetics of VCI generation, propagation, and depletion. The approach utilizes metal oxide semiconductor (MOS) chemiresistive sensors, complemented by colorimetric detection, to monitor transient VCI concentrations in controlled bench-scale jar tests and simplified pipeline geometries. Experimental data were used to develop unsteady advection–diffusion–reaction models based on dimensionless numbers, yielding estimates for kinetic generation and effective diffusivity. Results showed good agreement between colorimetric analysis, sensor data, and model predictions.

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