Utilizing benzotriazole inhibitor for the protection of metals against diffusion-controlled corrosion under flow conditions

In this work, an annulus-type recirculated batch reactor is designed to study the influence of different process parameters on the corrosion rate of metals under diffusion-controlled conditions. The effect of solution flow rate (for both laminar and turbulent flow regimes), physical properties of the solution, annulus geometrical parameters, and the effect of adding benzotriazole inhibitor on the corrosion are investigated. The rate of corrosion was expressed in terms of the mass transfer coefficient in the form of an empirical dimensionless correlation. The maximum attained efficiency of inhibition is 98% in the case of laminar flow and 90% in the case of turbulent flow conditions. The importance of the present work with its practical application for the corrosion and protection of double pipe heat exchangers and condensers where the flow is developing was highlighted.