PERSISTENCY OF CORROSION-INHIBITOR FILMS ON C-STEEL UNDER MULTIPHASE FLOW CONDITIONS - PART-I - THE JET-CYLINDER ARRANGEMENT

A new jet-cylinder apparatus is described to study corrosion inhibitor film persistency under multiphase flow. A rotating cylinder electrode is used as the substrate and single phase flow conditions can be prod uced by firing a liquid jet at the cylinder. Multiphase flow condition s can be simulated by introducing ultrasonic cavities in the liquid je t. In addition, by introducing silica-particles in the jet, erosion-co rrosion can be studied. Wall shear stress values for a rotating cylind er electrode have been estimated by computational fluid dynamics and c ompared with limiting current densities under various flow conditions. From this it is concluded that mass-transport is not necessarily prop ortional to wall shear stress under single and multiphase conditions f or carbon steel in acidic (HCl) environment at higher flow velocities. (C) 1998 Elsevier Science Ltd. All rights reserved.