PERSISTENCY OF CORROSION-INHIBITOR FILMS ON C-STEEL UNDER MULTIPHASE FLOW CONDITIONS - PART-II - OPTICAL SHG AND ELECTROCHEMICAL STUDIES

A study on the persistency of inhibitor films under multiphase flow co nditions using a jet-cylinder electrochemical cell is presented. Optic al Second Harmonic Generation (SHG), electrochemical noise and linear polarization resistance were used to monitor the surface coverage of t hree CO2 corrosion inhibitors. It was found that slug flow conditions, generated by simultaneously applying a liquid jet and ultrasonic cavi tation. can cause breakdown of the inhibitor film below inhibitor conc entrations of several ppm. Removal of the inhibitor film was not found under jet-only or sonication-only conditions. Furthermore a jet of si lica particles was also found to cause some stripping of the inhibitor film. (C) 1998 Elsevier Science Ltd. All rights reserved.