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99217 DESIGNING AND BUILDING AN ELECTROCHEMICAL CELL TO MEASURE CORROSION RATE IN FLOW LINES.

Picture for 99217 DESIGNING AND BUILDING AN ELECTROCHEMICAL
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Product Number: 51300-99217-SG
ISBN: 99217 1999 CP
Author: Miguel Sanchez, Noris Hernandez and Graciela Gonzolez
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This paper describes the design, construction, and start up of an electrochemical cell to measure corrosion rate in flow lines. The cell central body was built from polytetrafluoroethylene (PTFE). The auxiliary, working, and reference electrodes were made of pure platinum, SAE 1020 carbon steel and Ag/AgCl, respectively. The design and the geometrical location of these electrodes are extremely important for the cell operation, in order to ensure that the hydrodynamic conditions should not be adversely affected. First, the assembled Ag/AgCl electrode reversibility and reproducibility were verified using a linear cathodic voltammetric technique, then, this electrode was set into the cell, and analyzed under static conditions using linear and potentiodynamic polarization in a lN H2SO4 solution, with and without inhibitors. The inhibitors used were propargilyc alcohol, benzotriazole, and 2-mercaptobenzothiazole. Therefore, the cell was line-assembled in a pilot plant used for assessing condensed systems through techniques of weight loss, linear polarization, iron content and electrical resistance. Results show that the corrosion values obtained from the cell corresponded to these determined by other techniques. Keywords: electrochemical cell, design, flow lines, corrosion, Ag/AgCl electrode, and linear polarization.
This paper describes the design, construction, and start up of an electrochemical cell to measure corrosion rate in flow lines. The cell central body was built from polytetrafluoroethylene (PTFE). The auxiliary, working, and reference electrodes were made of pure platinum, SAE 1020 carbon steel and Ag/AgCl, respectively. The design and the geometrical location of these electrodes are extremely important for the cell operation, in order to ensure that the hydrodynamic conditions should not be adversely affected. First, the assembled Ag/AgCl electrode reversibility and reproducibility were verified using a linear cathodic voltammetric technique, then, this electrode was set into the cell, and analyzed under static conditions using linear and potentiodynamic polarization in a lN H2SO4 solution, with and without inhibitors. The inhibitors used were propargilyc alcohol, benzotriazole, and 2-mercaptobenzothiazole. Therefore, the cell was line-assembled in a pilot plant used for assessing condensed systems through techniques of weight loss, linear polarization, iron content and electrical resistance. Results show that the corrosion values obtained from the cell corresponded to these determined by other techniques. Keywords: electrochemical cell, design, flow lines, corrosion, Ag/AgCl electrode, and linear polarization.
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