Issue 54, 2017, Issue in Progress

A novel experimental device for electrochemical measurements in supercritical fluids up to 700 °C/1000 bar and its application in the corrosion study of superalloy Inconel 740H

Abstract

A three-electrode electrochemical study concerning electrically conductive materials submitted to supercritical fluids above 550 °C has not been reported in spite of its significance in many related fields. In this work, the design of a novel experimental device allowing three-electrode electrochemical measurements in high temperature and pressure fluids up to 700 °C/1000 bar is detailed described. In this device, pyrophyllite is used as a new electrode sealing material and the electrodes are sealed using a conical self-energizing sealing structure, which ensures the water tightness of the electrodes at pressures up to 1000 bar. The reference electrode in this device can either be an Ag/AgCl external pressure balanced reference electrode (EPBRE) or a platinum reference electrode. The potentiodynamic polarization plots and electrochemical impedance spectroscopy (EIS) of nickel-based superalloy Inconel 740H, a candidate material for Generation IV nuclear reactors, in deaerated water and chloride containing fluid (600–700 °C, 600–1000 bar) are presented using this device.

Graphical abstract: A novel experimental device for electrochemical measurements in supercritical fluids up to 700 °C/1000 bar and its application in the corrosion study of superalloy Inconel 740H

Article information

Article type
Paper
Submitted
10 Apr 2017
Accepted
29 Jun 2017
First published
05 Jul 2017
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2017,7, 33914-33920

A novel experimental device for electrochemical measurements in supercritical fluids up to 700 °C/1000 bar and its application in the corrosion study of superalloy Inconel 740H

S. Lin, H. Li, L. Xu, Y. Zhang and C. Cui, RSC Adv., 2017, 7, 33914 DOI: 10.1039/C7RA04054G

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