A three-electrode electrochemical study concerning electrically conductive materials submitted to supercritical fluids above 550 degrees 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 degrees 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 degrees C, 600-1000 bar) are presented using this device. Publication name | RSC ADVANCES, 7 (54):33914-33920; 10.1039/c7ra04054g 2017 | Author(s) | Lin, Sen; Li, Heping; Xu, Liping; Zhang, Yanqing; Cui, Can | Corresponding author(s) | LI Heping liheping@vip.gyig.ac.cn Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths In, Lincheng West Rd 99, Guiyang 550081, Peoples R China. | View here for the details
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