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

作者：Lin, Sen; Li, Heping^*; Xu, Liping; Zhang, Yanqing; Cui, Can

来源：RSC Advances, 2017, 7(54): 33914-33920.

DOI：10.1039/c7ra04054g

• TEMPERATURE AQUEOUS SYSTEMS
• FIRED POWER-PLANTS
• REFERENCE ELECTRODES
• PRESSURE OXIDATION
• WATER OXIDATION
• REACTOR
• NANOPARTICLES
• KINETICS
• BEHAVIOR
• ALLOYS

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.

• 出版日期2017
• 单位中国科学院大连化学物理研究所