|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Environmental Degradation of Multiple Principal Component Materials
||Equivalent Hydrogen Fugacity during Electrochemical Charging of Nickel Single Crystal: Comparison with Gaseous Hydrogen Charging
||Clara Juillet, Jiaqi Li, Caroline Traisnel, Marie Landeiro Dos Reis, Jamaa Bouhattate, Abdelali Oudriss, Laurent Briottet, Xavier Feaugas
|On-Site Speaker (Planned)
The hydrogen reactions of adsorption, absorption, diffusion and trapping into a metallic structure are susceptible to be enable during the application of a cathodic potential, which can lead to the materials embrittlement. These phenomena are complex and can be produced in metals by thermal or electrochemical charging. This study aimed at formalizing the link between the conditions of cathodic charging (overpotential, hydrogen flux, surface coverage) and the equivalent pressure of dihydrogen for nickel (100) single crystal by using a thermodynamic framework. The hydrogen reactions at the nickel surface in alkaline solution were dominated by the volmer-heyrovsky mechanisms at room temperature. The fugacity-real gas pressure equivalence had been established for a fugacity less than 400 atm, an overpotential between -1.2 V and -1 V and a hydrogen concentration less than 7 wt.ppm with a thermodynamic approach. The equivalence conversion model thus established will be challenged by gaseous hydrogen charging.
||Copper / Nickel / Cobalt, Environmental Effects, Other