Inconel 625とSUS 316Lの水素昇温脱離特性と電解チャージによる高圧水素ガス環境の模擬

Abstract

) and in gaseous hydrogen at the pressure of 0.3, 10, 20 and 45 MPa at 90° C. The states of hydrogen ex- isting trapping sites were compared using thermal desorption analysis(TDA). The diffusion activation energy is 46.5(kJ/mol) and the trap activation energy is 46.3(kJ/mol) for Inconel 625. These close values indicate that the hydrogen released from FCC metals is determined not by desorption from trapping sites but by diffusion in lattice. The hydrogen content of Inconel 625 in- creased upon the quenching and coldworking. This increase in hydrogen content corresponds to the increase in the densities of vacancies and dislocations. The hydrogen peak consists of solution hydrogen and trapped hydrogen at vacancies and dislocations. The peak temperatures in the hydrogen evolution curves of Inconel 625 and SUS 316L charged by electrolysis and highpressure gas at 90° C are the same after hydrogen saturation. In addition, hydrogen contents obtained upon charging by electrolysis exceed those obtained by highpressure gas of 45 MPa. This means that higherpressure gas environments of at least 45 MPa can be substituted by electrolysis charging. The hydrogensaturated contents of the metals increase with current density and catalyst content. Sievert's law describes the relationship among hydrogen content, hydrogen gas pressure, and temperature. Therefore, the gas pressures corresponding to electrolysis charging conditions can be obtained. When hydrogen is charged by electrolysis us- ing 0.1 mass NH4SCN at 50(A/m2), the hydrogen gas pressure of 1200 MPa is actualized by electrolysis charging.