Kinetic Mechanism of Hydrogen Absorption of AA6111 Alloys Melt

Abstract

The kinetic mechanism of hydrogen absorption of the AA6111 alloy melt in different melting environments, and the in-situ real-time observation of the oxide film structure during the hydrogen absorption process were studied. The results show that the hydrogen absorption process of the aluminum alloy melt is related to the melting environment and the oxide film on the melt surface. The hydrogen content in the melt increases with the extension of time when the melting environment humidity and temperature are constant. The initial hydrogen content is also higher and the hydrogen absorption capacity of the melt is larger when the melting temperature is constant with an increasing melting environment humidity. The oxide film will fold over on itself and become porous, due to the change in the structure of the melt surface during heating. The surface of the melt is similar to the double-oxide-film defect hydrogen absorption carrier, which leads to the aggravation of hydrogen absorption. Hydrogen absorption kinetic equations for the aluminum alloy melt under different melting environments are obtained based on the experimental results.

Keywords

• AA6111 alloys
• hydrogen absorption
• kinetics mechanism
• melting environment
• oxide film