Abstract:The kinetics process of absorbing hydrogen of Al melt was analyzed and it was considered that the concentration of hydrogen in Al melt was determined by the concentration of water vapor in the interface of the oxide layer and Al melt. The change of the alloying composition will result in the change of compactability of oxide layer and affect the process of the water vapor gas penetrating the oxide layer and entering the interface of Al melt and oxide layer. Based on the above analysis, the kinetics equation of Al melt absorbing hydrogen was established, and compared with the test result. The results of calculation were elementally coincident with the test result. The curve of hydrogen concentration varying with reaction time in Al melt can be obtained from this equation. And scientific basis could be provided to select melting technology parameter properly and control the concentration of hydrogen in Al melt.

Key words: Al melt; absorbing hydrogen; kinetics