Preparation And Hydrolysis Mechanism Of Aluminum-gallium Alloy

In the present study, we prepare Aluminum-Gallium (Al-Ga) alloys with intergranulardistribution of metal Ga by utlizing the principle of liquid metal Ga could spontaneouspenetrated into grain boundaries (GB) of the Al, and study the factors in the infiltration bycontroling the microstructural of the base material with rolling processing treatment,annealing treatment and solution heat treatment. In addition, the hydrogen productionmechanism has been discussed.It is found that both high angle grain boundaries (HAGB) and low angle grainboundaries (LAGB) can be penetrated by liquid Ga. Moreover, HAGB prefer to bepenetrated because of their higher GB energy. The cold-rolled treatment can introduceLAGB as the passes for the penetration of liquid Ga. Temperature elevation and thepresence of residual tensile stress on Al body can accelerate the infiltration rate of theliquid metal Ga during infiltration process. Moreover, the presence of the second phase isalso conducive to the infiltration of the metal Ga.Annealing treatment could change the existing state of metal Ga in the GB of Al,while the segregation and solid solution state can activate the Al body. Solid solution stateof metallic Ga was able to continue the desired hydrolysis reaction by providing asufficient amount of Ga ions. Meanwhile, when the ratio of the Ga solid solution state isless to the demand, it will required the segregation state of the metal Ga to start thehydrolysis reaction by offering a polarization environment for the Al matrix. DSC testsconfirmed that Al-Ga alloys after annealing could meet the requirements of the hydrolysisconditions with state segregation and solid solution of metal Ga both exist.。Air-coolling after annealing of Al-Ga alloys can inhibit grain growth effectively,reduce the production of grain boundary cracks and increase hydrogen production rate.The maximum hydrogen production of the Al-Ga alloys with air-cooled increased from63.7ml to96.4ml compared with the furnace-cooled, in another words, hydrogen storagecapacity could get16%by converting. Hydrolyzate of Al-Ga alloys tended amorphousnature structure, the smallest grain size can achieve the nanometer level and stacked into amassive reunion. The equation of the hydrolysis reaction of Al-Ga alloys will be deduced by determining the reaction product was boehmite.