In order to inhibit the hydrogen evolution of powder mixture of Zn and Al in waterborne environment due to galvanic corrosion,in this paper,the flake Al powder was coated by SiO_2 to decrease the contact possibilty of Al particles with Zn particles,so that to suppress the galvanic corrosion between them.SEM and XPS were used to characterize the SiO_2 coated Al powder.The hydrogen evolution of the powder mixture of SiO_2 coated Al and Zn was investigated.The results showed that hydrogen evolution of the mixture of flake Zn and Al powder was efficiently inhibited by replacing Al by SiO_2 coated Al,the optimum n（H_2O）/n（SiO_2） was 10 for preparation of the SiO_2 coated Al.There existed chemical bond of Al-O-Si between Al surface and SiO_2 film.
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