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Date of Publication:2022-10-06

Journal:材料导报

Volume:21

Issue:11专辑

Page Number:263-266

ISSN No.:1005-023X

Abstract:Oxidation film of aluminum is prepared in electrolytes with Na_2SiO_3 by
   micro-arc oxidation meth od. The effect of current density,duty ratio
   and frequency on structure and properties of microarc oxidation coating
   on aluminum is studied by XRD, SEM, micro-hardness test, thickness test
   and dropping corrosion experiment. The results show that the coatingrs
   hardness, surface roughness and the content of alpha-Al_2O_3 and
   gamma-Al_2O_3 increase with the increase of current density. The
   thickness and corrosion-resistance increase first and then decrease with
   the increase of current density. With the increase of duty ratio, the
   ceramic coatingrs thickness, hardness and surface roughness increase.
   When the duty ratio is less than 30%, the corrosion time increase with
   the increase of the duty ratio. But when the duty ratio is more than
   30%, the corrosion time is decrease. When the duty ratio is 30%, the
   ceramic coating has best corrosion resistance. The influence of
   frequency on the coating′s hardness and roughness is little. When the
   frequency is 5000Hz, the coating has best thickness and corrosion
   resistance.

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