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| ACIDITY CHANGES AND FILM FORMATION ON ELECTRODE DURING THE NEGATIVE HALF CYCLES OF AC ETCHING OF ALUMINUM |
| Zhanwen Xiao; |
| 电子科技大学电子材料工程系 |
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Abstract An important factor in ac etching of aluminum foil in hydrochloric acid solution is a alkalization of the electrolyte near the cathode and precipitation of Al3+ as etch film depositing on aluminum,which influence in lare extent the morphology of etched surface.The mass transport process of hydrogen evolution on aluminum during the negative half-cycle of ac etching of aluminum in HCl solutions has been analyzed. An equation was derived to estimate the surface hydrogen ion concentration as a function of the bulk HCl concentration,curent density and frequency of the applied alternating current on the basis of diffusion equation in which diffusion and electrical migration of H+ in the electrolyte,as well as the variztions of actual hydrogen reduction current density with the surface morphology of aluminum were considered.The analysis showd that the formation of etch film occurs if the actual ratio of concentration of hydrochloric acid to the applied cathodic current density is lower than or equal to the corresponding critical ratio calculated by the inequality, where Co is the bulk HCl concentration in mol?L, i appl is the average value of current density in A/cm2, and f is the frequency of alternating current in Hz.The results published in literature can be interpreted satisfactorily by using the approximate formula.Thus, the etch conditions under which etch film is to be expected could be predicted on the basis of the present results.
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Received: 16 September 1998
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Corresponding Authors:
Zhanwen Xiao
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