通过分析铝的多孔型膜在(NH_4)2MoS_4水溶液中恒电流密度下二次阳极氧化时对应的电压与时间关系曲线,提出如下机理:二次阳极氧化过程中,孔中溶液酸度的变化引起电场助溶作用下孔中溶液对阻挡层溶解能力的变化,因而在二次阳极氧化的不同阶段阻挡层的厚度不同。对应的电压与时间关系曲线则反映了阻挡层厚度的变化。建立了孔中OH~-和MoS_4~(2-)等离子的迂移模型。
A mechanism of reanodizing porous anodic films on aluminium in(NH_4)_2MoS_4 aqueous solution at various constant current densities is proposed by analysing the voltage time transients. It is suggessted that the acidity change of the solution in pores causes the change of aggressiveness of solution to the film. The change of aggressiveness, in conjuction with the action of electric field assisted dissolution, results in the thickness variation of barrier layer in different stages of reanodizing. The V-t transients reflect the change of the barrier layer thickness. A model of ion migration in pore channels is postulated.
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