surface polarization current density 表面极化电流密度
With the decrease of film thickness, the cathodic polarization current density of 7B04 Al-alloy increases, and the anode reaction is suppressed.
液膜厚度减小，7B04铝合金阴极极化电流密度增加，阳极反应受到抑制；
Along with the increase of the current density, cathode polarization effect, coating grain with increasing more and fine.
随着电流密度的增加﹐阴极极化作用随着增加﹐镀层晶粒越来越细。
When the current density is too low, the cathode polarization effect, smaller coating, not even orange crystal bulky coating.
当电流密度过低时﹐阴极极化作用较小﹐镀层桔晶粗大﹐甚至没有镀层。
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