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Disclosed is an electrode design for uniformly anodizing or electroplating the surfaces of deep, narrow channels.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
89% of the total text.
Page 1 of 1
Oscillating Electrodes for Anodizing/Electroplating Deep Channel Surfaces
Disclosed is an electrode design for uniformly anodizing or electroplating the
surfaces of deep, narrow channels.
Uniform anodizing or electroplating inside deep, narrow channels is difficult
due to the fact that ionic current in the electrolyte used for anodizing or
electroplating takes the path of least resistance. The result is that the anodized
layer or electroplating is thinnest at the channel bottom, with the thickness
increasing towards the channel opening. Another difficulty with deep channels is
poor electrolyte concentration control inside channels due to the lack of stirring
action inside the channels.
Uniform anodized layer (or electroplate) is obtained if the ionic charge
delivery and the electrolyte concentration across the surface being anodized (or
electroplated) are uniform. These two conditions are ensured by the oscillating
electrode design described in the figure.
The ionic current is restricted to a small area 10 in the channel by means of
an electrode 11 consisting of a narrow insulating box 12 open on the bottom and
closed at the top by a metal piece 14 such as lead. The small area at the
opening at the bottom of the box to which the ionic current is restricted is
oscillated between the channel bottom and top to ensure uniform ionic charge
delivery. Electrolyte concentration is kept constant at the opening at the bottom
of the box by pumping the electrolyte down betwe...