Sunday, July 03, 2005

STEPS FOR LATERAL ANODIZATION

The steps for our experimental lateral anodization procedure involved basically the same standard steps for the regular anodization. Like the standard, electropolishing was done to level out the surface. And, like the standard, a setup for securing the metal in close range to the cathode was used. However, the variation from the standard was in that we needed to do everything from a lateral direction. So, we electropolished the metal's edge rather than its surface (To ensure that the surface would level properly, we mechanically polished the edges as well prior to electropolishing).
For the first anodization, we would keep the current density constant. Our setup included two panels and two gaskets (The extra gasket was used to ensure that water would not reach the "vertical" aluminum surface from either direction). Screw arrangements were designed so that they would not block the edge of the aluminum metal (the sample) from being exposed. The cathode would we a stainless steel wire wrapped around an arrangement of three screws. The wire would thus essentially provide uniform current to the sample.
For the second anodization, our test for the current density principle will be performed. This time around, we will simply use the wire to point at one end of the aluminum sample. The current would thus continuously decrease as the distance from a point on the sample to it increased. The results of this, we expect, will produce the desired drop in pore size and density across the sample.


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