Saturday, June 25, 2005

THE ANODIZATION OF THE ALUMINUM METAL

Before anodizing the aluminum metal, a 100 mL .3 M oxalic acid solution was prepared. Since I was using a .5 M bottle of oxalic acid, I used simple mathematics to calculate that 60 mL of the .5 M bottle and 40 mL of water will give me my desired solution. The solution was mixed vigorously and then poured into a 50 mL beaker. The beaker was placed on a magnetic stirring device, where it would remain for the whole anodization. The reason the solution would have the constant need of stirring is because the anodization process is a diffusion-limited process. Without proper stirring, the pores will not uniformly form across the metal.
Anyways, once the solution's temperature reached the desired temperature of 10 degrees Celsius, we were ready for the anodization. The aluminum metal-stainless steel "device" was immersed in the oxalic acid solution. At the same time, a magnetic stirrer was stirring the solution. It became very important to make sure the device and the stirrer did not interfere in each other's space. Once a good position for the device was established, a clamp was used to keep it in place. We then attached the appropriate wires to the copper on which the aluminum metal (anode) rested and the stainless steel plate (cathode). Once in solution, we raised the voltage to 80 volts. The anodization time was set for 12 hours.


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