Selective, High Speed, Laser-Enhanced Anodization and Cutting of Certain Metals to Form Shaped Articles or Aluminum Photo-Circuit Boards
Original Publication Date: 1985-Sep-01
Included in the Prior Art Database: 2005-Feb-19
Rapid enhanced electroetching of Al provides simultaneous anodization. Very high density Al circuits in multilayers with ground planes are formed through laser-enhanced anodization. When Al, or Ti or Nb, for example, is anodized in an aqueous solution such as oxalic acid or H2SO4, a uniform thickness layer of anodized Al is formed. The thickness of the anodic film depends not only on the current and time used but also on the temperature of the electrolyte. The higher the temperature, the higher the solubility of the anodic oxide and the thinner the anodized layer on the Al, Ti, etc. I have found the above to be true during my work with selective anodization of Al to form electrical circuits by anodization through masks.