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Summary
An evaluation was performed of the anodizing of wrought and cast aluminium alloys in a sulphuric acid solution with the addition of a proprietary addition agent containing ferric sulphate.
The process enabled the anodizing time to be reduced to approximately 50% of the time taken in standard DC anodizing. The surface area which could be anodized in a given volume of solution was also greater than is normally found due to the use of two work bars operating positively and negatively in an alternating manner.
The quality of the coatings produced was suitable for the application. In the case of diecastings thicker coatings were obtained with AC than with DC. A more consistent colour was obtained after dyeing. Castings with AC anodize followed by a sodium dichromate seal performed well on outdoor exposure tests.
The process was shown to be operable over a wide range of conditions.
Additional information
Notes on contributors
S. A. Harris
Mr S.A. Harris is Principal Engineer in the Technology and Engineering Department of ITT Cannon UK. He is involved in surface technology and materials development aspects of the electrical connector industry. He is a past Chairman of the IMF Southern Branch and is currently a member of the IMF Council.