Posted by Srimay Basu (195.229.185.180) on October 15, 2007 at 22:47:03:
In Reply to: mm sized Gaps or holes in Anodized Surface posted by Jeremy Senn on October 15, 2007 at 14:40:32:
: I just recently began working for a company that is having issues with anodizing T6 6061, the problem that I have with the current process is that the parts are sent into the age oven after quenching with water still sitting in the parts from the quenching process. My question is how badly does oxide formation prior to anodizing effect the final product. My theory is that large amounts of oxides are being formed in some of the parts due to the supper heated H20 during aging. Then this causes galvanic corrotion problems during the etching process, leaving pits that are not properly anodizing.
Hi Jeremy,
This is one of the common problem when quench sensitive alloys are extruded. For these kind of alloys when anodising is required, usually we follow several ways, e.g.
1. Use DI water in cooling sprays at press.
2. Use a band of compressed air jets on the profiles immediate after the quench box to blow off the water globules from the profile surface.
3. If polishing facility is available in anodising plant then polish prior anodising. It may involve some extra cost but worth doing.
Good luck.
Basu