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Aluminum components are getting puncture holes during anodising




Q. We have a dyed component for anodising; we tried with normal continuous current but the surface got "punctured", but we did it with pulse and we got the result. But the process is still not established. Can anyone suggest a tried process which works 100% for dyed components, as the client wants the component to be dyed in black .

Nagendra Surya
small scale jobworks - Bangalore, India
April 17, 2009



"The Surface
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A. Hi, Nagendra. May we take it that your shop is experienced in electroplating but is new to anodizing? Anodizing is an electrically insulating coating. So when you begin the process you must start at very low voltage (or at a controlled current) or you will burn and puncture the aluminum. As the thickness builds and the electrical resistance rises, you must raise the voltage (or maintain the current) because it starts gradually becoming a better and better insulator.

So, in addition to obtaining some books about anodizing to get a deeper understanding, you will need to buy rectifiers that offer ramp control for anodizing. Good luck. And you need good contacts on your racks because if a contact is poor and broken when the voltage is low, and then conducts when the voltage goes high, you will burn the parts. Best of luck.

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha

finishing.com - Pine Beach, New Jersey

Ted is available for instant help
or longer-term assistance.

April 17, 2009


A. Ramp control is a lot more foolproof than an employee and will save a lot of problems in the long run. Some companies can retrofit some of the power supplies.

Pits can occur in the rinse tank and the dye tank in some cases. You need a book to cover the why's and the preventions as it is more than a 1 paragraph answer.
So, you need to know when the pit is occurring.

James Watts
- Navarre, Florida
April 21, 2009




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