Letter 23084

Hard Anodising on Al 6061  

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What is the range of Hardness a Hard anodised aluminum can offer? In what tolerance the dimensions after hard anodising can be controlled? If we require a tolerance of +/-0.002 mm, will it require post grinding operation? What are the production freindly techniques to mask portion of substrate during hard anodising?

Regards,

Nagesh Desai
- Mumbai, Maharashtra, India

Hi, Nagesh, welcome to finishing.com. Could you rephrase your question along these lines: "We make xxxxxx here, and we have discovered a problem with xxxxxx when to try to xxxxxx. We tried to solve it by xxxxx but it didn't work because xxxxxxx, and we think hard anodizing may be a good fabrication method because xxxxxx -- but we are worried about xxxxx"? Then I am confident that your questions would be answered.

I suggest this because many times a relatively easy question goes unanswered here, and I don't think it's because no one knows the answer but because they just don't feel like spending their time helping a stranger when the other person has not taken the time to offer even a crumb of their own knowledge in return :-)

Ted Mooney, P.E.  finishing.com Brick, New Jersey

Hard anodising can be controlled to the accuracy of about 10 microns.Usually this is done with a sample panel working along with the components and checking the thickness time to time

One of the easiest is to chromic anodise the portion which require masking for hard anodising. This need some experience.

Proprietory stop off lacquor can also be used as masking for hard anodising.

Dr. H B Rudresh
- Bangalore, India

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