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Old 17th November 2008, 11:32 PM   #1
N1ESE is offline N1ESE  United States
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Default Anodizing Question

Does anyone know if the anodizing process reduces the conductivity of aluminum? I'm wondering if an aluminum chassis would still make for a good ground point if it is anodized.

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- JT
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Old 17th November 2008, 11:48 PM   #2
Aengus is offline Aengus  Canada
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Anodised portion is an insulator. If you want to use an anodised chassis as ground, you have to scrape away the anodisation at the connection point. Typically, one uses a bolt with a star (lock) washer to dig into the chassis as well.

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Aengus
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Old 17th November 2008, 11:49 PM   #3
N1ESE is offline N1ESE  United States
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Quote:
Originally posted by Aengus
Anodised portion is an insulator.
That's what I thought and wanted to confirm. Thanks mate.

- JT
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Old 18th November 2008, 12:28 AM   #4
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Default oxidisation

IIUC exposed aluminum will oxidise and eventually render itself partially or completely non-conductive. The anodisation process simply makes the layer of non-conductive material much thicker and pretty.

Thus I think the step of using the star washers is actually needed even on what look like 'shiny' surfaces, if a good connection is to be maintained.

Stuart
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Old 18th November 2008, 12:33 AM   #5
N1ESE is offline N1ESE  United States
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Default Re: oxidisation

Quote:
Originally posted by Stuart Easson
Thus I think the step of using the star washers is actually needed even on what look like 'shiny' surfaces, if a good connection is to be maintained.
Yup, star washers are a given on all ground source materials. I just needed clarification on how much of an insulator the anodizing process creates.
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Old 18th November 2008, 12:58 AM   #6
sam9 is offline sam9  United States
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Allodyne (sp?) is conductive and often used instead of annodizing just for that reason.
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