How to know when a product has a clear anodized finish

  • Thread starter dmcgriff8 - 2006
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dmcgriff8 - 2006

#1
Can anyone tell me how to know when a product has a clear anodized finished.
 
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Jim Wynne

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#2
dmcgriff8 said:
Can anyone tell me how to know when a product has a clear anodized finished.
One way to tell is to use an ohmmeter and check for electrical continuity on the surface of the part; an anodized surface will show no conductivity.
 

Jim Wynne

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#4
dmcgriff8 said:
Is there a specific type of ohmmeter to use. A model or brand?
No. If you're working in a manufacturing facility, check with your maintenance people-someone has one. Any meter used for checking electrical continuity will work. Note that an aluminum part with a very thin coating of oxidation (that's what anodizing does--it oxidizes the surface) might show continuity, so the test is not conclusive. The anodizing specification should give the expected thickness, and in almost all instances where anodizing has effectively coated the part, there should be no continuity. Note also that clear coatings such as paints and sealers would have the same effect with regard to electrical continuity, so the test is not necessarily indicative of the part having been anodized. If there is electrical continuity across the surface of the part, you can be pretty sure that it has not been anodized.
 
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