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How to calculate proper painting thickness for corrosion protection



May 24, 2010

Hi,
I want to know how select the thickness of color on a surface when we want take care of corrosion?
Is there a formula to calculate it or a standard?
Thanks.

Kimia Alizade
Researcher - Kerman, Iran



June 1, 2010

That will be a function of the type of paint, the prepaint preparation, the abuse the part will take and the actual environment. Not many paint companies want to quantify this as there are too many variables.

James Watts
- Navarre, Florida



August 2, 2010

Dear Kimia Alizade

There are standards and tests proposed, depending upon the type of application and life time required.
For example ISO 12 944 (www.iso.org) .. look for "paint".
At the site of the ASTM you will find "some" too.
However, a specific application can lead to a total different result in practice. The proposed tests and standards are there to guarantee that you took all necessary precautions to have a coating that functions in a "normal/standard" environment. It's already better than no testing at all and "just do something" but having said this, it still gives you some idea, but if you have total different conditions, you still could face unpleasant surprises and unfortunately it finally comes down to the "real life test".

Best regards,

Harry van der Zanden
Harry van der Zanden
- Budapest, Hungary


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