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- since 1996 -

Canadian Institute for NDE
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Technical Discussions
Mike
Mike
08:04 Mar-25-2009
Thickness of Al coating on Stainless Steel Pipe

Does anyone knw of a method or technique to determine the thickness of aluminum coating on Stainless Steel Pipe?

The Aluminum is supposed to be 2 microns thick but we want to try to prove it.

 
 Reply 
 
Joe Buckley
Joe Buckley
10:39 Mar-25-2009
Re: Thickness of Al coating on Stainless Steel Pipe
In Reply to Mike at 08:04 Mar-25-2009 (Opening).

Is the stainless steel magnetic?

If it is then a standard precision coating Thickness meter (such as our Sonacoat III) should handle it.

If not then it should still be possible with a standard eddy current flaw detector and suitable probe, although it will be necessary to draw up a custom calibration curve - You are using the fact that the Stainless steel is much less conductive than the aluminium.

 
 Reply 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
10:24 Mar-26-2009
Re: Thickness of Al coating on Stainless Steel Pipe
In Reply to Mike at 08:04 Mar-25-2009 (Opening).

Dear Mike,

The method given by Joe Buckley may work for thicker coatings but I am not sure that it works for the very thin coating that you are referring to. You may need to do some research and development work. Sample based destructive tests may be the only way if nothing else works.

Best wishes.

Swamy

 
 Reply 
 
duylgsbdill
duylgsbdill
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