Is there a method to test for thermal oxide on a painted steel part after the paint has cured? I'd rather the method be nondestructive but it only being destructive in the presence of thermal oxide is also acceptable.
I am specifically looking for laser oxide under 3mils of polyurethane, if that helps.
This article written on May 02 2012 states that no non-destructive methods exist currently, other than a scanning Kelvin probe (which requires long measurement times).
However, it states that research is in progress into using Pulsed Phase Thermography. According to the article it's got teething problems but has proved that it's possible.
