Effect of Air-Gap Thickness on Debond Detection in Coatings using Pulsed Thermography: A Numerical Study

In industries coatings have become important part of system which protect the structural materials from hazardous and corrosive environment by improving its surface properties. Coatings need to be characterised for thickness, adhesion strength and debonds, before it can be used in the field. Debond is the most common type of defect which occurs in coatings, which is the lack of chemical bonding between coating and substrate leading to separation of coating from the substrate.