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The paper presents an active thermography method that utilizes eddy current heating to evaluate the uniformity of the corrosion protection layer on a metal element. Eddy currents, also known as Foucault currents, have been known for several decades and serve as a method of non-destructive testing. The new method uses eddy current for thermal stimulation of the test material [1]. Pulsed Eddy Current Thermography is a technique that uses pulses of eddy currents induced in conducting media to generate local heating inside the material. The transient diffusion of the heat inside the material, induced by pulsed induction heating, is imaged by measuring the transient temperature profiles on the surface of the material [2]. The presence and characteristics of the defects inside the materials changes the surface temperature transients and thus can be used for the nondestructive evaluation (NDE) of conducting materials [3, 4]. Experimental tests demonstrated that this method is capable of detecting non-uniformity in very thin layers of corrosion protection of flat metal elements.

Evaluation of Paint Coating on Metal Elements Using Scanning Pulsed Eddy Current Thermography