Detection of Adherence Imperfections at the Inteface of Substrate-coating Layer by Using Infrared Thermography

A. Murariu, S. Crâsteţi, National R&D Institute for Welding and Materials Testing ISIM Timisoara, Romania, I. Samardzic, Mechanical Engineering Faculty in Slavonski Brod, Josip Juraj Strossmayer University of Osijek, Slavonski Brod, Croatia The paper presents Infrared Thermography (IRT) for non-destructive examination of the imperfections in the coatings layers deposited by Electric Arc Spraying (EASP), designed to assess the dimension and position of the lack of adhesion, as a typical imperfection placed at the interface between the coating layer and the base material. Metallographic analyses were used to confirm the absence or presence of imperfections, enabling establishment of the etalon for non-destructive examination and detection of adherence imperfections at the coating–substrate interface layer, together with optimum process parameters, obtained by experiments.