Quasi Non-Destructive Quality Assessment of Thermally Sprayed AISI 316L Coatings Using Polarization Measurements in 3.5% NaCl Gel Electrolyte

There is currently a lack of suitable methods non-destructive quality assessment thermally sprayed coatings. Therefore, this study investigates the suitability polarization measurements that are adapted to special needs coatings for testing. For purpose, gel electrolyte containing 3.5% NaCl and measuring cell based on three-electrode arrangement were developed prevent corrosion medium from infiltrating typical microstructure (pores microcracks). The newly method was evaluated AISI 316L deposited by high velocity air fuel (HVAF) atmospheric plasma spraying (APS). curves showed significant differences as result process-related changes in coating microstructure. Even slight oxide content within produced APS can be detected new method. In order verify findings, analyzed regarding their optical microscope, scanning electron microscope energy dispersive X-ray spectroscopy. offer promising opportunity evaluate largely manner using curves.