The quality study of composite galvanic coatings, obtained using electroerosive powders

Abstract

Actual is the task of creating the so-called composite galvanic coatings (CGC), introducing hardening additives in the form of finely dispersed powder into the solution. During the experiments, a coating was applied using a standard composition, and then a coating with the addition of EED powder in an amount of 5 g/l of solution. The microstructure of the obtained coatings was investigated using a Quanta 200 3D scanning electron microscope. Testing the hardness of the samples along the transverse section was carried out using the DM – 8 automatic microhardness analysis system. It was experimentally established that the composite galvanic coating has a clear boundary with the substrate and a transition friable layer of up to 30 μm. In this case, the presence of vertical cracks up to 50 μm in size was noted. It was shown that a composite coating obtained with the addition of an electroerosive powder in an amount of 5 g/l of solution has a microhardness 12% higher than a coating using a standard electrolyte composition.