Changes of physical and chemical and mechanical properties of powder coatings based on Ni before and after influence by the concentrated energy fluxes

Using the plasma-detonation technology, we deposited the coatings of Pi Gamma AH-34, Pi Gamma-10H-01, and Pi Gamma-19H-01 alloys on a substrate of low-carbon steel 3. A thickness of these coatings was from 110 to 180 mu m. After this, the specimens were irradiated using a high-velocity plasma jet or a high-current electron beam from a side of the coating until a full melting. X-ray analysis (XRD) using two apparatuses, a conversion electron Mossbauer spectroscopy (CEMS), a transmission microscopy, a scanning microscopy with and without a micro-analysis as well as tests for nano- and microhardness, friction wear in a technical vaseline, an adhesion power, and corrosion resistance in a seawater were applied for analysis. We revealed that, depending on an energy density of the high-current electron beam (HCEB) or the plasma jet, phases FeNi3, Fe0.64Ni0.36, Ni71.58Cr15.41Fe7.75 were formed in the coating near a surface layer. Also, we found that phases Ni16Cr6Si7 and Ni3B were formed in little amounts. CEMS data demonstrated both a partial amorphism of a compound with an iron and a possible formation of FeNi3. The microanalysis of the coating surface layer demonstrated a significant redistribution of the elements forming the coating and the substrate. After irradiation, a roughness of the specimens is decreased; in the surface, one could see many regions subjected to melting. Nanoindentation tests demonstrate an increase of a nanohardness from 3.7 +/- 0.5 to 6.8 GPa in one case and from 3.9 +/- 0.2 to 6.1 GPa in the other case. A powder adhesion is increased after treatment by concentrated flows of energy (CFE); a friction-wear resistance in technical vaseline is increased by two orders of a magnitude.