Study of the Structure of Wear-Resistant Coatings Obtained under Different Technological Modes of the Arc Metallization

Arc metallization of the cored wires is one of the modern surface engineering technologies assuring high quality surface layers. The wire arc spraying process is widely used for protection of metal against corrosion and for restoration of worn parts of machines and mechanisms. The present study used a cored wire development IPNPN with additives of corundum. Wear resistant coatings of about 300 μm thickness were prepared through arc metallization of the flux-cored wires onto steel substrate. Technological modes of arc metallization such as current strength and arc voltage have a significant influence on the formation of coatings. The structure of coatings obtained at the current strength of 220-250, 250-280 and 280-300 A was studied. The microstructure of the coatings was characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The structure of the metallized layer is characterized by a non-uniform layered structure. The distribution and number of reinforcing phases significantly affect the wear resistance, hardness and strength of the treated surface of machine parts and mechanisms. The study of the structure of the wear-resistant coating and the influence of technological modes of arc metallization on its formation will help in the further development of this method of surface treatment of parts and machines. Keywords— wire arc metallization, cored wire, wear-resistant coating, modification, powder wire, structure, corundum