Effect of Sealing with Sealant Assisted by Cyclic Air Pressure Combined with Ultrasound on Friction and Wear Properties of Fe-based Amorphous Alloy Coating

Fe-based amorphous alloy coating was prepared by supersonic flame spraying on surface of 316L stainless steel. Using epoxy resin with silane coupling agent as sealant, the coating was sealed with sealant assisted by cyclic air pressure and ultrasound. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) were used to analyze the microstructure and composition of the coating. The dry friction and wear properties, corrosion and wear properties of the coating before and after sealing were also studied with a linear reciprocating friction testing machine. The results showed that the coating had a lamellar structure with porosity of about 7.04%, and average micro-hardness of 855.8 HV. The dry friction and wear mechanism of the coating was mainly abscission caused by local brittle fracture. The friction and wear properties of the sealed coating in the atmosphere and the corrosion and wear properties in 3.5% NaCl solution were improved. When 1% (mass fraction) silane coupling agent was added into the sealant, the coating had the best corrosion resistance and wear resistance.