Preparation Of Fe-based Amorphous Alloy Coating And Research On Its Microstructure And Properties

Fe-based amorphous alloy coating were prepared by two methods of arc spraying,combining powder core wire.With the help of scanning electron microscopy(SEM),X-ray diffraction(XRD),energy spectrometer(EDS)and other research methods,the coating microstructure morphology,phase structure and porosity were analyzed,and the microhardness,friction and the electrochemical corrosion performance of coatings were tested.The coating microstructure observed under SEM was typical lamellar structure compositing with the deformed flat particles.The joining between the coating and substrate was mechanical bond.The microstructure of coating fabricated by supersonic arc spraying was compacted and the bond among layers particles was stacked tightly with small amount of pores.The microstructure of coating fabricated by ordinary arc spraying existed more defects,such as sunken,microcrack.XRD results show that the partial crystallization in coatings by compared by two arc spraying occurred.The wear resistance of 20 steel and coatings was examined by the dry friction tests under different speed and load.The results show that the friction coefficient of the coating is smaller.The wear mechanism of 20 steel is adhesive wear.The coating is fatigue wear before the particles fall from coating and changes to abrasive wear after the particle fall off.Electrochemical experiments were employed to compare the corrosion the corrosion resistance behavior of the coatings and 20 steel in 3.5wt% NaCl solution as well as simulated acid soil solution.The analysis results shows that Fe-based amorphous alloy coating with supersonic arc spraying has the lowest corrosion potential,the highest electrochemical reaction resistance and the best corrosion resistance performance.