Formation and Properties of Ni-Based Amorphous Metallic Coating Produced by HVAF Thermal Spraying
نویسندگان
چکیده
A highly dense Ni59Zr20Ti16Si2Sn3 partial amorphous metallic coating, about 500mm thick, was fabricated by means of HVAF (High Velocity Air Fuel) thermal spraying. Amorphous alloy powders produced by using gas atomization were used for HVAF thermal spraying to produce an amorphous metallic coating. Microstructural investigation showed that crystallization and oxidation occurred during thermal spraying. The volume fraction of amorphous phase in the coating is 44% as determined by using differential scanning calorimetry. Studies of the wear and corrosion properties of the resulting coating were also performed. The corrosion characteristics of the coating are sensitive to aqueous solutions selected. It exhibits good corrosion resistance in 0.05 kmol/m H2SO4 + 0.05 kmol/m 3 Na2SO4 aqueous solution due to low passive current density and wide passive region.
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