Corrosion behavior of Fe-based amorphous and nanocrystalline coatings on conductive roller in NaOH, H₂SO₄ and NaCl solution

FeCrMnMoWBCSi master alloy was used to prepare amorphous alloy powder by copper mould suction casting and aerosol spraying methods. Then, the coating was made by supersonic flame spraying. Nanocrystalline coatings, amorphous coatings and nanocrystalline biphase coatings were prepared by annealing three groups of samples in a box-type resistance furnace at different temperatures 320 ℃, 480 ℃ and 650 ℃ respectively. The amorphous alloy powder was observed by means of SEM electron microscope, and coatings were measured by X-ray diffraction and electrochemical test. The results of electrochemical corrosion behavior in NaOH, H₂SO₄ and NaCl solutions showed that when the conductive roller is coated with Fe-based HVOF, it is better to use nanocrystals after amorphous annealing in NaOH lye. When it is used in H₂SO₄ and NaCl solutions, the coating can be nanocrystals, or both amorphous and nanocrystals.