METHOD FOR INCREASING THE HARDNESS AND EROSION RESISTANCE OF VITREOUS ENAMEL COATINGS APPLIED TO CARBON STEELS

摘要

A method for improving hardness and erosion resistance of a vitreous enamel coating layer applied to carbon steel is provided to stably and effectively remove air-bubbles generated from an enamel coating of carbon steel manufactured by a conventional method, and a carbon steel thermal element with improved hardness and erosion resistance treated by the method is provided. A method for improving hardness and erosion resistance of a vitreous enamel coating layer applied to carbon steel comprises the following steps of: forming a vitreous enamel coating layer on a surface of the carbon steel by a conventional method comprising the steps of preparing an enamel coating solution by mixing silica, borax, sodium oxide, potassium oxide, aluminum oxide, nickel oxide, copper oxide and manganese oxide to improve corrosion resistance and erosion resistance(or wear resistance) of the carbon steel, dipping the carbon steel into the enamel coating solution, drying the carbon steel coated with the enamel coating solution, and firing the enamel coating solution-dried carbon steel; and treating the vitreous enamel coating layer under an argon atmosphere having a high temperature of 500 to 727 deg.C and a high pressure of 1000 to 1500 atmospheric pressures.