Abstract: The influence of coating liquid with solid content of 19.5 %-35 % on the coating amount, insulation, corrosion resistance, heat resistance and micro morphology of the coating were studied by means of interlayer resistance meter, RX-400 film thickness/weight meter, neutral salt spray test, high temperature furnace and scanning electron microscope. The results showed that the coating film thickness was directly proportional to the solid content,and the corresponding coating thickness range for solid content is 0.65-2.33 μm under the conditions of this experiment.The maximum heat resistance temperature of the coating was 800 ℃. After the heat resistance test, the insulation resistance decreased by about 50 %.The maximum corrosion resistance time could reach 12 hours, and thin coatings were easily penetrated by chloridion(Cl-), resulting in poor corrosion resistance compared to thick coatings. Thick coatings were prone to drying holes under high temperatures drying, which reduced the corrosion resistance.The coating with the solid content of 25.27 % has better performance under this process.

Key words: non-oriented silicon steel, protection coating, solid content