Coating composition for forming insulating films, non-oriented electrical steel sheet with the coating composition coated thereon, and method for forming the insulating films on the steel sheet
A composition and coating technology, which is applied in the direction of insulators, anti-corrosion coatings, metal material coating technology, etc., can solve the problems of unsatisfactory aesthetics and other problems, and achieve the effects of excellent weldability, excellent corrosion resistance, and excellent insulating film properties
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example 1
[0055] A coating composition for forming an insulating film was prepared with different compositions per 100 g of phosphoric acid in an aluminum dihydrogen phosphate solution (DYP-30) as shown in Table 1 below, and then aged for 3 days. These coating compositions were then applied to non-oriented electrical steel sheets (0.5 mm thick and containing 1.0% Si). Next, these coated steel sheets were heat-treated at 550° C. for 30 seconds, whereby unoriented electrical steel sheets each coated with an insulating film about 2.1 μm thick were obtained.
[0056] For these coated steel sheets, the properties of the coated insulating film were measured, and the measurement results are listed in Table 2 below. Under this condition, the specific measurement method is as follows.
[0057] At this time, as shown in Table 2, the corrosion resistance was classified into: a case where no rust occurred on the surface of the insulating film; a case where rust was partially formed; and a case whe...
example 2
[0073] A film coating composition similar in composition to Example 1 in Example 1 was aged for 3 days. The coating composition was uniformly coated on a non-oriented electrical steel sheet (0.5 mm thick and containing 1.0% silicon) with different coating thicknesses. Then, these samples were annealed at 550°C for 30 seconds, so that the coating film changed as shown in Table 3 below. Next, measure film properties, such as dielectric strength and corrosion resistance, on non-oriented electrical steel sheets with different thicknesses of coating film, using TIG welding measurement (welding current: 150A, electrode: pure tungsten (3.2mm), electrode spacing: 0.35mm , and welding speed: 15mm / sec), and visually observe the appearance of beads after welding and the generation of pores.
[0074] In Table 3 below, when evaluating corrosion resistance, heat resistance, and weldability, if the evaluation value is excellent, it is indicated by ◯. On the other hand, if the value is inf...
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