Method for producing grain oriented electrical steel strip
An electrical steel strip, grain orientation technology, applied in transformer/inductor parts, inductor/transformer/magnet manufacturing, circuits, etc., can solve problems such as failure, and achieve the effect of small toxicity
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Embodiment 1
[0122] Example 1: Influence of Chromium Nitrate in Phosphate Solution on Chemical Effects
[0123] The following phosphate solutions were formulated.
[0124]
[0125]
[0126] Table 4
[0127] Phosphate / silica sol mixtures according to document WO 2009 / 101129, free of chromium(VI) and free of acid etching inhibitors, show a remarkably prominent interaction with free iron surfaces. With the addition of chromium(III) nitrate, an even more significantly enhanced interaction is generated. The combination of the additives chromium (III) nitrate and diethylthiourea (DETH) resulted in a clear inhibition of the chemical action.
[0128] The inhibition of chemical action allows use in industrial coating installations, since contamination of the phosphating solution by iron ions is prevented.
[0129] Figure 10 The effect of chromium (III) nitrate and diethylthiourea (DETH) on the acid etching reaction of iron surfaces is shown.
Embodiment 2
[0130] Example 2: Influence of chromium nitrate in insulating solution according to the present invention on colloidal stability
[0131]
[0132] table 5
[0133] Time profile measurements of viscosity were carried out for insulating solutions at 50°C. Figure 11 Results are shown.
[0134] Insulating solutions with chromium(VI) show excellent solution stability. Removal of the chromium(VI) compound (solution 1) without any alternatives resulted in a dramatic deterioration of solution stability, which made its use in industrial manufacturing processes impractical. Replacing chromium(VI) with chromium(III) also leads to deterioration of solution stability. Like solution 1, such a solution is also unsuitable for practical use. However, when chromium (III) is used in the solution containing the colloidal stabilizer (A), the solution stability is maintained. Such solutions are suitable for industrial manufacturing processes.
Embodiment 3
[0135] Example 3: Effect of Chromium Nitrate in Phosphate Solution on Tensile Stress
[0136] With the cauterized insulating layer, a tensile stress should be applied to the ferromagnetic substrate, which should have a positive effect on the working structure and, in addition, reduce the alternating magnetization losses.
[0137] To demonstrate the advantages of insulating solutions according to the present invention, the following solutions were formulated.
[0138]
[0139] Table 6
[0140] The solution was coated on a grain-oriented electrical steel strip in a size of 305 mm x 60 mm and fired at 850°C for 2 minutes. In the burnt state, the layer coating is always 3.5g / m 2 . Next, a tensile stress test is performed. Figure 12 The results are summarized.
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