Method for producing a grain-oriented electric 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

Inactive Publication Date: 2013-10-23
THYSSEN KRUPP STAHL AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] Attempts to remove chromium(VI) directly from phosphate solutions have failed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] Embodiment 1: the impact of chromium nitrate on chemical action in phosphate solution

[0106] The following phosphate solutions were prepared.

[0107]

[0108] Table 4

[0109] The chromium(VI)-free and acid etch inhibitor-free phosphate / silica sol mixtures according to document WO 2009 / 101129 show a clearly prominent interaction with free iron surfaces. An even more significantly enhanced interaction was generated by the addition of chromium(III) nitrate. The combination of the additives chromium(III) nitrate and diethylthiourea (DETH) resulted in a clear inhibition of the chemical action.

[0110] The inhibition of the chemical action allows the use in industrial coating plants, since contamination of the phosphating solution by iron ions is prevented.

[0111] Figure 10 The effect of chromium(III) nitrate and diethylthiourea (DETH) on the acid etching reaction of iron surfaces is shown.

Embodiment 2

[0112] Example 2: Influence of chromium nitrate in the insulating solution according to the invention on colloidal stability

[0113]

[0114]

[0115] table 5

[0116] Time curve measurements of the viscosity of the insulating solution at 50°C were carried out. Figure 11 Results are shown.

[0117] Insulating solutions with chromium(VI) show excellent solution stability. Removal of chromium(VI) compounds (solution 1) without any alternative measures resulted in a drastic deterioration of the solution stability, which made its use in industrial manufacturing processes impractical. Replacing chromium (VI) with chromium (III) also leads to a deterioration of solution stability. Like solution 1, such a solution is also unsuitable for practical use. However, if chromium(III) is used in the solution containing the colloidal stabilizer (A), the solution stability is maintained. Such solutions are suitable for use in industrial manufacturing processes.

Embodiment 3

[0118] Embodiment 3: the influence of the chromium nitrate in the phosphate solution on the tensile stress

[0119] Via the fired insulating layer, a tensile stress should be exerted on the ferromagnetic substrate, which should have a positive influence on the working structure and additionally reduce the alternating magnetization losses.

[0120] In order to demonstrate the advantages of the insulating solution according to the invention, the following solutions were formulated.

[0121]

[0122] Table 6

[0123] The solution was coated on a grain-oriented electrical steel strip with a size of 305 mm×60 mm, and fired at 850° C. for 2 minutes. In the fired state, the layer coating is always 3.5g / m 2 . Next, a tensile stress test is carried out. Figure 12 The results are summarized.

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PUM

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Abstract

The invention relates to a method for producing a grain-oriented electric strip coated with a phosphate layer, in that a phosphate solution comprising a colloid component and at least one colloid stabilizer (A), and / or at least one etching inhibitor (B) is applied to the electric strip, wherein the phosphate solution comprises at least one compound comprising chromium at the oxidation level III (Chromium (III) compounds). Grain-oriented electric strips produced by means of the method according to the invention are characterized by excellent optical properties and high tensile stress.

Description

technical field [0001] The invention relates to a method of manufacturing a grain oriented electrical steel strip covered with a phosphate layer. The invention further relates to a grain-oriented electrical steel strip covered with a phosphate layer, which can be produced by the method according to the invention, and to the use of such an electrical steel strip as a transformer core material. Background technique [0002] Grain-oriented electrical steel strip (German abbreviation ko-Elektroband) is observed in the figure as a ferromagnetic iron material, which exists in the form of a steel strip with a thickness of 0.15 mm to 0.50 mm, and has an electrically insulating layer system on the surface of the steel strip. figure 1 The schematic structure of a grain-oriented electrical steel strip is shown. [0003] In view of the application of grain-oriented electrical steel strip in transformers, high requirements are placed on the magnetic properties of the material. Such hig...

Claims

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Application Information

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IPC IPC(8): C23C22/74H01F1/147C21D8/12C04B28/34
CPCH01F27/245C23C22/74C04B28/34C04B28/346C21D8/1288C23C2222/10C21D8/1283H01F41/0233H01F3/02H01F1/14783C04B2111/00517H01F41/005Y10T428/12854C04B40/0263C04B2103/0018C04B2103/40C23C22/30C23C22/33
Inventor 克里斯托夫·霍尔茨阿普费尔斯特凡·帕尔克卡斯滕·舍佩尔斯海纳·施拉普尔斯
Owner THYSSEN KRUPP STAHL AG
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