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Aqueous composition for coating grain-oriented steel

A water-based composition, grain orientation technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc.

Active Publication Date: 2021-09-17
伦勃朗涂料公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, these means do not include environmentally harmful metals such as chromium, which are present in many coating means for grain oriented steel.

Method used

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  • Aqueous composition for coating grain-oriented steel
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preparation example Construction

[0056] Another aspect of the present invention relates to a method for preparing an aqueous composition for coating grain-oriented steel, which method comprises the above-defined aluminum cation-releasing compound, manganese cation-releasing compound, dihydrogen phosphate, A step of mixing a compound of hydrogen phosphate and / or phosphate anion, a compound releasing colloidal silica and optionally an iron cation.

[0057] An ion-releasing compound is a compound capable of releasing ions (eg, metal ions such as aluminum) in water. The ion-releasing compound may be a salt, oxide, oxalate or hydroxide.

[0058] Another aspect of the invention relates to a method for coating grain oriented steel comprising applying an aqueous composition according to the invention or an aqueous composition preparable according to the method of the invention.

[0059] According to another preferred embodiment of the invention, the grain-oriented steel is base-coated with forsterite.

[0060] As i...

Embodiment 1

[0101] Example 1: Preparation of an aqueous composition for coating grain oriented steel

[0102] In a mixture of 400 g of 75% phosphoric acid and 135 ml of water, 78 g of aluminum trihydroxide, followed by 40 g of manganese(II) oxide and 7 g of iron(II) oxalate were dissolved to give a clear viscous phosphate-containing solution. The total weight of the resulting solution was 660 g. To 200 g of the phosphate-containing solution, 800 g of SiO with a solids content of 30% (average diameter 35 nm) was added. 2 spheres) of uncharged silica sol (colloidal silica) into a clear homogeneous preparation. The calculated composition is (Al 2 o 3 ) 2 (MnO) 2.2 (FeO) 0.2 (SiO 2 ) 53 (P 2 o 5 ) 6.3 (Composition 1).

[0103] at 5g / m 2 After being applied to a GO steel plate with a base coating (ie, a forsterite-coated grain-oriented steel plate), it was briefly dried in air and the layer was cured at 820° C. for 60 seconds.

[0104] By adjusting the stoichiometric ratios of th...

Embodiment 2

[0121] Embodiment 2: comparative composition:

[0122] In order to illustrate the advantages of the compositions according to the invention over other compositions from the prior art, corresponding tests were carried out using comparative compositions.

[0123] Comparative Composition 1 (Example B1 (Al,Mn) from WO2014 / 180610)

[0124] (Al 2 o 3 ) 8 (MnO) 2 (SiO 2 ) 20 (P 2 o 5 ) 27

[0125] Comparative composition 2 (example 1 from EP2264220Al (KMnO 4 ))

[0126] (Al 2 o 3 ) 5 (MnO 2 )(K 2 O) 0.5 (SiO 2 ) 29 (P 2 o 5 ) 5.5

[0127] Comparative composition 3 (Example 3 (Al,Cr) from DE2247269)

[0128] (Al 2 o 3 ) 2 (CrO 3 ) 2.4 (SiO 2 ) 12 (P 2 o 5 ) 6

[0129] Comparative Composition 4 (Example B3 (Al, Mn, Zn, Mg) from WO2014 / 180610)

[0130] (Al 2 o 3 ) 1.6 (MnO) 0.6 (ZnO) 0.2 (MgO) 2 (SiO 2 ) 16 (P 2 o 5 ) 5

[0131] Then, comparative compositions 1 to 4 were treated as described in Example 1 at 5 g / m 2 The amount of GO was ap...

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Abstract

The present invention relates to an aqueous composition for coating grain-oriented steel, comprising -aluminum cations, -manganese cations,-dihydrogen phosphate, hydrogen phosphate and / or phosphate anions, -colloidal silicon dioxide and-optionally iron cations, wherein the aluminum cations present in the composition, calculated as Al2O3, the manganese cations, calculated as MnO, the dihydrogen phosphate, hydrogen phosphate and / or phosphate anions, calculated as P2O5, colloidal silicon dioxide, calculated as SiO2, and optionally the iron cations, calculated as FeO, result in the molecular formula (Al2O3)2(MnO)1,8-2,4(FeO)0-0,2(P2O5)5-7(SiO2)>=30.

Description

technical field [0001] The present invention relates to aqueous compositions suitable for coating grain oriented steel ("GO" steel), for example used in transformers. Background technique [0002] In the prior art, a number of methods for producing grain-oriented electrical steel sheets have been described (see for example US5288736, US3159511, US5643370, JP2002-2112639, JP56-158816, DE1226129, DE1252220, DE 19745445, DE60219158, EP0485254, EP17 EP2022874, EP2264220). Grain oriented electrical steel sheets are used in transformers, generators and high performance generators to ensure the required soft magnetic properties. [0003] Grain oriented steel is essentially a low carbon steel (about 0.01% to about 0.1% carbon) with a high silicon content of about 2.5% to about 7.0%. Grain orientation is achieved through selected rolling, annealing and tempering steps. Sheets of this steel are ultimately dipole oriented in the rolling direction and can be magnetized. Such steel s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/18C23C22/20C23C22/74H01F1/147H01F1/18
CPCH01F1/14783C23C22/20C23C22/74H01F1/18C23C22/18
Inventor M·马赫诺J·谢伦伯格G·泰普勒特K·拉美什泰纳C·布雷特维泽
Owner 伦勃朗涂料公司
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