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A chromium-free environment-friendly insulating coating for oriented silicon steel

A technology of oriented silicon steel and insulating coatings, applied in anti-corrosion coatings, fire-resistant coatings, coatings, etc., can solve problems such as environmental pollution by hexavalent chromium compounds, achieve excellent performance, refine magnetic domains, and avoid environmental pollution.

Inactive Publication Date: 2018-04-13
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This product solves the environmental pollution problem of hexavalent chromium compounds, is non-toxic to the environment and human body, and can meet the environmental protection requirements of countries and regions such as the European Union.

Method used

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  • A chromium-free environment-friendly insulating coating for oriented silicon steel
  • A chromium-free environment-friendly insulating coating for oriented silicon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A chromium-free environmental protection insulating coating for oriented silicon steel, which is composed of 1.2% sodium tungstate, 1.8% ammonium tungstate, 2% titanium oxysulfate, 36% aluminum dihydrogen phosphate aqueous solution (aluminum dihydrogen phosphate content 40wt%), 9% magnesium dihydrogen phosphate aqueous solution (magnesium dihydrogen phosphate content is 30wt%), 30% silica sol (SiO 2 The content is 20wt%), 20% deionized water are mixed and stirred evenly, and the required environmentally friendly insulating coating for oriented silicon steel is prepared.

[0028] The prepared insulating coating is coated on both sides of the oriented silicon steel surface by a roller coater. 2 Under a protective atmosphere, the insulating coating is formed by baking at 450°C for 55s and sintering at 800°C for 60s. The grain-oriented silicon steel sample with insulating coating was placed at 820°C, N 2 Keep it warm for 2 hours under a protective atmosphere, and perform ...

Embodiment 2

[0036] A chromium-free environmentally friendly insulating coating for oriented silicon steel, composed of 1.3% ammonium tungstate, 1.2% titanium oxysulfate, 27% aqueous solution of aluminum dihydrogen phosphate (the content of aluminum dihydrogen phosphate is 45wt%), 22.5 % magnesium dihydrogen phosphate aqueous solution (magnesium dihydrogen phosphate content is 35wt%), 38% silica sol (SiO 2 The content is 26wt%), 10% deionized water are mixed and stirred evenly, and the required environmentally friendly insulating coating for oriented silicon steel is prepared.

[0037] The prepared insulating coating is double-coated on the surface of oriented silicon steel by a roller coater, and is baked at 400°C for 30s and sintered at 780°C for 75s in an Ar protective atmosphere to form an insulating coating. The grain-oriented silicon steel sample with insulating coating was placed at 820°C, N 2 Keep it warm for 2 hours under a protective atmosphere, and perform stress relief anneali...

Embodiment 3

[0045] A chromium-free environmentally friendly insulating coating for oriented silicon steel, which is composed of 1% lithium tungstate, 1% sodium tungstate, 5% titanium oxysulfate, 33% aqueous solution of aluminum dihydrogen phosphate (aluminum dihydrogen phosphate content is 50wt%), 8% zinc dihydrogen phosphate aqueous solution (zinc dihydrogen phosphate content is 60wt%), 28% silica sol (SiO 2 The content is 30wt%), 24% deionized water is mixed according to the formula ratio and stirred evenly to prepare the required environmentally friendly insulating coating for oriented silicon steel.

[0046] The prepared insulating coating is coated on both sides of the oriented silicon steel surface by a roller coater. 2 Under a protective atmosphere, the insulating coating is formed by baking at 420°C for 70s and sintering at 820°C for 35s. The grain-oriented silicon steel sample with insulating coating was placed at 820°C, N 2 Keep it warm for 2 hours under a protective atmospher...

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Abstract

The invention discloses a chromium-free environment-friendly insulating coating for oriented silicon steel. The chromium-free environment-friendly insulating coating is prepared from the following components in percentage by mass: 1 to 7 percent of tungstate, 1 to 5 percent of titanyl sulfate, 25 to 50 percent of aqueous solution of dihydric phosphate, 25 to 50 percent of silica sol and 10 to 40 percent of deionized water, wherein the sum of mass percents is 100 percent, and the sum of the contents of the tungstate and the titanyl sulfate is 2 to 8 percent of total mass of the coating. After the oriented silicon steel is coated with the coating, baking, sintering and curing need to be performed in protective atmosphere such as N2 or Ar. The insulating coating disclosed by the invention does not contain hexavalent chromium compounds harmful to a human body and environment, and belongs to an environment-friendly product, and has the advantages of good insulating property, corrosion resistance, adhesive property, high temperature resistance and the like; in addition, an iron loss value of the oriented silicon steel can be reduced, and a coating layer does not get tacky after being placed in a room temperature environment for a long time.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a chrome-free environmental protection insulating coating for oriented silicon steel. Background technique [0002] Grain-oriented silicon steel is an important electrical steel, which is widely used in transformers, rectifiers, reactors and large motors, and is an indispensable and important functional material in the electric power, motor and electronics industries. Although the magnesium silicate bottom layer will be formed on the surface of grain-oriented silicon steel when it is annealed at high temperature, its interlayer resistance is not large enough. It is still necessary to apply insulating coating on the surface of grain-oriented silicon steel, and form an insulating coating by baking and sintering. In order to increase the interlayer resistance, thereby reducing the eddy current loss generated by grain-oriented silicon steel during use. In addition to good insulation properti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/25C09D1/00C09D7/61C09D5/18C09D5/08
CPCC09D1/00C09D5/08C09D5/18C09D7/61
Inventor 王晨龙佩栩肖小波丁浩王魁翁艺超毛朝武
Owner FUZHOU UNIV
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