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Chromium-free insulating coated electrical steel strip and production method thereof

A technology of insulating coating and electrical steel strip, applied in the field of electrical steel, can solve the problems of coating peeling, iron loss rise, interlayer resistance drop, etc., and achieve the effect of good toughness and dense structure

Active Publication Date: 2015-08-26
重庆万达薄板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the impact of chromium-containing coatings on the environment and people's health, practitioners at home and abroad have done a lot of research work and developed various chromium-free coatings. The polymerization effect of the chromium component has poor film-forming performance and poor adhesion to the steel strip substrate. When the product is punched, the edge of the punched sheet will have a phenomenon of coating peeling off, making the interlayer after stacking The resistance decreases, which in turn increases the iron loss and deteriorates energy saving
Therefore, it has not been used in a substantial large area, and most of them stay in the stage of experiment or small batch trial production

Method used

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  • Chromium-free insulating coated electrical steel strip and production method thereof

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Comparison scheme
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Embodiment 1

[0024] Such as figure 1 As shown, a chromium-free insulating coated electrical steel strip, including a steel strip substrate 1, a silicon oxide film 2, SiO 2 and Fe mixture film 3 and silicon-containing chromium-free insulating coating 4, wherein the surface of the steel strip substrate 1 is uneven, and the surface roughness of the steel strip substrate 1 is Re=0.4-0.8um, which is selected in this embodiment The surface roughness of the steel strip substrate 1 is 0.4um. Cover a layer of silicon oxide film 2 on the surface of the steel strip substrate 1, and the weight of the silicon oxide film 2 on both sides is 8-12mg / m 2 , the weight of the silicon oxide film 2 on both sides in the present embodiment is 8mg / m 2 , the silicon oxide film 2 penetrates into the depressions on the surface of the steel strip substrate 1 . The surface of the silicon oxide film 2 is covered with a layer of SiO 2 and Fe mixture film 3, both sides of the SiO 2 The weight of the mixture film 3 wi...

Embodiment 2

[0026] Such as figure 1 As shown, a chrome-free insulating coated electrical steel strip, including a steel strip substrate 1, a silicon oxide film 2, SiO 2 and Fe mixture film 3 and silicon-containing chromium-free insulating coating 4, wherein the surface of the steel strip substrate 1 is uneven, and the surface roughness of the steel strip substrate 1 is Re=0.4-0.8um, which is selected in this embodiment The surface roughness of the steel strip substrate 1 is 0.8um. Cover a layer of silicon oxide film 2 on the surface of the steel strip substrate 1, and the weight of the silicon oxide film 2 on both sides is 8-12mg / m 2 , the weight of the silicon oxide film 2 on both sides in this embodiment is 12 mg / m 2 , the silicon oxide film 2 penetrates into the depressions on the surface of the steel strip substrate 1 . The surface of the silicon oxide film 2 is covered with a layer of SiO 2 and Fe mixture film 3, both sides of the SiO2 The weight of the mixture film 3 with Fe is ...

Embodiment 3

[0028] Such as figure 1 As shown, a chromium-free insulating coated electrical steel strip, including a steel strip substrate 1, a silicon oxide film 2, SiO 2 and Fe mixture film 3 and silicon-containing chromium-free insulating coating 4, wherein the surface of the steel strip substrate 1 is uneven, and the surface roughness of the steel strip substrate 1 is Re=0.4-0.8um, which is selected in this embodiment The surface roughness of the steel strip substrate 1 is 0.6um. Cover a layer of silicon oxide film 2 on the surface of the steel strip substrate 1, and the weight of the silicon oxide film 2 on both sides is 8-12mg / m 2 , the weight of the silicon oxide film 2 on both sides in this embodiment is 11 mg / m 2 , the silicon oxide film 2 penetrates into the depressions on the surface of the steel strip substrate 1 . The surface of the silicon oxide film 2 is covered with a layer of SiO 2 and Fe mixture film 3, both sides of the SiO 2 The weight of the mixture film 3 with Fe...

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Abstract

The invention discloses a chrome-free insulating coating electrical steel strip, which comprises a steel strip matrix of which the surface is uneven. A silicon oxide film is formed on the surface of the steel strip matrix through oxidization and permeates into a recess in the surface of the steel strip matrix; a mixture film of SiO2 and Fe covers the surface of the silicon oxide film; a silicon-containing chrome-free insulating coating coats the mixture film of SiO2 and Fe. The invention also discloses a method for producing the chrome-free insulating coating electrical steel strip. The method comprises the following steps: performing cold rolling on a steel strip by a roughening roller before a process of controlling the surface roughness, performing electrolytic degreasing by a silicon-containing degreasing solution, performing annealing treatment, and finally, performing roll coating with the silicon-containing chrome-free insulating coating. Therefore, the chrome-free insulating coating electrical steel strip has a non-toxic property, the chrome-free insulating layer is firm in adhesion and unlikely to drop, and the electrical steel strip has the characteristics of simplicity in production, low production cost and the like.

Description

technical field [0001] The invention belongs to the technical field of electrical steel, and in particular relates to a chromium-free insulating coating electrical steel strip and a production method thereof. Background technique [0002] At present, non-oriented electrical steel belt is the main electromagnetic material used in motors, and its surface must be coated to achieve insulation. For a long time, the coatings used on the surface of electrical steel strips contain chromate components. The main reason is that hexavalent chromate can be reduced to trivalent chromate. During this reaction process, polymerization occurs, and the molecules attract each other to form a water-insoluble insulating coating film, which can not only meet the requirements of electrical steel coating Various needs such as adhesion, and the product has good corrosion resistance. [0003] However, chromium is an element strictly restricted by EU environmental protection standards. Chromium has s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/092B32B9/04B32B27/06B05D7/14B05D7/24B05D3/02
Inventor 许秀飞黄伟九
Owner 重庆万达薄板有限公司