Method for processing non-oriented electrical steel material

A technology of grain-oriented electrical steel and treatment method, which can be applied in the direction of pretreatment surface, metal material coating process, device for coating liquid on the surface, etc. , to achieve the effect of improving coating adhesion, excellent coating performance and excellent scratch resistance

Pending Publication Date: 2020-06-23
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, pickling with weak acid is followed by post-cleaning, especially the surface of the phosphating film produced only by phosphoric acid is loose, which affects the quality of surface treatment.
At the same time, it is mainly used in organic and inorganic salt coatings, and the dry film coating amount is controlled at 0-4g / m 2 , preferably 1.5-2.8g / m 2 If the amount of coating is too large, the adhesion of the coating will be greatly reduced
[0005] Chinese Patent Application No. 201110297973.2 discloses the production method of non-oriented silicon steel with thickened semi-organic coating. Through the preparation of coating liquid and the control of coating coating baking, it solves the problem of rough surface of non-oriented electrical steel coating, deterioration of adhesion, coating Coating performance problems with yellowish color
This patent is only a conventional production method of controlled coating and baking. With a film thickness of 2-10 μm, the coating adhesion of the product needs to be further improved, and the coating is prone to peeling off.

Method used

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  • Method for processing non-oriented electrical steel material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] After cold rolling and annealing, the surface of the non-oriented electrical steel strip is clean and clean, and enters the strip surface treatment process. The strip is immersed in a surface treatment liquid tank containing 5wt% phosphoric acid and 1.0wt% silane coupling agent for 3s. Squeeze the polyurethane material with a squeeze roll, press the squeeze roll with a force of 10kg, and dry it with hot air at 35°C for 3 seconds to obtain a steel strip with a phosphating film on the surface with a thickness of 20nm.

[0032] The electrical steel plate enters the coating chamber, and the specific gravity of the coating liquid is 1.02g / m 2 , Viscosity 12 seconds, using a two-roller coating machine, the target film thickness of one-sided dry film is 0.3μm, and then baked in a baking oven at 350°C for 30s, the product coating adhesion and other properties are good.

Embodiment 2

[0034] After cold rolling and annealing, the surface of the non-oriented electrical steel strip is clean and clean, and enters the strip surface treatment process. The strip is immersed in a surface treatment liquid tank containing 50wt% phosphoric acid and 20wt% silane coupling agent for 35s. Two pairs of Squeeze with a squeeze roller made of polyurethane, with a pressure of 0.5kg, and dry with hot air at 90°C for 25s to obtain a steel strip with a phosphating film on the surface with a thickness of 300nm.

[0035] The electrical steel plate enters the coating chamber, and the specific gravity of the coating liquid is 1.8g / m 2 , Viscosity 150 seconds, using a three-roller coating machine, the target film thickness of one-sided dry film is 10μm, and then baked in a baking oven at 500°C for 70s, the product coating adhesion and other properties are good.

Embodiment 3

[0037] After cold rolling, the surface of the non-oriented electrical steel strip after annealing is clean, and enters the strip surface treatment process. The strip is immersed in a surface treatment liquid tank containing 25wt% phosphoric acid and 8wt% silane coupling agent for 10s. Two pairs of Squeeze with a squeeze roller made of polyurethane, with a pressure of 5kg, and dry with hot air at 55°C for 20s to obtain a steel strip with a phosphating film on the surface with a thickness of 200nm.

[0038] The electrical steel plate enters the coating chamber, and the specific gravity of the coating liquid is 1.5g / m 2 , Viscosity 120 seconds, using a three-roller coating machine, the target film thickness of one-sided dry film is 5.0μm, and then baked in a baking oven at 350°C for 40s, the product coating adhesion and other properties are good.

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Abstract

The invention relates to a method for processing a non-oriented electrical steel material. The method includes the following steps that S1, after the surface of a non-oriented electrical steel strip after cold-rolling and annealing is cleaned, the surface is treated with treating fluid and dried, and a phosphating film is formed on the surface of the non-oriented electrical steel strip; and S2, after the dried non-oriented electrical steel strip is coated with water-soluble insulating paint, the non-oriented electrical steel strip is roasted at a temperature of 350-500 DEG C, and a coating film with the single-sided dry film thickness of 0.3-10 [mu]m is formed on the surface of the non-oriented electrical steel strip. Compared with the prior art, the method for processing the non-orientedelectrical steel material has the following beneficial effects that through the surface treatment of strip steel, coating fluid parameters are adjusted, a coating process and a steel strip roasting process are formulated, good coating operation and excellent coating performance are achieved, and especially the coating adhesion, pencil hardness and scratch resistance are excellent. Meanwhile, for products with the coating film thickness of less than 2 [mu]m, the coating adhesion is significantly improved after annealing and bluing.

Description

technical field [0001] The invention relates to a non-oriented electrical steel production process, in particular to a treatment method for a non-oriented electrical steel material with good coating adhesion. Background technique [0002] Non-oriented electrical steel products are used in compressors, motors, large-scale thermal power, hydropower, nuclear power and other fields. Users have high requirements for the insulation performance of the coating on the surface of electrical steel products, so it is necessary to coat a certain thickness of insulating coating on the surface of the steel plate. Layer adhesion is one of the important indicators for evaluating coating performance. [0003] For coated products below 2μm, the adhesion of the coated product, especially after annealing and bluing treatment, is poor, which does not meet the user's requirements; for coated products larger than 2μm, the adhesion of the sample after coating and baking Poor, especially the coating...

Claims

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Application Information

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IPC IPC(8): B05D7/14B05D3/10B05D3/04B05D3/02C23C22/06
CPCB05D7/14B05D3/0254B05D3/0263B05D3/0413B05D3/102C23C22/06C23C2222/20
Inventor 肖盼邹忠魁陈晓沈科金
Owner BAOSHAN IRON & STEEL CO LTD
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