CN115678370A - Method for improving adhesiveness of silicon steel coating after bluing heat treatment - Google Patents
Method for improving adhesiveness of silicon steel coating after bluing heat treatment Download PDFInfo
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- CN115678370A CN115678370A CN202211461155.6A CN202211461155A CN115678370A CN 115678370 A CN115678370 A CN 115678370A CN 202211461155 A CN202211461155 A CN 202211461155A CN 115678370 A CN115678370 A CN 115678370A
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention belongs to the field of silicon steel heat treatment, and particularly relates to a method for improving the adhesiveness of a silicon steel coating after bluing heat treatment; the condition that the silicon steel coating drops can be reduced. The technical scheme comprises the following steps: carrying out alkaline washing on the surface of the silicon steel, wherein the cleanliness of the surface of the silicon steel after alkaline washing is higher than grade 4; the silicon steel surface adhesion coating comprises water-soluble organic resin, and the water-soluble organic resin comprises one or two of water-soluble acrylic resin, organic silicon modified acrylic resin, silicone acrylic resin, epoxy resin, styrene-acrylic resin and pure acrylic resin; the proportion of the organic cost in the water-soluble organic resin is 5-25%; the thickness of the coating is 0.2um to 0.8um.
Description
Technical Field
The invention belongs to the field of silicon steel heat treatment, and particularly relates to a method for improving the adhesiveness of a silicon steel coating after bluing heat treatment.
Background
Silicon steel is an important metal functional material, is mainly used as iron cores of various motors and transformers, and is an indispensable important soft magnetic alloy in the industries of electric power, electronics and military affairs. In order to effectively reduce the eddy current loss of the iron core, the surface of the silicon steel needs to be coated with an insulating coating to generate high impedance.
After the cold rolled silicon steel sheet is subjected to processing such as punching, shearing, bending and the like, mechanical stress and local plastic deformation are generated, so that the problems of magnetic deterioration, increase of motor magnetic loss and the like are caused. In order to improve the magnetic performance of the silicon steel after punching and shearing, the silicon steel sheet is generally subjected to annealing and bluing heat treatment. The annealing is mainly to eliminate residual stress and lattice distortion after punching and shearing to improve the magnetic performance of the silicon steel plate, and the temperature is generally 700-800 ℃ and is full nitrogen. Bluing is to form a layer of dense oxide film on the surface of silicon steel at high temperature, improve the insulation resistance and reduce the eddy current loss. The bluing heat treatment temperature is generally not higher than 570 ℃, and is an oxidizing atmosphere, and water vapor is generally fed into a furnace.
Generally, industrial motors and EI chip users adopt a heat treatment process of annealing only; most compressor and part motor users employ a process of bluing after annealing. In recent years, in order to avoid aluminum exposure conduction and reduce the heat treatment cost, some enterprises adopt a process of only bluing heat treatment. Huangchang et al studied the effect of the bluing process on the adhesion of the environmental-friendly coating on silicon steel, and focused on the effect of the bluing atmosphere, bluing temperature and bluing time on the adhesion of the coating. It was found that at 480 ℃ a bluing oxide layer starts to form, at N 2 The optimal bluing temperature is 510-570 ℃ under the humidifying atmosphere, the optimal bluing time is 105-120min, and the environment-friendly coating adhesion is good under the conditions. The oxidizing property of the user atmosphere is too strong, resulting in an excessively thick oxide layer and a decrease in adhesion.
Currently, most silicon steel coatings use semi-organic coatings; after annealing in a bluing oxidizing atmosphere, the coating is bent to obviously fall off, sometimes even if the coating is bent straightly, powder falls off, and when a compressor runs, a cooling circulation system is easy to block a pipeline, so that the problems of temperature rise, low efficiency and the like are caused. Therefore, how to improve the production process of the silicon steel coating, improve the heat resistance of the silicon steel coating and meet the requirement of adhesion of a user after only bluing heat treatment becomes a very important subject.
Disclosure of Invention
In order to overcome the defects in the related art, the invention provides a method for improving the adhesiveness of a silicon steel coating after bluing heat treatment, which can reduce the occurrence of the shedding of the silicon steel coating.
In order to achieve the technical purpose, the invention provides a method for improving the adhesiveness of a silicon steel coating after bluing heat treatment, which comprises the following steps: carrying out alkaline washing on the surface of the silicon steel, wherein the cleanliness of the surface of the silicon steel after alkaline washing is higher than grade 4; the silicon steel surface adhesion coating comprises water-soluble organic resin, wherein the water-soluble organic resin comprises one or two of water-soluble acrylic resin, organic silicon modified acrylic resin, silicone acrylic resin, epoxy resin, styrene-acrylic resin and pure acrylic resin; the proportion of the organic cost in the water-soluble organic resin is 5% -25%; the thickness of the coating is 0.2um to 0.8um.
Preferably, the water-soluble organic resin includes a silicone-modified acrylic resin.
Preferably, the proportion of the organic cost in the water-soluble organic resin is 6-15%.
Preferably, the cleanliness of the surface of the silicon steel after alkali washing is higher than grade 3.
Preferably, the thickness of the coating is 0.3um to 0.4um.
Compared with the prior art, the invention has the following beneficial effects:
by reasonably selecting the types of organic resin with excellent heat resistance, properly adjusting the proportion of organic components in the coating, optimizing the silicon steel annealing alkali washing process, reducing the thickness of the silicon steel coating, obviously improving the adhesion of the coating after bluing heat treatment, and increasing the adhesion grade from E grade to B grade.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the water-soluble acrylic resin and the organic silicon modified acrylic resin are selected to be compounded according to the mass ratio of 1. In order to improve the magnetic performance of the silicon steel after punching and shearing, the silicon steel sheet is subjected to bluing heat treatment. The bluing heat treatment temperature was 540 ℃ and the atmosphere was an oxidizing atmosphere, and water vapor was fed into the furnace.
Example 2:
selecting water-soluble organic silicon modified acrylic resin, controlling the proportion of organic components in the coating to be 8%, cleaning the surface of the silicon steel by adopting an imported liquid degreasing agent, enabling the surface cleanliness level of the silicon steel after alkaline cleaning to reach 2 levels, and controlling the thickness of the coating to be 0.3um, thereby producing a qualified non-oriented silicon steel product. In order to improve the magnetic performance of the silicon steel after punching and shearing, the silicon steel sheet is subjected to bluing heat treatment. The bluing heat treatment temperature was 540 ℃ and the atmosphere was an oxidizing atmosphere, and steam was fed into the furnace.
Example 3:
the water-soluble organic silicon modified acrylic resin and the epoxy resin are compounded according to the mass ratio of 1. And cleaning the surface of the silicon steel to ensure that the surface cleanliness level of the silicon steel after alkaline cleaning reaches 4 grades, and controlling the thickness of the coating to be 0.3um to produce a qualified non-oriented silicon steel product. In order to improve the magnetic performance of the silicon steel after punching and shearing, the silicon steel sheet is subjected to bluing heat treatment. The bluing heat treatment temperature was 540 ℃ and the atmosphere was an oxidizing atmosphere, and steam was fed into the furnace.
Example 4:
the water-soluble epoxy resin is selected, and the proportion of organic components in the coating is controlled to be 8%. And cleaning the surface of the silicon steel to ensure that the surface cleanliness level of the silicon steel after alkaline cleaning reaches 3 grades, and controlling the thickness of the coating to be 0.5um to produce a qualified non-oriented silicon steel product. In order to improve the magnetic performance of the silicon steel after punching and shearing, the silicon steel sheet is subjected to bluing heat treatment. The bluing heat treatment temperature was 540 ℃ and the atmosphere was an oxidizing atmosphere, and steam was fed into the furnace.
Example 5:
selecting water-soluble organic silicon modified acrylic resin, controlling the proportion of organic components in the coating to be 15%, cleaning the surface of the silicon steel, controlling the surface cleanliness level of the silicon steel after alkaline cleaning to reach 3 grades, and controlling the thickness of the coating to be 0.4um, thereby producing a qualified non-oriented silicon steel product. In order to improve the magnetic performance of the silicon steel after punching and shearing, the silicon steel sheet is subjected to bluing heat treatment. The bluing heat treatment temperature was 540 ℃ and the atmosphere was an oxidizing atmosphere, and steam was fed into the furnace.
Example 6:
selecting water-soluble organic silicon modified acrylic resin, controlling the proportion of organic components in the coating to be 10%, cleaning the surface of the silicon steel, controlling the surface cleanliness level of the silicon steel after alkaline cleaning to reach 3 grades, and controlling the thickness of the coating to be 0.3 mu m, thereby producing a qualified non-oriented silicon steel product. In order to improve the magnetic performance of the silicon steel after punching and shearing, the silicon steel sheet is subjected to bluing heat treatment. The bluing heat treatment temperature was 540 ℃ and the atmosphere was an oxidizing atmosphere, and steam was fed into the furnace.
Example 7:
selecting water-soluble organic silicon modified acrylic resin, controlling the proportion of organic components in the coating to be 8%, cleaning the surface of the silicon steel, controlling the surface cleanliness level of the silicon steel after alkaline cleaning to reach level 2, and controlling the thickness of the coating to be 0.3um, thereby producing a qualified non-oriented silicon steel product. In order to improve the magnetic performance of the silicon steel after punching and shearing, the silicon steel sheet is subjected to bluing heat treatment. The bluing heat treatment temperature was 520 ℃ and the atmosphere was an oxidizing atmosphere, and steam was fed into the furnace.
Example 8:
selecting water-soluble organic silicon modified acrylic resin, controlling the proportion of organic components in the coating to be 8%, cleaning the surface of the silicon steel, controlling the surface cleanliness level of the silicon steel after alkaline cleaning to reach 3 grades, and controlling the thickness of the coating to be 0.3 mu m, thereby producing a qualified non-oriented silicon steel product. In order to improve the magnetic performance of the silicon steel after punching and shearing, the silicon steel sheet is subjected to bluing heat treatment. The bluing heat treatment temperature was 540 ℃ and the atmosphere was an oxidizing atmosphere, and steam was fed into the furnace.
Comparative example 1:
selecting water-soluble acrylic resin, controlling the proportion of organic components in the coating to be 15%, cleaning the surface of the silicon steel, controlling the surface cleanliness level of the silicon steel to reach 4 grades after alkaline cleaning, and controlling the thickness of the coating to be 0.3 mu m, thereby producing a qualified non-oriented silicon steel product. In order to improve the magnetic performance of the silicon steel after punching and shearing, the silicon steel sheet is subjected to bluing heat treatment. The bluing heat treatment temperature was 540 ℃ and the atmosphere was an oxidizing atmosphere, and steam was fed into the furnace.
Comparative example 2:
selecting water-soluble acrylic resin, controlling the proportion of organic components in the coating to be 8%, cleaning the surface of the silicon steel, controlling the surface cleanliness level of the silicon steel to reach 4 grades after alkaline cleaning, and controlling the thickness of the coating to be 0.3 mu m, thereby producing a qualified non-oriented silicon steel product. In order to improve the magnetic performance of the silicon steel after punching and shearing, the silicon steel sheet is subjected to bluing heat treatment. The bluing heat treatment temperature was 540 ℃ and the atmosphere was an oxidizing atmosphere, and steam was fed into the furnace.
Comparative example 3:
selecting water-soluble acrylic resin, controlling the proportion of organic components in the coating to be 8%, cleaning the surface of the silicon steel to ensure that the surface cleanliness level of the silicon steel reaches 4 grades after alkaline cleaning, controlling the film thickness to be about 0.3 mu m, and producing the qualified non-oriented silicon steel product. In order to improve the magnetic performance of the silicon steel after punching and shearing, the silicon steel sheet is subjected to bluing heat treatment. The bluing heat treatment temperature was 520 ℃ and the atmosphere was an oxidizing atmosphere, and steam was fed into the furnace.
The following table shows the coating adhesion results after the bluing heat treatment of the examples and comparative examples:
in the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A method for improving the adhesiveness of a silicon steel coating after bluing heat treatment is characterized by comprising the following steps:
carrying out alkaline washing on the surface of the silicon steel, wherein the cleanliness of the surface of the silicon steel after alkaline washing is higher than grade 4;
the silicon steel surface adhesion coating comprises water-soluble organic resin, and the water-soluble organic resin comprises one or two of water-soluble acrylic resin, organic silicon modified acrylic resin, silicone acrylic resin, epoxy resin, styrene-acrylic resin and pure acrylic resin;
the proportion of the organic cost in the water-soluble organic resin is 5-25%;
the thickness of the coating is 0.2um to 0.8um.
2. The method of claim 1, wherein the water-soluble organic resin comprises an organosilicon-modified acrylic resin.
3. The method for improving the adhesion of the silicon steel coating after the bluing heat treatment according to claim 1 or 2, wherein the proportion of the organic cost in the water-soluble organic resin is 6-15%.
4. The method for improving the adhesion of the silicon steel coating after the bluing heat treatment of claim 1 or 2, wherein the cleanliness of the silicon steel surface after alkali washing is higher than grade 3.
5. The method for improving the adhesion of the silicon steel coating after the bluing heat treatment of claim 3, wherein the cleanliness of the silicon steel surface after the alkali washing is higher than grade 3.
6. The method for improving the adhesiveness of the silicon steel coating after the bluing heat treatment of claim 1, 2, or 5, wherein the thickness of the coating is 0.3um to 0.4um.
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Citations (6)
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| CN101168642A (en) * | 2007-10-25 | 2008-04-30 | 武汉钢铁(集团)公司 | Environment-friendly type insulated dope for cold rolling non-oriented silicon steel and preparation method for coat thereof |
| CN101209440A (en) * | 2006-12-27 | 2008-07-02 | 鞍钢股份有限公司 | Coating method of cold-rolled silicon steel chromium-free insulating coatings, coating rubber roll and coating liquid |
| CN103834263A (en) * | 2012-11-27 | 2014-06-04 | 宝山钢铁股份有限公司 | Semi-organic insulating coating paint for non-oriented silicon steel |
| CN104293008A (en) * | 2014-10-10 | 2015-01-21 | 北京科技大学 | Preparation method of environment-friendly semi-organic insulating coating for high silicon steel |
| CN106085071A (en) * | 2016-07-28 | 2016-11-09 | 湖北武洲新材料科技有限公司 | A kind of non-orientation silicon steel coatings and preparation method thereof |
| CN110240832A (en) * | 2019-03-07 | 2019-09-17 | 上海丰野表面处理剂有限公司 | A kind of non-orientation silicon steel chromium-free semi-organic insulating coated coating |
-
2022
- 2022-11-22 CN CN202211461155.6A patent/CN115678370A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101209440A (en) * | 2006-12-27 | 2008-07-02 | 鞍钢股份有限公司 | Coating method of cold-rolled silicon steel chromium-free insulating coatings, coating rubber roll and coating liquid |
| CN101168642A (en) * | 2007-10-25 | 2008-04-30 | 武汉钢铁(集团)公司 | Environment-friendly type insulated dope for cold rolling non-oriented silicon steel and preparation method for coat thereof |
| CN103834263A (en) * | 2012-11-27 | 2014-06-04 | 宝山钢铁股份有限公司 | Semi-organic insulating coating paint for non-oriented silicon steel |
| CN104293008A (en) * | 2014-10-10 | 2015-01-21 | 北京科技大学 | Preparation method of environment-friendly semi-organic insulating coating for high silicon steel |
| CN106085071A (en) * | 2016-07-28 | 2016-11-09 | 湖北武洲新材料科技有限公司 | A kind of non-orientation silicon steel coatings and preparation method thereof |
| CN110240832A (en) * | 2019-03-07 | 2019-09-17 | 上海丰野表面处理剂有限公司 | A kind of non-orientation silicon steel chromium-free semi-organic insulating coated coating |
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