CN115449782A - Novel environment-friendly insulating coating liquid for oriented silicon steel and preparation method thereof - Google Patents
Novel environment-friendly insulating coating liquid for oriented silicon steel and preparation method thereof Download PDFInfo
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- CN115449782A CN115449782A CN202211191183.0A CN202211191183A CN115449782A CN 115449782 A CN115449782 A CN 115449782A CN 202211191183 A CN202211191183 A CN 202211191183A CN 115449782 A CN115449782 A CN 115449782A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/40—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
- C23C22/42—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates containing also phosphates
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Abstract
The invention provides novel environment-friendly insulating coating liquid for oriented silicon steel and a preparation method thereof, belonging to the technical field of preparation of insulating coatings for oriented silicon steel.
Description
Technical Field
The application relates to the technical field of preparation of oriented silicon steel insulating coatings, in particular to novel environment-friendly oriented silicon steel insulating coating liquid and a preparation method thereof.
Background
The insulating coatings are mainly divided into three categories of organic coatings, semi-inorganic coatings and inorganic coatings. The organic coating is thermally decomposed at high temperature, so that the organic coating is not suitable for the current silicon steel production. Semi-inorganic coatings have been developed following organic coatings, the basic composition of which comprises a portion of an organic resin and a host of inorganic compounds. The organic portion of the semi-inorganic coating is susceptible to decomposition at high temperatures, resulting in a reduction in the performance of the coating. Therefore, the insulating coating mainly used at present is an inorganic coating, and the coating solution using phosphate as a main film forming substance is the dominant variety at present.
At present, most inorganic phosphate insulating coatings are added with chromium element for keeping good performance, but Cr 6+ Has serious carcinogenicity and is not friendly to the environment. The existing method for improving the toxicity of the inorganic phosphate insulating coating causes poor adhesion and corrosion resistance of the coating.
Disclosure of Invention
The embodiment of the application provides a novel environment-friendly insulating coating liquid for oriented silicon steel and a preparation method thereof, and aims to solve the technical problems of poor adhesion and poor corrosion resistance of the existing environment-friendly inorganic phosphate insulating coating.
In a first aspect, the embodiment of the application provides a novel environment-friendly insulating coating liquid for oriented silicon steel, and an insulating coating composite material comprises the following components: phosphate, molybdate, silica sol, rare earth additive and water.
Further, the weight ratio of the phosphate, the molybdate, the silica sol, the rare earth additive and the water is (30-40): (1-7): (35-45): (0.1-1): (4-33.9).
Further, the phosphate is at least one of aluminum phosphate, aluminum dihydrogen phosphate, magnesium phosphate, zinc phosphate, calcium phosphate, strontium phosphate, cobalt phosphate, and nickel phosphate.
Further, the molybdate is one or two of ammonium molybdate, ammonium molybdate tetrahydrate and magnesium molybdate.
Further, the pH value of the silica sol is 9-11, and SiO is 2 The content of 29 to 31wt percentThe degree is 1.19 to 1.21g/cm 3 The particle size is 8-15 nm, and the viscosity is less than or equal to 7 mPa.
Further, the rare earth additive is at least one of a cerium compound and a yttrium compound.
In a second aspect, an embodiment of the present application provides a method for preparing a novel environment-friendly insulating coating solution for oriented silicon steel, where the method includes:
preparing molybdate solution and silica sol solution;
dissolving phosphate and a rare earth additive in water to obtain a mixed solution I;
adding the molybdate solution into the mixed solution I, and stirring until the molybdate solution is completely mixed to obtain a mixed solution II;
and adding the silica sol solution into the second mixed solution, and stirring to be uniform to obtain the novel environment-friendly insulating coating solution for the oriented silicon steel.
In a third aspect, embodiments of the present application provide an insulating coating formed from the novel environment-friendly insulating coating solution for oriented silicon steel of the first aspect.
In a fourth aspect, embodiments of the present application provide a method for preparing the insulating coating according to the third aspect, where the method for preparing the insulating coating includes:
covering the surface of a steel body with the novel environment-friendly insulating coating liquid for the oriented silicon steel, drying at 350-400 ℃ for 20-30 s, and then preserving heat at 780-820 ℃ for 90-120 s to obtain an insulating coating.
In a fifth aspect, embodiments of the present application provide an oriented silicon steel including an oriented silicon steel substrate and an insulating coating adhered to at least a portion of a surface of the oriented silicon steel substrate;
the insulating coating is the insulating coating of the third aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the embodiment of the application provides a coating composite liquid, which comprises five components of phosphate, molybdate, silica sol, a rare earth additive and water; when the composite material is applied to the surface of a steel body such as oriented silicon steel and the like, the combination of the silica sol and a phosphate film forming material fully utilizes the low-temperature bonding strength of the silica sol and the bonding performance of phosphate at medium and high temperatures, thereby improving the surface smoothness and bonding strength of a coating and the stability of the coating; the molybdate can ensure that the coating composite liquid is uniformly mixed and stably exists, the coating effect is ensured, and the corrosion resistance and the brightness of the coating can be improved; the rare earth elements can provide more active sites in the coating, improve the crystal nucleus generation rate of the phosphate coating, accelerate the film forming speed of the coating, enable the insulating coating to be more refined, improve the surface quality and further improve the corrosion resistance of the coating. Therefore, the coating composite liquid provided by the embodiment of the application can improve the adhesion and corrosion resistance of the environment-friendly inorganic phosphate insulating coating.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic flow chart of a preparation method of a coating composite liquid provided in an embodiment of the present application.
Detailed Description
The present invention will be specifically explained below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are illustrative of the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The insulating coatings are mainly divided into three categories, namely organic coatings, semi-inorganic coatings and inorganic coatings. The organic coating is thermally decomposed at high temperature, so that the organic coating is not suitable for the current silicon steel production. Semi-inorganic coatings have been developed following organic coatings, the basic composition of which comprises a portion of an organic resin and a host of inorganic compounds. The organic portion of the semi-inorganic coating is susceptible to decomposition at high temperatures, resulting in a reduction in the performance of the coating. Therefore, the insulating coating mainly used at present is an inorganic coating, and the coating solution using phosphate as a main film forming substance is the dominant variety at present.
At present, most inorganic phosphate insulating coatings are added with chromium element for keeping good performance, but Cr 6+ Has serious carcinogenicity and is not friendly to the environment. The existing method for improving the toxicity of the inorganic phosphate insulating coating causes poor adhesion and corrosion resistance of the coating.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
in a first aspect, the embodiment of the application provides a novel environment-friendly insulating coating liquid for oriented silicon steel, and an insulating coating composite material comprises the following components: phosphate, molybdate, silica sol, rare earth additive and water.
The embodiment of the application provides a novel environment-friendly insulating coating liquid for oriented silicon steel, and the coating composite liquid comprises five components of phosphate, molybdate, silica sol, a rare earth additive and water; when the composite material is applied to the surface of a steel body such as oriented silicon steel and the like, the combination of the silica sol and a phosphate film forming material fully utilizes the low-temperature bonding strength of the silica sol and the bonding performance of phosphate at medium and high temperatures, thereby improving the surface smoothness and bonding strength of a coating and the stability of the coating; the molybdate can ensure that the coating composite liquid is uniformly mixed and stably exists, the coating effect is ensured, and the corrosion resistance and the brightness of the coating can be improved; the rare earth elements can provide more active sites in the coating, improve the crystal nucleus generation rate of the phosphate coating, accelerate the film forming speed of the coating, enable the insulating coating to be more refined, improve the surface quality and further improve the corrosion resistance of the coating. Therefore, the coating composite liquid provided by the embodiment of the application can improve the adhesion and corrosion resistance of the environment-friendly inorganic phosphate insulating coating.
As an implementation manner of the embodiment of the invention, the weight ratio of the phosphate, the molybdate, the silica sol, the rare earth additive and the water is (30-40): (1-7): (35-45): (0.1-1): (4-33.9).
In the present application, the functions of controlling the amount relationship among the phosphate, the molybdate, the silica sol, the rare earth additive and the water are to prevent the reaction of the insulating coating composite liquid itself and to ensure the transparency and the timeliness of the insulating coating composite liquid (stability between the completion of the preparation of the insulating coating composite liquid and the coating). After the composite liquid is prepared into the insulating coating composite liquid, the interaction between the raw materials can stabilize the insulating coating composite liquid, for example, the silica sol needs phosphate to be fully dissolved, and the molybdate is added to stabilize the interconversion between phosphate ions.
As an embodiment of the embodiments of the present invention, the phosphate is at least one of aluminum phosphate, aluminum dihydrogen phosphate, magnesium phosphate, zinc phosphate, calcium phosphate, strontium phosphate, cobalt phosphate, and nickel phosphate.
In the application, phosphate is used as a film forming main body, so that the adhesion of the insulating coating to the silicon steel is better, the adhesion degree of the insulating layer and a magnesium silicate bottom layer can be improved, a disordered solidified body is easy to obtain, and the stress and the strain are easier to absorb so as to improve the performance of the coating.
As an implementation manner of the embodiment of the present invention, the molybdate is one or two of ammonium molybdate, ammonium molybdate tetrahydrate, and magnesium molybdate.
In the application, the molybdate has weak reducibility under an acidic condition, so that the stability of each component in the insulating coating composite liquid can be effectively maintained, the insulating coating composite liquid is prevented from generating strong water absorption before coating to cause stickiness of the insulating coating composite liquid, further obvious line defects and steel plate surface flowering phenomena occur in the coating process, the surface glossiness of the steel plate is reduced, and the corrosion resistance of the steel plate is damaged due to uneven coating.
As an embodiment of the present invention, the silica sol has a pH of 9 to 11 and SiO 2 The content is 29 to 31 weight percent, and the density is 1.19 to 1.21g/cm 3 The particle diameter is 8-15 nm, and the viscosity is less than or equal to 7 mPas.
In the present application, during the film-forming and curing process, siO suspended in the silica sol 2 The specific surface area of the colloidal particles is very large, so that the silica sol can be uniformly coated on the surface of a cemented substance, the high bonding strength at normal temperature is kept through self-drying film formation, the shrinkage and bubble phenomena easily occurring in the conventional coating sintering process are eliminated through the compounding of the silica sol and a phosphate film forming material, the formation of micropores is prevented, and the surface smoothness, the bonding strength and the stability of the coating are improved. SiO in silica sol 2 The content represents the purity of the silica sol, the pH value control range can ensure that phosphate is fully dissolved, and the average particle size control can ensure that water vapor is fully released and grid structure points are formed in the coating, drying and film forming processes.
As an embodiment of the embodiments of the present invention, the rare earth additive is at least one of a cerium compound and a yttrium compound.
In the application, the special electronic structure (4 f) of the rare earth element determines that the rare earth element has high chemical activity, almost can react with all chemical elements, volatilizes outer-layer electrons to show extremely high chemical activity, can stabilize phosphate radicals in the preparation process of an insulating coating composite liquid, strengthens the solubility of silica sol, and provides a key action site for composite film forming.
In a second aspect, an embodiment of the present application provides a method for preparing a novel environment-friendly insulating coating solution for oriented silicon steel, where the method includes:
preparing molybdate solution and silica sol solution;
dissolving phosphate and a rare earth additive in water to obtain a mixed solution I;
adding the molybdate solution into the mixed solution I, and stirring until the molybdate solution is completely mixed to obtain a mixed solution II;
and adding the silica sol solution into the second mixed solution, and stirring to be uniform to obtain the novel environment-friendly insulating coating solution for the oriented silicon steel.
In this application, to mixed solution one in add molybdate solution can make liquid become acidic, later add silica sol solution and can make silica sol dissolve completely, finally configure into water-soluble insulating coating complex liquid, can avoid dissolving inadequately, partial component is appeared, can avoid silica sol to take place the phase transition simultaneously, and the coating liquid is not limpid, and then influences the performance of coating.
In a third aspect, embodiments of the present application provide an insulating coating formed from the novel environment-friendly insulating coating solution for oriented silicon steel of the first aspect.
In this application, this insulating coating is formed by the first aspect the novel environmental protection insulating coating liquid of oriented silicon steel, have the surface quality that the outward appearance is leveled the homogeneity and is had no crack, make follow-up cutting process difficult for peeling off and powdering, have good adhesive force simultaneously, and corrosion resisting ability has obvious improvement.
In a fourth aspect, embodiments of the present application provide a method for preparing the insulating coating according to the third aspect, where the method for preparing the insulating coating includes:
covering the surface of a steel body with the novel environment-friendly insulating coating liquid of the oriented silicon steel, drying at 350-400 ℃ for 20-30 s, and then preserving heat at 780-820 ℃ for 90-120 s to obtain the insulating coating.
In the application, the prepared novel environment-friendly insulating coating liquid for the oriented silicon steel can be coated on the surface of the oriented silicon steel, and an insulating coating is prepared through drying and high-temperature curing.
In a fifth aspect, embodiments of the present application provide an oriented silicon steel including an oriented silicon steel substrate and an insulating coating attached to at least a portion of a surface of the oriented silicon steel substrate;
the insulating coating is the insulating coating of the third aspect.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the usual international standards, to the conventional conditions or to the conditions recommended by the manufacturer.
Example 1:
an insulating coating, comprising the steps of:
(1) Selecting raw materials: 30g of aluminum dihydrogen phosphate, 1g of magnesium molybdate, 0.1g of cerium oxide and 35g of silica sol (pH value is 9, siO) 2 The content of 29wt% and the density of 1.19g/cm 3 Selecting raw materials with the particle size of 8nm, the viscosity of 7mPa & s) and 33.9g of water for later use;
(2) Preparing a novel environment-friendly insulating coating liquid for oriented silicon steel:
preparing a magnesium molybdate solution and a silica sol solution;
dissolving aluminum dihydrogen phosphate and cerium oxide in water to obtain a first mixed solution;
adding the magnesium molybdate solution into the mixed solution I, and stirring until the magnesium molybdate solution is completely mixed to obtain a mixed solution II;
adding the silica sol solution into the mixed solution II, and stirring to be uniform to obtain a novel environment-friendly insulating coating solution of the oriented silicon steel;
(3) Preparing an insulating coating: covering the surface of the oriented silicon steel with the novel environment-friendly insulating coating liquid of the oriented silicon steel, drying at 380 ℃ for 25s, and then preserving heat at 800 ℃ for 105s to obtain the insulating coating.
Example 2:
an insulating coating, comprising the steps of:
(1) Selecting raw materials: according to 35g of aluminum dihydrogen phosphate, 3g of magnesium molybdate, 0.3g of cerium oxide and 40g of silica sol (pH value is 10, siO) 2 The content is 30wt%,The density was 1.20g/cm 3 Selecting raw materials with the particle size of 11nm, the viscosity of 5mPa & s) and 21.7g of water for later use;
(2) Preparing a novel environment-friendly insulating coating liquid for oriented silicon steel:
preparing a magnesium molybdate solution and a silica sol solution;
dissolving aluminum dihydrogen phosphate and cerium oxide in water to obtain a mixed solution I;
adding the magnesium molybdate solution into the mixed solution I, and stirring until the magnesium molybdate solution is completely mixed to obtain a mixed solution II;
adding the silica sol solution into the mixed solution II, and stirring to be uniform to obtain a novel environment-friendly insulating coating solution of the oriented silicon steel;
(3) Preparing an insulating coating: covering the surface of the oriented silicon steel with the novel environment-friendly insulating coating liquid of the oriented silicon steel, drying at 350 ℃ for 30s, and then preserving heat at 780 ℃ for 90s to obtain an insulating coating.
Example 3:
an insulating coating, characterized by the steps of:
(1) Selecting raw materials: 40g of aluminum dihydrogen phosphate, 4g of magnesium molybdate, 0.45g of cerium oxide and 45g of silica sol (pH value is 11, siO) 2 The content was 31wt%, and the density was 1.21g/cm 3 Selecting raw materials with the particle size of 15nm, the viscosity of 6mPa & s) and 10.55g of water for later use;
(2) Preparing novel environment-friendly insulating coating liquid of oriented silicon steel:
preparing a magnesium molybdate solution and a silica sol solution;
dissolving aluminum dihydrogen phosphate and cerium oxide in water to obtain a mixed solution I;
adding the magnesium molybdate solution into the mixed solution I, and stirring until the magnesium molybdate solution is completely mixed to obtain a mixed solution II;
adding the silica sol solution into the mixed solution II, and stirring to be uniform to obtain a novel environment-friendly insulating coating solution of the oriented silicon steel;
(3) Preparing an insulating coating: covering the surface of the oriented silicon steel with the novel environment-friendly insulating coating liquid of the oriented silicon steel, drying at 400 ℃ for 20s, and then preserving heat at 820 ℃ for 90s to obtain the insulating coating.
Example 4:
the raw materials in example 1 were changed to: 35g of aluminum dihydrogen phosphate, 5g of magnesium molybdate, 0.6g of cerium oxide, 40g of silica sol and 19.4g of water, the rest being the same as in example 1.
Example 5:
the raw materials in example 1 were changed to: 35g of aluminum dihydrogen phosphate, 6g of magnesium molybdate, 0.75g of cerium oxide, 40g of silica sol and 18.25g of water, the rest being the same as in example 1.
Example 6:
the raw materials in example 1 were changed to: 35g of aluminum dihydrogen phosphate, 7g of magnesium molybdate, 1g of cerium oxide, 40g of silica sol and 17g of water, the balance being the same as in example 1.
Comparative example 1:
the raw materials in example 1 were changed to: 30g of aluminum dihydrogen phosphate, 1.5g of cerium oxide, 35g of silica sol and 33.9g of water, the same procedure was repeated as in example 1.
30g of aluminum dihydrogen phosphate, 1g of magnesium molybdate, 0.1g of cerium oxide and 35g of silica sol (pH value is 9, siO) 2 The content was 30wt%, and the density was 1.19g/cm 3 Particle diameter of 8nm, viscosity of 7 mPas), and water 33.9g
Comparative example 2:
the raw materials in example 1 were changed to: 30g of aluminum dihydrogen phosphate, 12g of magnesium molybdate, 35g of silica sol and 33.9g of water, the same procedure was repeated as in example 1.
Comparative example 3:
the raw materials in example 1 were changed to: 30g of aluminum dihydrogen phosphate, 1g of magnesium molybdate, 35g of silica sol and 33.9g of water, the same procedure was repeated as in example 1.
The coating performance test of the oriented silicon steel with the insulating coating on the surface obtained in the examples and the comparative examples is performed, and the results are shown in table 1. The appearance of the insulating coating was judged by SEM (scanning electron microscope) observation. Adhesion the cracking and peeling of the coating on the surface of the steel strip was examined according to the method prescribed in GB2522-2007 test method for the adhesion of insulation resistance coatings on the surface of electrical steel sheets (strips). The insulation performance was tested electrochemically to deduce corrosion current and polarization resistance. Whether the surface is back-adhered or not can be judged by lightly touching the surface of the coating by using filter paper and judging whether the coating and the filter paper are adhered or not. The hardness test was carried out by a Vickers microhardness tester.
TABLE 1 Performance of environmentally friendly insulating coatings for oriented silicon steels
| Examples | Appearance of the product | Adhesion Property | Corrosion resistance | Hardness of | Whether the surface is back-adhered or not |
| Example 1 | Smooth and compact | Superior food | Superior food | Superior food | Whether or not |
| Example 2 | Smooth and compact | Youyou (an instant noodle) | Superior food | Youyou (an instant noodle) | Whether or not |
| Example 3 | Smooth and compact | Superior food | Superior food | Superior food | Whether or not |
| Example 4 | Smooth and compact | Youyou (an instant noodle) | Superior food | Youyou (an instant noodle) | Whether or not |
| Example 5 | Smooth and compact | Superior food | Superior food | Superior food | Whether or not |
| Example 6 | Smooth and dense | Superior food | Superior food | Youyou (an instant noodle) | Whether or not |
| Comparative example 1 | Unevenness of the surface | Good wine | Difference (D) | Difference (D) | Is that |
| Comparative example 2 | Unevenness of the surface | Good wine | Difference (D) | Difference (D) | Is that |
| Comparative example 3 | Unevenness of the surface | Good quality | Good wine | Good quality | Is that |
To sum up, the embodiment of the application provides a novel environment-friendly insulating coating liquid for oriented silicon steel, which does not contain organic matters or chromic anhydride, is relatively friendly to human body and environment, can improve the adhesiveness and corrosion resistance of an environment-friendly inorganic phosphate insulating coating, and has good appearance and excellent performance when being applied to the surface of the oriented silicon steel.
It should be understood that the endpoints of the ranges and any values disclosed herein are not limited to the precise range or value and that such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, the term "and/or" appearing herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.
The above description is merely illustrative of particular embodiments of the invention that enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The novel environment-friendly insulating coating liquid for the oriented silicon steel is characterized by comprising the following components: phosphate, molybdate, silica sol, rare earth additive and water.
2. The novel environment-friendly insulating coating solution for oriented silicon steel as claimed in claim 1, wherein the weight ratio of the phosphate, the molybdate, the silica sol, the rare earth additive and the water is (30-40): (1-7): (35-45): (0.1-1): (4-33.9).
3. The novel environment-friendly insulation coating solution for oriented silicon steel as claimed in claim 1, wherein the phosphate is at least one of aluminum phosphate, aluminum dihydrogen phosphate, magnesium phosphate, zinc phosphate, calcium phosphate, strontium phosphate, cobalt phosphate and nickel phosphate.
4. The novel environment-friendly insulating coating solution for oriented silicon steel as claimed in claim 1, wherein the molybdate is at least one of ammonium molybdate, ammonium molybdate tetrahydrate and magnesium molybdate.
5. The novel environment-friendly insulating coating solution for oriented silicon steel as claimed in claim 1, wherein the silica sol has a pH value of 9-11 and SiO 2 The content is 29 to 31 weight percent, and the density is 1.19 to 1.21g/cm 3 The particle size is 8-15 nm, and the viscosity is less than or equal to 7 mPa.
6. The novel environment-friendly insulating coating solution for oriented silicon steel according to claim 1, wherein the rare earth additive is at least one of a cerium compound and a yttrium compound.
7. The method for preparing the novel environment-friendly insulating coating solution for the oriented silicon steel as set forth in any one of claims 1 to 6, characterized in that the method comprises the following steps:
preparing molybdate solution and silica sol solution;
dissolving phosphate and a rare earth additive in water to obtain a mixed solution I;
adding the molybdate solution into the mixed solution I, and stirring until the molybdate solution is completely mixed to obtain a mixed solution II;
and adding the silica sol solution into the second mixed solution, and stirring to be uniform to obtain the novel environment-friendly insulating coating solution for the oriented silicon steel.
8. An insulating coating, characterized in that the insulating coating is formed by the novel environment-friendly insulating coating liquid for oriented silicon steel of any one of claims 1 to 6.
9. A method of preparing the insulative coating of claim 8, comprising:
covering the surface of a steel body with the novel environment-friendly insulating coating liquid for the oriented silicon steel, drying at 350-400 ℃ for 20-30 s, and then preserving heat at 780-820 ℃ for 90-120 s to obtain an insulating coating.
10. The oriented silicon steel is characterized by comprising an oriented silicon steel substrate and an insulating coating attached to at least part of the surface of the oriented silicon steel substrate;
the insulating coating is according to claim 8.
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| CN116516133A (en) * | 2023-04-13 | 2023-08-01 | 首钢智新迁安电磁材料有限公司 | Oriented silicon steel with uniform grain structure and magnetic property and preparation method thereof |
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| CN101705023A (en) * | 2008-12-30 | 2010-05-12 | 北方涂料工业研究设计院 | Chromium-free surface insulating paint containing rare earth element for silicon steel sheet |
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