CN115678381A - Chromium-free paint for steel and preparation method thereof - Google Patents
Chromium-free paint for steel and preparation method thereof Download PDFInfo
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- CN115678381A CN115678381A CN202211209407.6A CN202211209407A CN115678381A CN 115678381 A CN115678381 A CN 115678381A CN 202211209407 A CN202211209407 A CN 202211209407A CN 115678381 A CN115678381 A CN 115678381A
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Abstract
The invention discloses a chromium-free paint for steel and a preparation method thereof, belonging to the field of paint preparation, wherein the chromium-free paint for steel and the preparation method thereof comprise the following components in percentage by weight: 45-50% of alloy powder, 5.0-8.0% of alumina powder, 5-8% of boron carbide powder and the balance of epoxy resin liquid; the granularity of the alloy powder, the alumina powder and the boron carbide powder is 220-250 meshes. The alloy powder consists of aluminum-based alloy and iron-based alloy. The weight ratio of the aluminum-based alloy to the iron-based alloy is 1.1-0.3; the aluminum-based alloy comprises the following components in percentage by weight: 9 to 13 percent of Zn, 0.1 to 0.3 percent of Mg, 0.2 to 0.4 percent of Cd, 6 to 8 percent of Si, 0.1 percent of Ce, 0.5 to 0.7 percent of Nd, and the balance of Al; the weight percentage of the iron-based alloy is as follows: 0.22 to 0.28 percent of C, 0.90 to 1.20 percent of Si, 2.20 to 2.60 percent of Mn, 0.30 to 0.40 percent of Mo and 0.05 to 0.12 percent of V. The invention can improve the corrosion resistance of the coating and ensure that the coating has enough adhesiveness.
Description
Technical Field
The invention relates to the field of paint preparation, in particular to a chromium-free paint for steel and a preparation method thereof.
Background
A precoated steel sheet is generally produced using a two-coat two-bake system in which, after a chemical forming treatment as a pretreatment, a base steel sheet typified by a zinc-based galvanized steel sheet is coated, heated and cured with a primer coating, followed by coating, heating and curing of a top-coat coating, and the precoated steel sheet is cut and processed after the formation of a coating film, so that there are end faces and often cracks and scratches in the processed portion where metal is partially exposed and a reduction in corrosion resistance and peeling of the coating film easily occur in the portion. Therefore, in the past, a chromate-containing chemical forming treatment was performed on a base steel sheet, and further, an undercoating including a chromium-based rust preventive pigment was applied to ensure corrosion resistance and adhesion of a coating film on the base steel sheet.
However, in recent years, the adverse effect on the environment due to the dissolution of highly toxic chromium is considered to be a problem, and a chromium-free coating composition in which a non-chromium-based rust inhibitive pigment is used as an undercoat coating material is required.
Chinese patent No. CN201710396852.0 discloses a preparation method of a waterproof Dacromet coating, which comprises the steps of dispersing aluminum powder, zinc powder, calcium silicate and bentonite in deionized water to obtain a mixed solution I; then stirring and mixing the thermoplastic styrene-butadiene rubber, the acrylic resin, the isooctyl oleate and the ethylene-vinyl acetate copolymer to obtain a mixture; and finally, adding the mixture into the mixed solution I, adding a coupling agent, an auxiliary agent and a lubricant, heating the mixture in a reflux container to boil and reflux for a certain time, and cooling the mixture to room temperature to obtain the waterproof Dacromet coating. The Dacromet coating prepared by the preparation method provided by the invention has good adhesion performance and water resistance. But the adhesion performance is not yet high enough.
Therefore, the application provides a chromium-free paint for steel and a preparation method thereof.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a chromium-free coating for steel and a preparation method thereof, which can improve the corrosion resistance of the coating and ensure that the coating has enough adhesiveness.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The chromium-free paint for steel comprises the following components in percentage by weight: 45-50% of alloy powder, 5.0-8.0% of alumina powder, 5-8% of boron carbide powder and the balance of epoxy resin liquid; the granularity of the alloy powder, the alumina powder and the boron carbide powder is 220-250 meshes. The alloy powder consists of aluminum-based alloy and iron-based alloy. The weight ratio of the aluminum-based alloy to the iron-based alloy is 1.1-0.3;
the aluminum-based alloy comprises the following components in percentage by weight: 9 to 13 percent of Zn, 0.1 to 0.3 percent of Mg, 0.2 to 0.4 percent of Cd, 6 to 8 percent of Si, 0.1 percent of Ce, 0.5 to 0.7 percent of Nd, and the balance of Al;
the weight percentage of the iron-based alloy is as follows: 0.22 to 0.28 percent of C, 0.90 to 1.20 percent of Si, 2.20 to 2.60 percent of Mn, 0.30 to 0.40 percent of Mo, 0.05 to 0.12 percent of V, 0.1 to 0.4 percent of Ce, 0.5 to 0.7 percent of Nd, and the balance of Fe.
Further, the preparation method of the chromium-free paint for steel specifically comprises the following steps:
s1: preparing aluminum-based alloy powder;
s2: preparing iron-based alloy powder;
s3: and (4) preparing the coating.
Further, in S1, a scrap material of ZL401 is first taken and placed in an induction furnace for melting. And then adding rare earth elements Ce and Nd during melting. The melting temperature is 750-780 ℃, and then the alloy ingot is cast. The obtained alloy ingot comprises the following components: 9 to 13 percent of Zn, 0.1 to 0.3 percent of Mg, 0.2 to 0.4 percent of Cd, 6 to 8 percent of Si, 0.03 percent of Pr, 0.05 to 0.2 percent of Gd and the balance of Al.
Further, in the step S1, the alloy ingot is placed into a crucible of the induction furnace, and a bottom hole of the crucible is provided with a diameter of 12 mm. When the alloy in the crucible is melted, the alloy can flow out under the action of nitrogen pressure and just contacts with a rotating molybdenum alloy rotating wheel arranged at the lower part of the bottom hole of the crucible to form a melt-spun strip. The melting temperature is 760-790 ℃, the temperature is kept for 59min after melting, the nitrogen pressure is 1.11.3 atmospheric pressure, and the linear velocity of the edge of the molybdenum alloy rotating wheel is 1720m/s.
Further, in the step S1, the alloy strip is placed into a ball mill to be crushed into alloy powder with the granularity of 220-250 meshes for later use.
Further, in the step S2, 25SiMn2MoV scrap is first taken and then placed into an induction furnace for melting. Rare earth elements Ce and Nd are added during melting. The melting temperature is 1500-1560 ℃, and then the alloy ingot is cast. The obtained alloy ingot comprises the following components: 0.22 to 0.28 percent of C, 0.90 to 1.20 percent of Si, 2.20 to 2.60 percent of Mn, 0.30 to 0.40 percent of Mo, 0.05 to 0.12 percent of V, 0.1 to 0.4 percent of Ce, 0.5 to 0.7 percent of Nd, and the balance of Fe.
Further, in the step S2, the alloy ingot is placed into a crucible of the induction furnace, and a diameter of 12mm is set in a bottom hole of the crucible. When the alloy in the crucible is melted, the alloy can flow out under the action of nitrogen pressure and just contacts with a rotating molybdenum alloy rotating wheel arranged at the lower part of the bottom hole of the crucible to form a melt-spun strip. The melting temperature is 1520-1570 ℃, the temperature is kept for 38min after melting, the nitrogen pressure is 1.11.3 atmospheric pressure, and the linear velocity of the edge of the molybdenum alloy rotating wheel is 1922m/s.
Further, in the step S2, the alloy strip is placed into a ball mill to be crushed into iron-based alloy powder with the granularity of 200-250 meshes for later use.
Further, in the step S3, materials comprising, by weight, 45-50% of alloy powder, 5-8% of alumina powder, 5-8% of boron carbide powder, and the balance epoxy resin liquid are respectively weighed.
Further, in the step S3, the alloy powder, the alumina powder and the boron carbide powder are placed in a container and are subjected to dry stirring for 2025min, wherein the stirring revolution is 4050 revolutions per minute; then, slowly injecting the epoxy resin liquid into a container, and stirring for 2030min to obtain the chromium-free paint for steel. The number of stirring revolutions was 10001100 revolutions/minute. Wherein the granularity of the alloy powder, the alumina powder and the boron carbide powder is 220-250 meshes. Wherein the alloy powder consists of aluminum-based alloy and iron-based alloy, and the weight ratio of the aluminum-based alloy to the iron-based alloy is 1.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
1. the invention improves the heat dissipation function of the coating, further optimizes the adhesiveness of the coating and has no pollutants; and the preparation method has simple process and low production cost, and is suitable for industrial production.
Detailed Description
The technical scheme in the embodiment of the invention will be clearly and completely described below in combination with the embodiment of the invention; it is to be understood that the embodiments described are merely exemplary embodiments, rather than exemplary embodiments, and that all other embodiments may be devised by those skilled in the art without departing from the scope of the present invention.
In order to solve the technical problems, the chromium-free coating for the steel comprises the following components in percentage by weight: 45-50% of alloy powder, 5.0-8.0% of alumina powder, 5-8% of boron carbide powder and the balance of epoxy resin liquid; the granularity of the alloy powder, the alumina powder and the boron carbide powder is 220-250 meshes. The alloy powder consists of aluminum-based alloy and iron-based alloy. The weight ratio of the aluminum-based alloy to the iron-based alloy is 1.1-0.3;
the aluminum-based alloy comprises the following components in percentage by weight: 9 to 13 percent of Zn, 0.1 to 0.3 percent of Mg, 0.2 to 0.4 percent of Cd, 6 to 8 percent of Si, 0.1 percent of Ce, 0.5 to 0.7 percent of Nd, and the balance of Al;
the weight percentage of the iron-based alloy is as follows: 0.22 to 0.28 percent of C, 0.90 to 1.20 percent of Si, 2.20 to 2.60 percent of Mn, 0.30 to 0.40 percent of Mo, 0.05 to 0.12 percent of V, 0.1 to 0.4 percent of Ce, 0.5 to 0.7 percent of Nd, and the balance of Fe.
The method specifically comprises the following steps: the alloy powder of the present invention is composed of two parts. One is iron-base alloy powder, which is made of scrap steel and rare earth. The addition of Ce and Nd refines the crystal grains of the steel and improves the strength of the alloy powder. The other is aluminum-based alloy powder which is prepared by adding rare earth into waste aluminum alloy. And meanwhile, the addition of Ce and Nd refines the crystal grains of the steel and improves the strength of the alloy powder. When the iron-based alloy powder and the aluminum-based alloy exist at the same time, aluminum and zinc in the aluminum-based alloy protect not only a steel matrix but also the iron-based alloy powder in the coating, so that the framework of the coating is ensured not to be scattered in a corrosive environment. Because the aluminum oxide and the boron carbide are stable, the integrity of the coating is further ensured by the presence of the aluminum oxide and the boron carbide, so that the coating is ensured to have sufficient adhesiveness. In addition, the epoxy resin liquid has good compatibility with the alloy powder and the ceramic powder, and the alloy powder and the ceramic powder can be organically combined with the steel, so that the adhesiveness of the coating and a steel matrix is also ensured. In addition, because the aluminum oxide and the boron carbide have high hardness and wear resistance, the aluminum oxide and the boron carbide powder are components of the coating, so that the wear resistance of the coating is improved, and the alloy powder is protected; boron carbide has good heat conductivity, so that the heat dissipation function of the coating is improved, and the improvement of the adhesiveness is facilitated.
The following table shows the adhesion property MPa of the coating after different preparation proportions:
a preparation method of a chromium-free paint for steel specifically comprises the following steps:
s1: preparing aluminum-based alloy powder;
s2: preparing iron-based alloy powder;
s3: and (4) preparing the coating.
In the step S1, firstly, the waste material of ZL401 is put into an induction furnace to be melted. And then adding rare earth elements Ce and Nd during melting. The melting temperature is 750-780 ℃, and then the alloy ingot is cast. The obtained alloy ingot comprises the following components: 9 to 13 percent of Zn, 0.1 to 0.3 percent of Mg, 0.2 to 0.4 percent of Cd, 6 to 8 percent of Si, 0.03 percent of Pr, 0.05 to 0.2 percent of Gd and the balance of Al.
And S1, then, placing the alloy ingot into a crucible of the induction furnace, wherein the diameter of a bottom hole of the crucible is 12 mm. When the alloy in the crucible is melted, the alloy can flow out under the action of nitrogen pressure and just contacts with a rotating molybdenum alloy rotating wheel arranged at the lower part of the bottom hole of the crucible to form a melt-spun strip. The melting temperature is 760-790 ℃, the temperature is kept for 59min after melting, the nitrogen pressure is 1.11.3 atmospheric pressure, and the linear velocity of the edge of the molybdenum alloy rotating wheel is 1720m/s.
And in the S1, the alloy strip is put into a ball mill to be crushed into alloy powder with the granularity of 220-250 meshes for later use.
In S2, firstly, 25SiMn2MoV waste materials are taken and then placed into an induction furnace for melting. Rare earth elements Ce and Nd are added during melting. The melting temperature is 1500-1560 ℃, and then the alloy ingot is cast. The obtained alloy ingot comprises the following components: 0.22 to 0.28 percent of C, 0.90 to 1.20 percent of Si, 2.20 to 2.60 percent of Mn, 0.30 to 0.40 percent of Mo, 0.05 to 0.12 percent of V, 0.1 to 0.4 percent of Ce, 0.5 to 0.7 percent of Nd, and the balance of Fe.
And S2, then, placing the alloy ingot into a crucible of the induction furnace, wherein the diameter of a bottom hole of the crucible is 12 mm. When the alloy in the crucible is melted, the alloy can flow out under the action of nitrogen pressure and just contacts with a rotating molybdenum alloy rotating wheel arranged at the lower part of the bottom hole of the crucible to form a melt-spun strip. The melting temperature is 1520-1570 ℃, the temperature is kept for 38min after melting, the nitrogen pressure is 1.11.3 atmospheric pressure, and the linear velocity of the edge of the molybdenum alloy rotating wheel is 1922m/s.
And in the step S2, the alloy strip is put into a ball mill to be crushed into iron-based alloy powder with the granularity of 200-250 meshes for later use.
In S3, materials comprising 45-50% of alloy powder, 5-8% of alumina powder, 5-8% of boron carbide powder and the balance of epoxy resin liquid in percentage by weight are respectively weighed.
In the step S3, the alloy powder, the alumina powder and the boron carbide powder are placed in a container to be subjected to dry stirring for 2025min, wherein the stirring revolution is 4050 revolutions per minute; then, slowly injecting the epoxy resin liquid into a container, and stirring for 2030min to obtain the chromium-free paint for steel. The number of stirring revolutions was 10001100 revolutions/minute. Wherein the granularity of the alloy powder, the alumina powder and the boron carbide powder is 220-250 meshes. Wherein, the alloy powder consists of aluminum-based alloy and iron-based alloy, and the weight ratio of the aluminum-based alloy to the iron-based alloy is 1.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (10)
1. A chromium-free paint for steel is characterized in that: the weight percentage of each component is as follows: 45-50% of alloy powder, 5.0-8.0% of alumina powder, 5-8% of boron carbide powder and the balance of epoxy resin liquid; the granularity of the alloy powder, the alumina powder and the boron carbide powder is 220-250 meshes, the alloy powder consists of an aluminum-based alloy and an iron-based alloy, and the weight ratio of the aluminum-based alloy to the iron-based alloy is 1;
the aluminum-based alloy comprises the following components in percentage by weight: 9 to 13 percent of Zn, 0.1 to 0.3 percent of Mg, 0.2 to 0.4 percent of Cd, 6 to 8 percent of Si, 0.1 percent of Ce, 0.5 to 0.7 percent of Nd, and the balance of Al;
the weight percentage of the iron-based alloy is as follows: 0.22 to 0.28 percent of C, 0.90 to 1.20 percent of Si, 2.20 to 2.60 percent of Mn, 0.30 to 0.40 percent of Mo, 0.05 to 0.12 percent of V, 0.1 to 0.4 percent of Ce, 0.5 to 0.7 percent of Nd, and the balance of Fe.
2. The method for preparing a chromium-free paint for steel according to claim 1, wherein the method comprises the following steps:
s1: preparing aluminum-based alloy powder;
s2: preparing iron-based alloy powder;
s3: and (4) preparing the coating.
3. The method for preparing a chromium-free paint for steel according to claim 2, characterized in that: in the S1, firstly, the waste material of ZL401 is put into an induction furnace to be melted, then rare earth elements Ce and Nd are added into the melting process, the melting temperature is 750-780 ℃, and then the alloy ingot is cast, and the obtained alloy ingot comprises the following components: 9 to 13 percent of Zn, 0.1 to 0.3 percent of Mg, 0.2 to 0.4 percent of Cd, 6 to 8 percent of Si, 0.03 percent of Pr, 0.05 to 0.2 percent of Gd and the balance of Al.
4. The method for preparing a chromium-free paint for steel according to claim 3, characterized in that: in the step S1, the alloy ingot is placed into a crucible of an induction furnace, the diameter of a bottom hole of the crucible is 12mm, when the alloy in the crucible is melted, the alloy can flow out under the action of nitrogen pressure and just contacts a rotating molybdenum alloy rotating wheel arranged at the lower part of the bottom hole of the crucible to form a melt strip, the melting temperature is 760-790 ℃, the temperature is kept for 59min after melting, the nitrogen pressure is 1.11.3 atmospheric pressure, and the linear velocity of the edge of the molybdenum alloy rotating wheel is 1720m/S.
5. The method for preparing a chromium-free paint for steel according to claim 4, wherein: and in the step S1, the alloy strip is put into a ball mill to be crushed into alloy powder with the granularity of 220-250 meshes for later use.
6. The method for preparing a chromium-free paint for steel according to claim 2, characterized in that: in S2, firstly, 25SiMn2MoV waste materials are put into an induction furnace to be melted, rare earth elements Ce and Nd are added into the melting process, the melting temperature is 1500-1560 ℃, and then the mixture is cast into an alloy ingot, wherein the obtained alloy ingot comprises the following components: 0.22 to 0.28 percent of C, 0.90 to 1.20 percent of Si, 2.20 to 2.60 percent of Mn, 0.30 to 0.40 percent of Mo, 0.05 to 0.12 percent of V, 0.1 to 0.4 percent of Ce, 0.5 to 0.7 percent of Nd, and the balance of Fe.
7. The method for preparing a chromium-free paint for steel according to claim 6, characterized in that: in the S2, the alloy ingot is placed into a crucible of an induction furnace, the diameter of a bottom hole of the crucible is 12mm, when the alloy in the crucible is melted, the alloy can flow out under the action of nitrogen pressure and just contacts a rotating molybdenum alloy rotating wheel arranged at the lower part of the bottom hole of the crucible to form a melt-spun belt, the melting temperature is 1520-1570 ℃, the temperature is kept for 38min after melting, the nitrogen pressure is 1.11.3 atmospheric pressure, and the linear speed of the edge of the molybdenum alloy rotating wheel is 1922m/S.
8. The method for preparing a chromium-free paint for steel according to claim 7, wherein: and in the step S2, the alloy strip is put into a ball mill to be crushed into iron-based alloy powder with the granularity of 200-250 meshes for later use.
9. The method for preparing a chromium-free paint for steel according to claim 2, characterized in that: in S3, materials comprising 45-50% of alloy powder, 5-8% of alumina powder, 5-8% of boron carbide powder and the balance of epoxy resin liquid in percentage by weight are respectively weighed.
10. The method for preparing a chromium-free paint for steel according to claim 9, wherein: in the step S3, the alloy powder, the alumina powder and the boron carbide powder are placed in a container to be subjected to dry stirring for 2025min, wherein the stirring revolution is 4050 revolutions per minute; and then slowly injecting the epoxy resin liquid into a container, stirring for 2030min to prepare the chromium-free coating for steel, wherein the stirring revolution is 10001100 rpm, the granularity of the alloy powder, the alumina powder and the boron carbide powder is 220-250 meshes, the alloy powder consists of an aluminum-based alloy and an iron-based alloy, and the weight ratio of the aluminum-based alloy to the iron-based alloy is 1.
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| CN202211209407.6A CN115678381A (en) | 2022-09-30 | 2022-09-30 | Chromium-free paint for steel and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101875810A (en) * | 2010-07-15 | 2010-11-03 | 南京信息工程大学 | Corrosion resistant coating for metal magnesium and preparation method thereof |
| CN101891415A (en) * | 2010-07-15 | 2010-11-24 | 南京信息工程大学 | Corrosion resistance coating for steel and preparation method thereof |
| CN103642363A (en) * | 2013-12-12 | 2014-03-19 | 江西恒大高新技术股份有限公司 | Wear-resisting epoxy paint |
| CN104327675A (en) * | 2014-11-20 | 2015-02-04 | 北京天山新材料技术有限公司 | High-temperature-resistant and wear-resistant epoxy adhesive coating and preparation method thereof |
| CN105038504A (en) * | 2015-07-28 | 2015-11-11 | 南京航空航天大学 | Abrasion-resistant anti-permeability epoxy protective coating and preparation method thereof |
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2022
- 2022-09-30 CN CN202211209407.6A patent/CN115678381A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101875810A (en) * | 2010-07-15 | 2010-11-03 | 南京信息工程大学 | Corrosion resistant coating for metal magnesium and preparation method thereof |
| CN101891415A (en) * | 2010-07-15 | 2010-11-24 | 南京信息工程大学 | Corrosion resistance coating for steel and preparation method thereof |
| CN103642363A (en) * | 2013-12-12 | 2014-03-19 | 江西恒大高新技术股份有限公司 | Wear-resisting epoxy paint |
| CN104327675A (en) * | 2014-11-20 | 2015-02-04 | 北京天山新材料技术有限公司 | High-temperature-resistant and wear-resistant epoxy adhesive coating and preparation method thereof |
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