CN114289281A - Method for preparing anti-blackening aluminium-zinc-magnesium product and product prepared by method - Google Patents
Method for preparing anti-blackening aluminium-zinc-magnesium product and product prepared by method Download PDFInfo
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- CN114289281A CN114289281A CN202111454047.1A CN202111454047A CN114289281A CN 114289281 A CN114289281 A CN 114289281A CN 202111454047 A CN202111454047 A CN 202111454047A CN 114289281 A CN114289281 A CN 114289281A
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- Prior art keywords
- resistant
- zinc
- magnesium
- blackening
- product
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- 238000000034 method Methods 0.000 title claims abstract description 22
- -1 aluminium-zinc-magnesium Chemical compound 0.000 title claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 41
- 239000011248 coating agent Substances 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 238000001035 drying Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 6
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910000077 silane Inorganic materials 0.000 claims abstract description 4
- 238000005238 degreasing Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910018571 Al—Zn—Mg Inorganic materials 0.000 claims description 3
- 238000000861 blow drying Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001723 curing Methods 0.000 claims description 2
- PGTXKIZLOWULDJ-UHFFFAOYSA-N [Mg].[Zn] Chemical compound [Mg].[Zn] PGTXKIZLOWULDJ-UHFFFAOYSA-N 0.000 abstract 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 7
- 229910052749 magnesium Inorganic materials 0.000 description 7
- 239000011777 magnesium Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007761 roller coating Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
Abstract
The invention discloses a method for preparing an aluminum-zinc-magnesium product with blackening resistance and a product prepared by the method, wherein the method comprises the following steps: coating a fingerprint-resistant coating on the surface of a hot-dip aluminum-zinc-magnesium-plated steel plate, wherein the fingerprint-resistant coating is a single-component water-based coating and comprises the following components in percentage by mass: 9-10% of polyurethane resin, 4-5% of silane, 0.5-1.5% of wax and the balance of water; and heating and drying the hot-dip aluminum-zinc-magnesium-plated steel plate coated with the wet film by using an infrared oven to completely solidify the fingerprint-resistant coating to form a fingerprint-resistant film uniformly covering the surface of the steel plate. The invention improves the blackening resistance of the hot-dip aluminum-plated zinc-magnesium fingerprint resistant product, so that the surface of the steel plate does not blacken obviously within 6 months.
Description
Technical Field
The invention relates to the technical field of steel production processes, in particular to a method for preparing an anti-blackening aluminum-zinc-magnesium product and a product prepared by the method.
Background
As early as the early stage of the 20 th century, the Bosger iron and Steel company has led to the introduction of hot-dip aluminum-zinc-magnesium-plated fingerprint-resistant products, which are superior to conventional hot-dip aluminum-zinc-plated products in corrosion resistance, acid resistance, alkali resistance, etc., and are well received by customers. However, the product has a big defect that the product is easy to be blackened because magnesium (which is more active) is added into the product and is easy to react with oxygen in the air. Even if a layer of fingerprint-resistant film is coated on the surface of the aluminum-zinc-magnesium product, the fingerprint-resistant film cannot play a role in isolation, and the surface of the product still blackens. The blackening of the surface of the material does not affect the performance, but affects the beauty and has frustrated development prospect.
At present, in order to improve the blackening performance of aluminum, zinc and magnesium products produced by domestic steel mills, the blackening resistance of hot-dip aluminum, zinc and magnesium plated fingerprint resistant products is improved by developing a high-density surface treating agent to coat the surface of a steel plate. The surface of the aluminum-zinc-magnesium product is coated with a common surface treating agent, so that the problem of surface blackening of the aluminum-zinc-magnesium product in a short period (generally not more than 7 days) can be solved, and the requirement of a client can not be met (the client expects that the surface of the material can not be blackened in 6 months).
Accordingly, those skilled in the art have endeavored to develop a method for preparing a blackening resistant aluminum zinc magnesium product and a product prepared by the method to overcome the above-mentioned disadvantages.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is how to improve the blackening resistance of hot-dip aluminum-zinc-magnesium fingerprint resistant products, so that the surface of the steel plate does not blacken obviously within 6 months.
In order to achieve the above object, the present invention provides a method for preparing a blackening resistant Al-Zn-Mg product, which comprises the following steps:
step 1, coating a fingerprint-resistant coating on the surface of a hot-dip aluminum-zinc-magnesium-plated steel plate, wherein the fingerprint-resistant coating is a single-component water-based coating and comprises the following components in percentage by mass: 9-10% of polyurethane resin, 4-5% of silane, 0.5-1.5% of wax and the balance of water;
and 2, heating and drying the hot-dip aluminum-zinc-magnesium-plated steel plate coated with the wet film by using an infrared oven to completely cure the fingerprint-resistant coating to form a fingerprint-resistant film uniformly covering the surface of the steel plate.
Further, the step 1 further comprises: and degreasing, cleaning and blow-drying the hot-dip aluminum-zinc-magnesium-plated steel plate before coating.
Further, the coating in the step 1 adopts a roll coating mode.
Further, the coating in the step 1 is carried out at a temperature of 0-40 ℃.
Further, the furnace temperature of the infrared oven in the step 2 is 300-350 ℃.
Further, the infrared oven in the step 2 comprises a drying tunnel, and the drying tunnel is used for conveying the hot-dip aluminum-zinc-magnesium-plated steel plate coated with the wet film.
Furthermore, the peak temperature of the drying tunnel treatment metal is more than 100 ℃.
Further, the step 2 specifically comprises the step of conveying the hot-dip aluminum-zinc-magnesium-plated steel plate coated with the wet film through a drying tunnel of an infrared oven to perform heating, drying and curing, wherein when the steel plate leaves the infrared oven, the temperature of the steel plate is 90-100 ℃.
Further, the thickness of the fingerprint-resistant film formed on the surface of the steel plate in the step 2 is 1.0 to 1.2 μm.
The invention also provides a product prepared by the method for preparing the blackening-resistant aluminum-zinc-magnesium product, wherein the color difference delta E value of the surface of the product within 6 months is less than 5.
The invention has the beneficial effects that:
(1) developing a more compact fingerprint-resistant coating on the surface of the steel plate to isolate the magnesium in the aluminum-zinc-magnesium product from reacting with oxygen in the air;
(2) the corrosion inhibitor is added into the fingerprint-resistant coating to reduce the reaction speed of magnesium and oxygen in the air.
The conception, the specific structure, and the technical effects produced by the present invention will be further described below to fully understand the objects, the features, and the effects of the present invention.
Detailed Description
The following describes several preferred embodiments of the present invention to make the technical contents thereof clearer and easier to understand. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
According to the method for preparing the blackening-resistant aluminum-zinc-magnesium product, the surface of the hot-dip galvanized aluminum-magnesium product is coated with a high-density fingerprint-resistant coating (mainly comprising polyurethane resin), so that the coating is isolated from being directly contacted with air, magnesium in the coating is prevented from being contacted with oxygen in the air, and the surface of the material is not easy to generate blackening. Under the action of the surface treating agent, the hot-dip galvanized aluminum magnesium product is ensured not to be blackened within 6 months, and the aims are as follows: the color difference Δ E < 5. The key technology is that the fingerprint-resistant film formed by the surface treating agent (high molecular material) has very good compactness and can completely isolate the oxidation reaction between oxygen in the air and magnesium in the coating.
The high-density fingerprint-resistant coating (mainly comprising polyurethane resin) is coated on the surface of an aluminum-zinc-magnesium steel plate in a roller coating mode, the temperature of the coating after being taken out of an oven is 90-100 ℃ after infrared heating (the temperature in the oven is 300-350 ℃), so that the fingerprint-resistant agent is completely cured and uniformly covers the surface of the steel plate, and the thickness of the fingerprint-resistant film after being dried is 1.0-1.2 mu m.
Example 1
The embodiment provides a method for preparing an aluminum-zinc-magnesium product with blackening resistance, which comprises the following steps:
step 1, coating a fingerprint-resistant coating on the surface of a hot-dip aluminum-zinc-magnesium-plated steel plate at the temperature of 0-40 ℃ in a roller coating mode, wherein the fingerprint-resistant coating is a single-component water-based coating and comprises the following components in percentage by mass: 9-10% of polyurethane resin, 4-5% of silane, 0.5-1.5% of wax and the balance of water;
preferably, the fingerprint-resistant coating further comprises an antifoaming agent and a leveling agent which are not more than 1% by mass, so that foam is eliminated and leveling is promoted.
And 2, heating and drying the hot-dip aluminum-zinc-magnesium-plated steel plate coated with the wet film by using an infrared oven (the temperature in the oven is 300-350 ℃), wherein the infrared oven comprises a drying tunnel and is used for conveying the hot-dip aluminum-zinc-magnesium-plated steel plate coated with the wet film, the peak temperature of the metal processed by the drying tunnel is more than 100 ℃, preferably, the peak temperature of the metal processed by the drying tunnel is more than 110 ℃, when the steel plate leaves the infrared oven, the temperature of the steel plate is 90-100 ℃, and the fingerprint-resistant coating is completely cured to form a fingerprint-resistant film uniformly covering the surface of the steel plate, and the thickness of the fingerprint-resistant film is 1.0-1.2 mu m.
The embodiment is verified by a laboratory, and specifically comprises the following steps:
and (3) carrying out solarization experiments in a factory, placing the aluminum-zinc-magnesium product coated with the high-density environment-friendly fingerprint-resistant coating in an outdoor exposure field, comparing the color difference delta E value before and after the experiments after 6 months, and measuring that the delta E is 3.25.
Example 2
Similar to example 1, except that step 1 further comprises: and degreasing, cleaning and blow-drying the hot-dip aluminum-zinc-magnesium-plated steel plate before coating.
The metal surface must be free of oil, rust and other foreign matter prior to coating (degreasing and washing steps can be eliminated if the coil is coated directly after galvanization). After degreasing, thorough washing is necessary, and in order to avoid excessive contamination of the washing tank, the washing tank must be constantly flooded and replenished with fresh water. The web must be blow dried before the coating process can be performed.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A method of making a blackening resistant aluminium zinc magnesium product, the method comprising the steps of:
step 1, coating a fingerprint-resistant coating on the surface of a hot-dip aluminum-zinc-magnesium-plated steel plate, wherein the fingerprint-resistant coating is a single-component water-based coating and comprises the following components in percentage by mass: 9-10% of polyurethane resin, 4-5% of silane, 0.5-1.5% of wax and the balance of water;
and 2, heating and drying the hot-dip aluminum-zinc-magnesium-plated steel plate coated with the wet film by using an infrared oven to completely cure the fingerprint-resistant coating to form a fingerprint-resistant film uniformly covering the surface of the steel plate.
2. The method of making a blackening resistant aluminum zinc magnesium product of claim 1 wherein step 1 further comprises: and degreasing, cleaning and blow-drying the hot-dip aluminum-zinc-magnesium-plated steel plate before coating.
3. The method for preparing a blackening resistant Al-Zn-Mg product according to claim 1, wherein the coating in step 1 is performed by roll coating.
4. The method for preparing the blackening-resistant aluminum-zinc-magnesium product according to claim 1, wherein the coating in the step 1 is performed at a temperature of 0 to 40 ℃.
5. The method for preparing the blackening-resistant aluminum-zinc-magnesium product according to claim 1, wherein the furnace temperature of the infrared oven in the step 2 is 300-350 ℃.
6. The method for preparing a blackening-resistant AlZnMg product as set forth in claim 5, wherein the infrared oven in the step 2 comprises a drying tunnel for transferring the wet film-coated hot-dip aluminum-zinc-magnesium-plated steel sheet.
7. The method of making a blackening resistant aluminum zinc magnesium product of claim 6 wherein the tunnel treated metal peak temperature is above 100 ℃.
8. The method for preparing the blackening-resistant AlZnMg product as claimed in claim 7, wherein the step 2 comprises conveying the wet film-coated hot-dip AlZnMg steel plate through the drying tunnel of the infrared oven for heating, drying and curing, wherein the temperature of the steel plate is 90-100 ℃ when the steel plate leaves the infrared oven.
9. The method for preparing a blackening-resistant Al-Zn-Mg product according to claim 1, wherein the thickness of the fingerprint-resistant film formed on the surface of the steel sheet in the step 2 is 1.0 to 1.2 μm.
10. A product produced by the method for producing a blackening resistant al-zn-mg product according to any of claims 1 to 9, wherein the colour difference Δ Ε value of the surface of the product is less than 5 within 6 months.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111454047.1A CN114289281A (en) | 2021-12-02 | 2021-12-02 | Method for preparing anti-blackening aluminium-zinc-magnesium product and product prepared by method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111454047.1A CN114289281A (en) | 2021-12-02 | 2021-12-02 | Method for preparing anti-blackening aluminium-zinc-magnesium product and product prepared by method |
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|---|---|---|---|---|
| CN1511908A (en) * | 2002-12-26 | 2004-07-14 | 日本油漆株式会社 | Water resin composition for treating steel plate coated with aluminium-zinc alloy, its coating method and steel plate coated with aluminium-zinc alloy |
| CN106519953A (en) * | 2016-11-02 | 2017-03-22 | 烨辉（中国）科技材料有限公司 | Antibiosis fingerprint-proof surfacing steel product structure |
| JP2017066446A (en) * | 2015-09-29 | 2017-04-06 | Ｊｆｅスチール株式会社 | Surface-treatment galvanized steel plate excellent in corrosion resistance |
| CN107418328A (en) * | 2017-06-16 | 2017-12-01 | 上海兴赛尔表面材料有限公司 | A kind of special chromium-free fingerprint-resistant liquid of zinc-aluminum-magnesium clad steel sheet and preparation method thereof |
| CN110967338A (en) * | 2019-12-09 | 2020-04-07 | 烨辉（中国）科技材料有限公司 | Fingerprint-resistant involucra adhesion detection method for plated steel plate |
| CN112176329A (en) * | 2020-08-10 | 2021-01-05 | 唐山钢铁集团有限责任公司 | Surface passivator for zinc-aluminum-magnesium coating product and coating production method |
| WO2021060818A1 (en) * | 2019-09-24 | 2021-04-01 | 주식회사 포스코 | Ternary hot-dip galvannealed steel sheet surface treatment solution composition for providing excellent blackening resistance and alkali resistance, ternary hot-dip galvannealed steel sheet surface-treated using same, and manufacturing method therefor |
-
2021
- 2021-12-02 CN CN202111454047.1A patent/CN114289281A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1511908A (en) * | 2002-12-26 | 2004-07-14 | 日本油漆株式会社 | Water resin composition for treating steel plate coated with aluminium-zinc alloy, its coating method and steel plate coated with aluminium-zinc alloy |
| JP2017066446A (en) * | 2015-09-29 | 2017-04-06 | Ｊｆｅスチール株式会社 | Surface-treatment galvanized steel plate excellent in corrosion resistance |
| CN106519953A (en) * | 2016-11-02 | 2017-03-22 | 烨辉（中国）科技材料有限公司 | Antibiosis fingerprint-proof surfacing steel product structure |
| CN107418328A (en) * | 2017-06-16 | 2017-12-01 | 上海兴赛尔表面材料有限公司 | A kind of special chromium-free fingerprint-resistant liquid of zinc-aluminum-magnesium clad steel sheet and preparation method thereof |
| WO2021060818A1 (en) * | 2019-09-24 | 2021-04-01 | 주식회사 포스코 | Ternary hot-dip galvannealed steel sheet surface treatment solution composition for providing excellent blackening resistance and alkali resistance, ternary hot-dip galvannealed steel sheet surface-treated using same, and manufacturing method therefor |
| CN110967338A (en) * | 2019-12-09 | 2020-04-07 | 烨辉（中国）科技材料有限公司 | Fingerprint-resistant involucra adhesion detection method for plated steel plate |
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Application publication date: 20220408 |