CN112522652A - Plating assistant agent for hot dip plating of zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium rare earth alloy - Google Patents
Plating assistant agent for hot dip plating of zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium rare earth alloy Download PDFInfo
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- CN112522652A CN112522652A CN202011416984.3A CN202011416984A CN112522652A CN 112522652 A CN112522652 A CN 112522652A CN 202011416984 A CN202011416984 A CN 202011416984A CN 112522652 A CN112522652 A CN 112522652A
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- plating
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- assistant agent
- hot dip
- alloy
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
Abstract
The invention discloses a plating assistant agent for hot dip plating of zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium rare earth alloy, which comprises the following components in percentage by mass: 0.2-1% of potassium fluoroaluminate, 1.8-5% of KF and ZnCl2 30‑40％，CaCl2 0.5‑2%，H2O2 3-5%, citric acid 1-5%, alcohol 2-5% and the balance of water. The plating assistant agent has less zinc slag during hot dip plating of steel plates, effectively avoids plating leakage, and obtains a plating layer with moderate thickness, good adhesive force, smooth surface and good protection effect on a matrix. The plating assistant agent can be suitable for various different alloys, can obtain the plating assistant agent with good effect only by properly adjusting the proportion of various components, and has greater popularization and application potential.
Description
Technical Field
The invention belongs to the field of hot dip coating of steel surfaces, and particularly relates to a plating assistant agent for hot dip coating of zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium rare earth alloy.
Background
The zinc coating can not only play a physical protection role for the matrix, but also play an electrochemical cathodic protection role, can obviously improve the corrosion resistance of the steel material, and is one of the technologies commonly applied to the corrosion protection of the steel at present. The pretreatment of steel with a plating assistant agent before hot dip plating is a necessary process of hot dip plating. The uniformity and quality of the plating layer are directly determined by the plating assisting effect, and the protection effect of the plating layer on a matrix is further influenced.
The hot dip plating process flow comprises the following steps: alkali washing oil → water washing → acid washing rust removal → water washing → plating assistant agent dipping and sticking → drying → hot dipping alloy → cooling. The plating assistant agent can prevent the steel after oil and rust removal from being oxidized and rusted in the air before being immersed in the alloy liquid, and can also play a role in activating the surface of a steel substrate, thereby obviously improving the hot dipping effect and the quality of a plating layer.
After the original environment-friendly plating assistant agent is used for plating, the temperature of hot dip zinc-aluminum-magnesium alloy is higher than that of hot dip galvanizing (445 ℃ -455 ℃), so that the crucible is easy to crack due to high temperature, the service life of the crucible is shortened, and the hot dip zinc-aluminum-magnesium alloy can not be popularized in practical application on a large scale. And the application alloy range of the original plating assistant agent is smaller, different alloys need different plating assistant agents, and certain inconvenience is caused in the popularization of practical application.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a plating assistant for hot dip plating of zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium-rare earth alloy. The plating assistant agent is green and environment-friendly, is suitable for plating assistant zinc-aluminum-magnesium alloy and zinc-aluminum-magnesium rare earth alloy, and can obtain a zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium rare earth alloy plating layer with uniformity, high finish degree and no plating leakage after plating.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a plating assistant agent for hot dip plating of zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium rare earth alloy comprises the following components in percentage by mass: 0.2-1% of potassium fluoroaluminate, 1.8-5% of KF and ZnCl230-40％，CaCl2 0.5-2%，H2O23-5%, citric acid 1-5%, alcohol 2-5% and the balance of water.
The plating assistant agent used in the method does not add ammonium chloride, so that no smoke is generated during hot dip plating. 0.2 to 1 percent of potassium fluoroaluminate can dissolve alumina on the surface of the zinc liquid, and can form a protective layer on the surface of the zinc liquid to cover the surface of the zinc liquid and prevent the zinc liquid from being oxidized again.
1.8-5% of potassium fluoride, has good solubility in acid solution, can form a compact film layer on the surface of a steel plate matrix, and prevents the matrix from being oxidized again; the addition of the potassium fluoride can improve the activity of the surface of the matrix, reduce the surface tension of the alloy liquid and improve the wettability of the alloy liquid to the matrix. Stripping the oxide scale on the surface of the steel, surrounding the stripped oxide scale, discharging the oxide scale to the surface of the flux, and simultaneously generating interface activation on the surface of the steel;
30-40% of zinc chloride, and ZnCl which can form zinc chloride hydrate with water2·2H2And O can dissolve oxides on the surface of the workpiece, purify the surface of the steel plate, improve the hot dipping effect and avoid the phenomenon of plating leakage. And the zinc chloride is very stable at high temperature, and can form a crystalline salt film on the surface of the workpiece to cover the surface of the workpiece, so that the workpiece is protected from reoxidation.
0.2-2% of calcium chloride, can reduce the tension of the joint surface of the molten pool and the substrate, enhance the infiltration capacity of the molten pool to steel and iron, and enhance the reaction activity of the substrate and the molten pool;
H2O 23-5%, which can oxidize ferrous ions on the surface of the steel plate into ferric ions, thereby being beneficial to forming an alloy coating.
1-5% of citric acid can be used for regulating pH value and can be used as surfactant to improve the quality of the coating.
2-5% of ethanol, and can accelerate the volatilization of the solvent on the surface of the workpiece after plating assistance, so that the workpiece can be quickly dried.
A plating assistant agent for hot dip plating of a Zn-5Al-1Mg alloy coating comprises the following components in percentage by mass: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
A plating assistant agent for hot dip plating of a Zn-5Al-1.5Mg alloy coating comprises the following components in percentage by mass: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
A plating assistant agent for hot dip plating of a Zn-5Al-2Mg alloy coating comprises the following components in percentage by mass: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
A plating assistant agent for hot dip plating of a Zn-5Al-2Mg-0.1RE alloy plating layer comprises the following components in percentage by mass: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
A plating assistant agent for hot dip plating of a Zn-6Al-3Mg alloy coating comprises the following components in percentage by mass: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
A plating assistant agent for hot dip plating of a Zn-6Al-3Mg-0.1RE alloy plating layer comprises the following components in percentage by mass: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
The plating assistant agent is applied to the hot dip plating pretreatment of the workpiece.
The method for carrying out hot dip coating pretreatment on the workpiece by using the plating assistant agent comprises the following steps:
heating the plating assistant agent to 75-85 ℃, immersing the workpiece subjected to acid cleaning and alkali cleaning into the plating assistant agent for 40-100s, and then drying the steel workpiece.
Preferably, the time for soaking the workpiece in the plating assistant agent is 95-105 s.
Preferably, the drying temperature is 100-.
A workpiece is prepared by hot dip coating of zinc-magnesium-aluminum alloy or zinc-magnesium-aluminum-rare earth alloy after pretreatment of the plating assistant agent.
The invention has the beneficial effects that:
when the steel plate is hot dipped and plated by the plating assistant agent, the plating assistant agent on the surface of the sample is less, so that the generation amount of zinc dross is reduced, and the plating leakage phenomenon caused by the conventional plating assistant agent can be avoided, so that a plating layer with moderate thickness, good adhesive force, smooth surface and good protection effect on a matrix can be obtained.
The plating assistant agent can be suitable for various different alloys, can obtain the plating assistant agent with good effect only by properly adjusting the proportion of various components, and has greater popularization and application potential.
The steel plate treated by the plating assistant agent can realize hot dip plating of zinc-aluminum-magnesium alloy at about 450 ℃, solves the technical problem that a crucible is easy to crack at high temperature in the traditional hot dip plating of zinc-aluminum-magnesium alloy, prolongs the service life of the crucible, and can be popularized and applied on a large scale.
Detailed Description
The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.
Example 1
The hot dip coating Zn-5Al-1Mg alloy contains potassium fluoroaluminate 1%, KF 5% and ZnCl as plating assistant2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
After pretreatment of alkali washing oil removal and acid washing rust removal, a 40mm x 40mm steel plate is immersed in a plating assistant agent under the condition of 80 ℃ water bath for assistant plating for 45 seconds, and the surface of the steel plate after assistant plating has slight purplish red color, and then is put into a 120 ℃ oven for drying. Hot dipping in alloy liquid at 455 ℃ for 60 seconds, throwing off excessive alloy liquid, and naturally cooling at room temperature. The hot dip coating is free from smog, the surface of the steel plate has no plating leakage phenomenon, and the coating is smooth, bright and good in adhesiveness. The thickness of the plating layer is 105-120 μm.
Example 2
Hot dip coating Zn-5Al-1.5Mg alloy, wherein the plating assistant agent comprises the following components: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
After pretreatment of alkali washing oil removal and acid washing rust removal, a 40mm x 40mm steel plate is immersed in a plating assistant agent under the condition of 80 ℃ water bath for assistant plating for 45 seconds, and the surface of the steel plate after assistant plating has slight purplish red color, and then is put into a 120 ℃ oven for drying. And (3) carrying out hot dip coating in the alloy liquid at 450 ℃ for 60 seconds, throwing off the excessive alloy liquid, and naturally cooling at room temperature. The hot dip coating is free from smog, the surface of the steel plate has no plating leakage phenomenon, the coating is relatively flat, the surface is bright, the adhesiveness is relatively good, and the thickness of the coating is 98-110 mu m.
Example 3
The hot dip coating Zn-5Al-2Mg alloy comprises the following plating assistant agents: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
After pretreatment of alkali washing oil removal and acid washing rust removal, a 40mm x 40mm steel plate is immersed in a plating assistant agent under the condition of 80 ℃ water bath for assistant plating for 45 seconds, and the surface of the steel plate after assistant plating has slight purplish red color, and then is put into a 120 ℃ oven for drying. And (3) carrying out hot dip coating in the alloy liquid at 450 ℃ for 60 seconds, throwing off the excessive alloy liquid, and naturally cooling at room temperature. The hot dip coating is free from smog, the surface of the steel plate has no plating leakage phenomenon, the coating is relatively flat, the surface is bright, the adhesiveness is relatively good, and the thickness of the coating is 90-103 mu m.
Example 4
Hot dip coating Zn-5Al-2Mg-0.1RE alloy, wherein the plating assistant agent comprises the following components: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
After pretreatment of alkali washing oil removal and acid washing rust removal, a 40mm x 40mm steel plate is immersed in a plating assistant agent under the condition of 80 ℃ water bath for assistant plating for 45 seconds, and the surface of the steel plate after assistant plating has slight purplish red color, and then is put into a 120 ℃ oven for drying. And (3) carrying out hot dip coating in the alloy liquid at 450 ℃ for 60 seconds, throwing off the excessive alloy liquid, and naturally cooling at room temperature. The hot dip coating is free from smog, the surface of the steel plate has no plating leakage phenomenon, the coating is smooth, the surface is bright, the adhesiveness is good, and the thickness of the coating is 95-108 mu m.
Example 5
The hot dip coating Zn-6Al-3Mg alloy comprises the following plating assistant agents: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
After pretreatment of alkali washing oil removal and acid washing rust removal, a 40mm x 40mm steel plate is immersed in a plating assistant agent under the condition of 80 ℃ water bath for assistant plating for 45 seconds, and the surface of the steel plate after assistant plating has slight purplish red color, and then is put into a 120 ℃ oven for drying. And (3) carrying out hot dip coating in the alloy liquid at the temperature of 445 ℃ for 60 seconds, throwing off the excessive alloy liquid, and naturally cooling at room temperature. The hot dip coating is free from smoke generation, the surface of the steel plate has no plating leakage phenomenon, the coating is smooth, the surface is bright, the adhesiveness is good, and the thickness of the coating is 100-110 mu m.
Example 6
Hot dip coating Zn-6Al-3Mg-0.1RE alloy, wherein the plating assistant agent comprises the following components: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
After pretreatment of alkali washing oil removal and acid washing rust removal, a 40mm x 40mm steel plate is immersed in a plating assistant agent under the condition of 80 ℃ water bath for assistant plating for 45 seconds, and the surface of the steel plate after assistant plating has slight purplish red color, and then is put into a 120 ℃ oven for drying. And (3) carrying out hot dip coating in the alloy liquid at the temperature of 445 ℃ for 60 seconds, throwing off the excessive alloy liquid, and naturally cooling at room temperature. The hot dip coating is free from smog, the surface of the steel plate has no plating leakage phenomenon, the coating is smooth, the surface is bright, the adhesiveness is good, and the thickness of the coating is 92-108 mu m.
Claims (7)
1. The plating assistant agent for hot dip plating of zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium-rare earth alloy is characterized by comprising the following components in percentage by mass: 0.2-1% of potassium fluoroaluminate, 1.8-5% of KF and ZnCl230-40％，CaCl2 0.5-2%，H2O23-5%, citric acid 1-5%, alcohol 2-5% and the balance of water.
2. The plating assistant agent for hot dip plating of the Zn-5Al-1Mg alloy coating is characterized by comprising the following components in percentage by massThe components of the content are as follows: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
3. The plating assistant agent for hot dip plating of the Zn-5Al-1.5Mg alloy coating is characterized by comprising the following components in percentage by mass: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
4. The plating assistant agent for the hot dip plating of the Zn-5Al-2Mg alloy coating is characterized by comprising the following components in percentage by mass: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
5. The plating assistant agent for the hot dip plating of the Zn-5Al-2Mg-0.1RE alloy plating layer is characterized by comprising the following components in percentage by mass: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
6. The plating assistant agent for the hot dip plating of the Zn-6Al-3Mg alloy coating is characterized by comprising the following components in percentage by mass: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
7. The plating assistant agent for the hot dip plating of the Zn-6Al-3Mg-0.1RE alloy plating layer is characterized by comprising the following components in percentage by mass: 1% of potassium fluoroaluminate, 5% of KF and ZnCl2 35％，CaCl2 2%，H2O2 4%, citric acid 1%, alcohol 3% and the balance of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011416984.3A CN112522652A (en) | 2020-12-07 | 2020-12-07 | Plating assistant agent for hot dip plating of zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium rare earth alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011416984.3A CN112522652A (en) | 2020-12-07 | 2020-12-07 | Plating assistant agent for hot dip plating of zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium rare earth alloy |
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| CN112522652A true CN112522652A (en) | 2021-03-19 |
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| CN202011416984.3A Pending CN112522652A (en) | 2020-12-07 | 2020-12-07 | Plating assistant agent for hot dip plating of zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium rare earth alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354255A (en) * | 2022-07-12 | 2022-11-18 | 江苏甬金金属科技有限公司 | Stainless steel strip with hot-dip galvanized aluminum alloy coating and preparation method thereof |
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| CN105648377A (en) * | 2016-01-21 | 2016-06-08 | 国网山东省电力公司电力科学研究院 | Long-ageing reusable plating assistant agent for zinc-aluminum-magnesium alloy for hot dipping |
| CN106399889A (en) * | 2016-11-29 | 2017-02-15 | 国网山东省电力公司电力科学研究院 | Plating adjuvant for hot dipping of zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium rare earth alloy |
| CN107740022A (en) * | 2017-11-06 | 2018-02-27 | 国网山东省电力公司电力科学研究院 | A kind of hot-dip aluminum zinc magnesium alloy fluxing agent |
| WO2018040536A1 (en) * | 2016-08-30 | 2018-03-08 | 龙南县格林庭园用品有限公司 | Method for preparing composite hot-galvanized steel wire |
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2020
- 2020-12-07 CN CN202011416984.3A patent/CN112522652A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105648377A (en) * | 2016-01-21 | 2016-06-08 | 国网山东省电力公司电力科学研究院 | Long-ageing reusable plating assistant agent for zinc-aluminum-magnesium alloy for hot dipping |
| WO2018040536A1 (en) * | 2016-08-30 | 2018-03-08 | 龙南县格林庭园用品有限公司 | Method for preparing composite hot-galvanized steel wire |
| CN106399889A (en) * | 2016-11-29 | 2017-02-15 | 国网山东省电力公司电力科学研究院 | Plating adjuvant for hot dipping of zinc-aluminum-magnesium alloy or zinc-aluminum-magnesium rare earth alloy |
| CN107740022A (en) * | 2017-11-06 | 2018-02-27 | 国网山东省电力公司电力科学研究院 | A kind of hot-dip aluminum zinc magnesium alloy fluxing agent |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354255A (en) * | 2022-07-12 | 2022-11-18 | 江苏甬金金属科技有限公司 | Stainless steel strip with hot-dip galvanized aluminum alloy coating and preparation method thereof |
| CN115354255B (en) * | 2022-07-12 | 2024-02-02 | 江苏甬金金属科技有限公司 | Stainless steel strip with hot-dip zinc-aluminum alloy coating and preparation method thereof |
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Application publication date: 20210319 |