CN112708877A - Chromium-free no-clean modified coating agent, aluminum material and surface coating treatment method thereof - Google Patents
Chromium-free no-clean modified coating agent, aluminum material and surface coating treatment method thereof Download PDFInfo
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- CN112708877A CN112708877A CN202011475917.9A CN202011475917A CN112708877A CN 112708877 A CN112708877 A CN 112708877A CN 202011475917 A CN202011475917 A CN 202011475917A CN 112708877 A CN112708877 A CN 112708877A
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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
- C23C22/34—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 fluorides or complex fluorides
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- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Chemical Treatment Of Metals (AREA)
Abstract
The invention relates to a chromium-free no-clean modified coating agent, an aluminum material and a surface coating treatment method thereof. The chromium-free no-clean modified coating agent is used for surface pretreatment of aluminum materials and comprises the following components in parts by weight in 1000 parts: 5-50 parts of organic silicon modified acrylate resin, 2-20 parts of fluozirconic acid, 2-10 parts of hydrofluoric acid, 2-10 parts of tartaric acid and the balance of water. The film formed by the chromium-free no-clean modified coating agent has good corrosion resistance and strong adhesive force, and is particularly suitable for being used as a coating treatment bottom layer. When the water-saving type aluminum material soaking and spraying device is applied to aluminum material treatment, the device can be used in a soaking and spraying mode without water washing, water is greatly saved, inconvenience caused by water use is avoided, and the device is very convenient to use. The coating agent does not contain chromium ions and other heavy metals which damage the environment, and is a green energy-saving and environment-friendly product.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a chromium-free wash-free modified coating agent, an aluminum material and a surface coating treatment method thereof.
Background
In order to improve the surface properties or appearance of the product, the surface of the workpiece is usually treated. For example, surface treatment processes for aluminum, iron, and alloys thereof are in great variety of industries. Furthermore, most of the works require pretreatment, such as cleaning, degreasing, and desmearing, before surface treatment, and some of the aluminum materials require surface coating.
The filming treatment generally adopts a filming agent to pretreat the aluminum material so as to form a film layer on the surface of the aluminum material, so that the subsequent surface treatment is carried out, and the bonding force and the corrosion resistance of the subsequent film are increased. The traditional leather membrane is generally cleaned by clear water after being treated or contains chromium ions, so that the environmental protection requirement and the process requirement of some merchants cannot be met.
Disclosure of Invention
In view of the above, a chromium-free no-clean modified coating agent with good corrosion resistance and strong binding force, a coating treatment method for the surface of an aluminum material and an aluminum material prepared by coating treatment are provided, the coating agent is environment-friendly and nontoxic, the process is simple and convenient, and no water washing is needed after coating.
A chromium-free no-clean modified coating agent is used for surface pretreatment of aluminum materials and comprises the following components in parts by weight in 1000 parts: 5-50 parts of organic silicon modified acrylate resin, 2-20 parts of fluozirconic acid, 2-10 parts of hydrofluoric acid, 2-10 parts of tartaric acid and the balance of water.
A method for processing the surface of an aluminum material into a film comprises the following steps: preparing the chromium-free no-clean modified coating agent; preparing a non-chrome washing-free modified coating agent into a coating solution with the mass percentage of 0.5-2%; controlling the pH value of the coating agent solution to be 2-5; and soaking or spraying the film solution on the surface of the aluminum material, and drying.
And an aluminum material having a surface film formed by the aluminum material surface film forming method.
The film formed by the chromium-free wash-free modified coating agent has good corrosion resistance, can be used as a coating treatment bottom layer, can be sprayed and soaked when used for treating aluminum products, does not need to be washed, greatly saves water, avoids inconvenience caused by water, and is very convenient to use. The coating agent does not contain chromium ions and other heavy metals which damage the environment, and is a green energy-saving and environment-friendly product.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The embodiment of the invention provides a chromium-free no-clean modified coating agent for surface pretreatment of aluminum materials, which comprises the following components in parts by weight in 1000 parts: 5-50 parts of organic silicon modified acrylate resin, 2-20 parts of fluozirconic acid, 2-10 parts of hydrofluoric acid, 2-10 parts of tartaric acid and the balance of water.
Specifically, the weight part of the silicone-modified acrylate resin is preferably 10 to 30 parts. The parts by weight of the fluorozirconic acid are preferably 5 to 10 parts. The weight portion of the hydrofluoric acid is preferably 2-6 portions. The weight portion of the tartaric acid is preferably 2-6 parts. The proportion of the coating agent is 0.5-2 wt%, and the PH value is preferably 2-5, and the coating agent is weakly acidic.
In the chromium-free no-clean modified coating agent, the ratio balance of the components is controlled to achieve a better film forming effect. For example, a coating film formed of a silicone-modified acrylate resin, which is mainly composed of a silicone-modified acrylate resin and fluorozirconic acid, has more excellent heat resistance and weather resistance, and is stabilized in PH by hydrofluoric acid, which promotes film formation.
The embodiment of the invention also provides a method for processing the surface of the aluminum material into a film, which comprises the following steps: preparing the chromium-free no-clean modified coating agent; preparing a non-chrome washing-free modified coating agent into a coating solution with the mass percentage of 0.5-2%; controlling the pH value of the coating agent solution to be 2-5; and soaking or spraying the film solution on the surface of the aluminum material, and drying.
Specifically, the mass percentage of the coating agent in the coating agent solution is preferably 0.5-2%, and the coating agent is sprayed or applied to the surface of the aluminum material during treatment, or an extrusion mode can be adopted. The treatment temperature is normal temperature, such as 20-25 deg.C. After the film is formed, the surface of the aluminum material is further subjected to passivation, oxidation resistance, or coating treatment. The drying temperature is controlled to be about 120 ℃, which is not too high, and the film layer is prevented from cracking.
An embodiment of the present invention also provides an aluminum material treated by the aluminum material surface film formation treatment method as described above, and a film is formed on the surface of the aluminum material. The film can protect the aluminum material and can be used as a coating treatment bottom layer for subsequent coating treatment and the like.
The following describes aspects of the chromium-free no-clean modified coating agent and the treatment method thereof according to the embodiment of the invention by specific examples.
Example 1
Mixing the following components in parts by weight: by 1000 parts by weight, 5 parts of organic silicon modified acrylate resin, 2 parts of fluozirconic acid, 2 parts of hydrofluoric acid, 2 parts of tartaric acid and the balance of water are stirred and mixed uniformly to prepare the coating agent.
The treatment method comprises the following steps: preparing a chromium-free wash-free modified coating agent; preparing a chrome-free washing-free modified coating agent into a coating solution with the mass percentage of 2%; controlling the pH value of the coating agent solution to be 3; at normal temperature, the aluminum material is soaked in the solution for 1 minute, taken out and placed under a fan to be drained, and then dried at 120 ℃.
After the treatment of the coating agent solution, the corrosion resistance of a workpiece is greatly improved, the neutral salt spray test is more than 48 hours, the workpiece is boiled in water for 2 hours after the paint coating, then the hundred-lattice test is carried out, the lattice dropping phenomenon is avoided, and the adhesive force is 0 grade.
Example 2
Mixing the following components in parts by weight: by weight of 1000 parts, 20 parts of organic silicon modified acrylate resin, 5 parts of fluozirconic acid, 4 parts of hydrofluoric acid, 4 parts of tartaric acid and the balance of water are stirred and mixed uniformly to prepare the coating agent.
The treatment method comprises the following steps: preparing a chromium-free wash-free modified coating agent; preparing a non-chrome washing-free modified coating agent into a coating solution with the mass percentage of 1.5%; controlling the pH value of the coating agent solution to be 3; at normal temperature, the aluminum material is soaked in the solution for 1 minute, taken out and placed under a fan to be drained, and then dried at 120 ℃.
After the treatment of the coating agent solution, the corrosion resistance of a workpiece is greatly improved, the neutral salt spray test is more than 48 hours, the workpiece is boiled in water for 2 hours after the paint coating, then the hundred-lattice test is carried out, the lattice dropping phenomenon is avoided, and the adhesive force is 0 grade.
Example 3
Mixing the following components in parts by weight: by weight of 1000 parts, 35 parts of organic silicon modified acrylate resin, 5 parts of fluozirconic acid, 6 parts of hydrofluoric acid, 6 parts of tartaric acid and the balance of water are stirred and mixed uniformly to prepare the coating agent.
The treatment method comprises the following steps: preparing a chromium-free wash-free modified coating agent; preparing a non-chrome washing-free modified coating agent into a coating solution with the mass percentage of 1%; controlling the pH value of the coating agent solution to be 3; at normal temperature, the aluminum material is soaked in the solution for 1 minute, taken out and placed under a fan to be drained, and then dried at 120 ℃.
After the treatment of the coating agent solution, the corrosion resistance of a workpiece is greatly improved, the neutral salt spray test is more than 48 hours, the workpiece is boiled in water for 2 hours after the paint coating, then the hundred-lattice test is carried out, the lattice dropping phenomenon is avoided, and the adhesive force is 0 grade.
Example 4
Mixing the following components in parts by weight: by 1000 parts by weight, 50 parts of organic silicon modified acrylate resin, 10 parts of fluozirconic acid, 6 parts of hydrofluoric acid, 6 parts of tartaric acid and the balance of water are stirred and mixed uniformly to prepare the coating agent.
The treatment method comprises the following steps: preparing a chromium-free wash-free modified coating agent; preparing a non-chrome washing-free modified coating agent into a coating solution with the mass percentage of 0.5%; controlling the pH value of the coating agent solution to be 3; at normal temperature, the aluminum material is soaked in the solution for 1 minute, taken out and placed under a fan to be drained, and then dried at 120 ℃.
After the treatment of the coating agent solution, the corrosion resistance of a workpiece is greatly improved, the neutral salt spray test is more than 48 hours, the workpiece is boiled in water for 2 hours after the paint coating, then the hundred-lattice test is carried out, the lattice dropping phenomenon is avoided, and the adhesive force is 0 grade.
It should be noted that the present invention is not limited to the above-mentioned embodiments, and other changes and modifications can be made by those skilled in the art according to the spirit of the present invention, and these changes and modifications made according to the spirit of the present invention should be included in the scope of the present invention as claimed.
Claims (10)
1. A chromium-free no-clean modified coating agent is used for surface pretreatment of aluminum materials, and is characterized by comprising the following components in parts by weight in 1000 parts: 5-50 parts of organic silicon modified acrylate resin, 2-20 parts of fluozirconic acid, 2-10 parts of hydrofluoric acid, 2-10 parts of tartaric acid and the balance of water.
2. The chromium-free no-clean modified film coating agent of claim 1, wherein the weight portion of the organosilicon modified acrylate resin is 10-30.
3. The chromium-free no-clean modified coating agent of claim 1, wherein the weight portion of the fluozirconic acid is 5 to 10 portions.
4. The chromium-free no-clean modified coating agent of claim 1, wherein the weight portion of the hydrofluoric acid is 2-6.
5. The chromium-free no-clean modified film agent of claim 1, wherein the weight portion of tartaric acid is 2-6 portions.
6. The chromium-free no-clean modified coating agent of claim 1, wherein the coating agent is used in a ratio of 0.5-2 wt%.
7. The chromium-free leave-on modified coating agent of claim 1, wherein the PH of said coating agent is from 2 to 5.
8. A method for processing the surface of an aluminum material into a film comprises the following steps: preparing a chromium-free leave-on modified coating agent according to any one of claims 1 to 7; preparing a non-chrome washing-free modified coating agent into a coating solution with the mass percentage of 0.5-2%; controlling the pH value of the coating agent solution to be 2-5; soaking the surface of the aluminum material, spraying a film solution, draining as soon as possible and then drying.
9. An aluminum material characterized in that a coating film is formed on the surface of the aluminum material by the aluminum material surface coating treatment method according to claim 8.
10. An aluminum material as defined in claim 9 wherein after the coating film is formed, the surface of the aluminum material is further subjected to a passivation, oxidation resistance or coating treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011475917.9A CN112708877A (en) | 2020-12-14 | 2020-12-14 | Chromium-free no-clean modified coating agent, aluminum material and surface coating treatment method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011475917.9A CN112708877A (en) | 2020-12-14 | 2020-12-14 | Chromium-free no-clean modified coating agent, aluminum material and surface coating treatment method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112708877A true CN112708877A (en) | 2021-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011475917.9A Withdrawn CN112708877A (en) | 2020-12-14 | 2020-12-14 | Chromium-free no-clean modified coating agent, aluminum material and surface coating treatment method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112708877A (en) |
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2020
- 2020-12-14 CN CN202011475917.9A patent/CN112708877A/en not_active Withdrawn
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Application publication date: 20210427 |