CN112725779A - Chromium-free silicon-free washing coating agent, aluminum material and surface coating treatment method thereof - Google Patents

Chromium-free silicon-free washing coating agent, aluminum material and surface coating treatment method thereof Download PDF

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Publication number
CN112725779A
CN112725779A CN202011475886.7A CN202011475886A CN112725779A CN 112725779 A CN112725779 A CN 112725779A CN 202011475886 A CN202011475886 A CN 202011475886A CN 112725779 A CN112725779 A CN 112725779A
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China
Prior art keywords
free
parts
chromium
coating agent
aluminum material
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Application number
CN202011475886.7A
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Chinese (zh)
Inventor
方招娣
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Shenzhen Mayor Hongtai Technology Co ltd
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Shenzhen Mayor Hongtai Technology Co ltd
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Priority to CN202011475886.7A priority Critical patent/CN112725779A/en
Publication of CN112725779A publication Critical patent/CN112725779A/en
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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
    • 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
    • C23C22/73—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 characterised by the process
    • 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
    • C23C22/73—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 characterised by the process
    • C23C22/76—Applying the liquid by spraying

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  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

The invention relates to a chromium-free silicon-free coating agent, an aluminum material and a surface coating treatment method thereof. The chromium-free silicon-free washing 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 methyl silicone resin, 2-20 parts of fluozirconic acid, 2-10 parts of hydrofluoric acid, 2-10 parts of glacial acetic acid and the balance of water. The film formed by the chromium-free silicon-free washing film agent has good corrosion resistance, is particularly suitable for being used as a coating treatment bottom layer, and has good adhesive force. When the aluminum material is treated, the coating agent can be used in a soaking and spraying mode, water washing is not needed, water and resources are saved, the operation is very convenient, and the coating agent does not contain chromium ions and other heavy metals which damage the environment, so that the coating agent is a green, energy-saving and environment-friendly product.

Description

Chromium-free silicon-free washing coating agent, aluminum material and surface coating treatment method thereof
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a chromium-free silicon-free washing film agent, an aluminum material and a surface film 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 and silicon-free coating agent with good corrosion resistance and strong binding force is provided, and a coating treatment method for the surface of an aluminum material and an aluminum material prepared by coating treatment are provided.
A chromium-free silicon-free washing 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 methyl silicone resin, 2-20 parts of fluozirconic acid, 2-10 parts of hydrofluoric acid, 2-10 parts of glacial acetic acid and the balance of water.
Preferably, the weight part of the methyl silicone resin is 10-30 parts.
Preferably, the parts by weight of the fluorozirconic acid are 5 to 10 parts.
Preferably, the weight part of the hydrofluoric acid is 2-6 parts.
Preferably, the glacial acetic acid is 2-6 parts by weight.
Preferably, the use ratio of the coating agent is 0.5-2 wt%.
Preferably, the pH value of the coating agent is 2-5.
A method for processing the surface of an aluminum material into a film comprises the following steps: preparing the chromium-free silicon-free washing film agent; preparing a non-chromium silicon-free film-washing agent into a film 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.
Further, after the film is formed, the surface of the aluminum material is further subjected to passivation, oxidation resistance, or coating treatment.
The film formed by the chromium-free silicon-free washing-free film agent has good corrosion resistance and strong adhesive force, 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, saves a large amount of water, is simple in subsequent sewage treatment, is very convenient to operate in the whole treatment process, 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 silicon-free coating agent for surface pretreatment of aluminum materials, which comprises the following components in parts by weight in 1000 parts by weight: 5-50 parts of methyl silicone resin, 2-20 parts of fluozirconic acid, 2-10 parts of hydrofluoric acid, 2-10 parts of glacial acetic acid and the balance of water.
Specifically, the weight part of the methyl silicone 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 glacial acetic 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 silicon-free coating agent, a better film forming effect is achieved by controlling the proportion balance of the components. For example, methyl silicone resin and fluorozirconic acid are main components of the film layer, and the high SiO peculiar to methyl silicone resin is fully utilized2The content characteristic is favorable for enhancing the rigidity of the formed film. Hydrofluoric acid promotes the film formation and glacial acetic acid stabilizes the pH of the bath solution.
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 silicon-free washing film agent; preparing a non-chromium silicon-free film-washing agent into a film 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 aspects of the chromium-free silicon-free washing film agent, the treatment method and the like of the embodiment of the invention are illustrated by specific examples.
Example 1
Mixing the following components in parts by weight: by weight of 1000 parts, 5 parts of methyl silicone resin, 2 parts of fluorozirconic acid, 2 parts of hydrofluoric acid, 2 parts of glacial acetic acid and the balance of water are stirred and uniformly mixed to prepare the coating agent.
The treatment method comprises the following steps: preparing a chromium-free silicon-free coating agent; preparing a non-chromium silicon-based washing-free film agent into a film 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 methyl silicone resin, 5 parts of fluorozirconic acid, 4 parts of hydrofluoric acid, 4 parts of glacial acetic acid and the balance of water are stirred and uniformly mixed to prepare the coating agent.
The treatment method comprises the following steps: preparing a chromium-free silicon-free coating agent; preparing a non-chromium silicon-based washing-free film agent into a film 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 methyl silicone resin, 5 parts of fluorozirconic acid, 6 parts of hydrofluoric acid, 6 parts of glacial acetic acid and the balance of water are stirred and uniformly mixed to prepare the coating agent.
The treatment method comprises the following steps: preparing a chromium-free silicon-free coating agent; preparing a non-chromium silicon-based washing-free film agent into a film 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 weight of 1000 parts, 50 parts of methyl silicone resin, 10 parts of fluorozirconic acid, 6 parts of hydrofluoric acid, 6 parts of glacial acetic acid and the balance of water are stirred and uniformly mixed to prepare the coating agent.
The treatment method comprises the following steps: preparing a chromium-free silicon-free coating agent; preparing a non-chromium silicon-based washing-free film agent into a film 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 silicon-free coating agent for surface pretreatment of aluminum materials is characterized by comprising the following components in parts by weight in 1000 parts: 5-50 parts of methyl silicone resin, 2-20 parts of fluozirconic acid, 2-10 parts of hydrofluoric acid, 2-10 parts of glacial acetic acid and the balance of water.
2. The chromium-free silicon-free film cleaning agent as defined in claim 1, wherein the methyl silicone resin is 10-30 parts by weight.
3. The chromium-free silicon-free film cleaning agent as defined in claim 1, wherein the fluozirconic acid is 5-10 parts by weight.
4. The chromium-free silicon-free film cleaning agent as defined in claim 1, wherein the hydrofluoric acid is 2-6 parts by weight.
5. The chromium-free silicon-free film cleaning agent as defined in claim 1, wherein the glacial acetic acid is 2-6 parts by weight.
6. The chromium-free silicon-free washing and coating agent of claim 1, wherein the coating agent is used in a ratio of 0.5-2 wt%.
7. The chromium-free silicon-free laundry coating agent of claim 1, wherein the PH of the coating agent is 2-5.
8. A method for processing the surface of an aluminum material into a film comprises the following steps: preparing a chromium-free silicon-based film cleaning agent as defined in any one of claims 1-7; preparing a non-chromium silicon-free film-washing agent into a film 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.
CN202011475886.7A 2020-12-14 2020-12-14 Chromium-free silicon-free washing coating agent, aluminum material and surface coating treatment method thereof Withdrawn CN112725779A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011475886.7A CN112725779A (en) 2020-12-14 2020-12-14 Chromium-free silicon-free washing coating agent, aluminum material and surface coating treatment method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011475886.7A CN112725779A (en) 2020-12-14 2020-12-14 Chromium-free silicon-free washing coating agent, aluminum material and surface coating treatment method thereof

Publications (1)

Publication Number Publication Date
CN112725779A true CN112725779A (en) 2021-04-30

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Application publication date: 20210430