CN110809634A - Passivating agent, metal workpiece and surface passivation method thereof - Google Patents
Passivating agent, metal workpiece and surface passivation method thereof Download PDFInfo
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- CN110809634A CN110809634A CN201780092837.5A CN201780092837A CN110809634A CN 110809634 A CN110809634 A CN 110809634A CN 201780092837 A CN201780092837 A CN 201780092837A CN 110809634 A CN110809634 A CN 110809634A
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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
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- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
A passivator, a metal workpiece and a surface passivation method thereof are disclosed, wherein the passivator comprises the following components in parts by weight: 1-5 parts of chromium trichloride, 5-30 parts of acidic silica sol, 2-6 parts of gamma-aminopropyltriethoxysilane, 0.5-3 parts of citric acid and the balance of distilled water. The passivated galvanized sheet forms a colorless firm protective film on the surface of the plating layer, the performances of corrosion resistance, oxidation resistance, vulcanization blackening resistance and the like are greatly enhanced, and the passivated galvanized sheet can be widely applied to various metal plated pieces, and is particularly better for passivating the galvanized layer.
Description
Passivator, metal workpiece and surface passivation method thereof
[0001] The invention relates to the technical field of surface treatment, in particular to a passivating agent, a metal workpiece surface passivating method and a metal workpiece.
Background
[0002] In order to improve the surface properties or appearance of the product, the surface of the workpiece is usually treated. For example, surface treatment methods for steel and its plated parts, copper and its plated parts are in great progress in various industries. Passivation is a common surface treatment method.
[0003] The traditional passivation method comprises a boiling water method, a metal salt method and the like, and although the boiling water passivation method is pollution-free, the powder frost phenomenon is easy to occur, the quality appearance and the binding force between a paint layer and a substrate are influenced, and the energy consumption is large. The metal salt method has various ions, and some impurity ions exist, and have certain interference on passivation treatment. And the protective layer generated after the treatment of the passivation agent is not compact, does not resist temperature and has poor corrosion resistance.
Technical problem
[0004] In view of the above, a passivator with strong bonding force, temperature resistance and corrosion resistance, a metal workpiece surface passivation method and a metal workpiece are provided.
Solution to the problem
Technical solution
[0005] The passivator comprises the following components in parts by weight, wherein the passivator comprises the following components in parts by weight: 1-5 parts of chromium trichloride, 5-30 parts of acidic silica sol, 2-6 parts of gamma-aminopropyltriethoxysilane, 0.5-3 parts of citric acid and the balance of distilled water.
[0006] A method for passivating the surface of a metal workpiece, wherein the surface of the metal workpiece is provided with a metal coating, comprises the following steps: preparing the passivator as described above, and treating the metal plated part with the passivator, wherein the value of Ρ Η of the solution is controlled to be in the range of 3.0-6.0, and after the treatment for a predetermined time interval, a passivation protective film is formed on the surface of the metal plated part.
[0007] And a metal workpiece having a metal plating film on a surface thereof, the metal plating film having a passivation film formed thereon according to the metal workpiece surface passivation method as described above.
Advantageous effects of the invention
[0008] The protective film layer formed by the passivating agent has strong passivation property, oxidation resistance, vulcanization blackening resistance and other properties on metal and a plating layer, a colorless firm protective film is formed on the surface of the plating layer after drying, the corrosion resistance, oxidation resistance, vulcanization blackening resistance and other properties are greatly enhanced, and the protective film layer can be widely applied to various metal plating pieces, is particularly better for passivation of a zinc plating layer, and is a better choice for corrosion resistance and discoloration resistance on the surface of the plating layer. The process of the treatment method is easy to operate, and the treatment method can be used for dip coating and spray brushing. The passivating agent is a water-soluble anticorrosion passivating substance. The product is nontoxic, non-inflammable, and convenient for use. The protective film formed after treatment is insoluble in water, has good sulfuration resistance and moisture resistance, good toughness of the film layer and can be bent and deformed. After the passivation treatment of the passivator, the surface gloss and hardness of the passivated metal plated part are improved, and the passivator can be widely applied to various metal plated parts.
Modes for carrying out the invention
[0009] The present invention will be described in detail with reference to specific examples.
[0010] The embodiment of the invention provides a passivating agent, which comprises the following components in parts by weight in 1000 parts: 1-5 parts of chromium trichloride, 5-30 parts of acidic silica sol, 2-6 parts of gamma-aminopropyltriethoxysilane, 0.5-3 parts of citric acid and the balance of distilled water.
[0011] Preferably, the weight portion of the chromium trichloride is 2-4 portions. The weight portion of the acidic silica sol is preferably 10-2
0 part of (A). The weight part of the gamma-aminopropyltriethoxysilane is preferably 3-5 parts. The weight portion of the citric acid is preferably
1-2 parts.
[0012] The value of passivating agent was controlled in the range of 3.0-6.0 using a value of inch Ρ Η. In the passivating agent, chromium trichloride is a main component of a passivating film, and acidic silica sol and gamma-aminopropyltriethoxysilane are filled and covered. Citric acid can promote uniform generation of a passivation film.
[0013] The embodiment of the invention also provides a method for passivating the surface of a metal workpiece, wherein the surface of the metal workpiece is provided with a metal coating, preferably a zinc coating, and the method comprises the following steps: preparing the passivator, treating a metal plated part by using a passivator solution, controlling a value of PH of the solution within a range of 3.0-6.0, forming a passivation protective film on the surface of the metal plated part after treating for a preset time, and drying or naturally drying.
[0014] The metal plating part is treated by the passivating agent solution by a dipping method, a spraying method or a brushing method, and the dipping method is preferred. During the treatment of the passivating agent solution, the control temperature is preferably 20-40 ℃, and the treatment time is preferably 4-8 minutes. [0015] In addition, the embodiment of the invention also provides a metal workpiece, wherein the surface of the metal workpiece is provided with a metal coating, such as a coating formed by metal electroplating and chemical plating. The metal plating film is formed with a passivation film according to the method for passivating the surface of the metal workpiece as described above.
[0016] The processing object of the metal plated part can be but is not limited to a galvanized part, after the surface processing, the surface of the metal workpiece has good protection effect, the formed protective film has strong passivation property, oxidation resistance, vulcanization blackening resistance and other properties on metal and a plating layer, a colorless and transparent firm protective film is formed on the surface of the plating layer after drying, the corrosion resistance, the oxidation resistance, the vulcanization blackening resistance and other properties are greatly enhanced, and the method is the best choice for corrosion resistance and discoloration prevention of the surface of the plating layer. The treatment method has simple process and easy operation, and can be used for dip coating and spray coating. The passivation agent is a water-soluble corrosion-resistant passivation substance. The product is nontoxic, non-inflammable, no environmental pollution, and convenient for use. The protective film formed after treatment is insoluble in water, has good sulfuration resistance and moisture resistance, good toughness of the film layer and can be bent and deformed. Besides being applied to metal workpieces, the passivating agent can also be widely applied to decorative coatings and anti-corrosion coatings of products such as hardware machinery, communication equipment, instruments, household appliances, lamps and the like.
[0017] The composition range, preparation method and usage effect of the passivator are illustrated by the following examples, and the metal workpieces in the following examples are all galvanized workpieces.
[0018] Example 1
[0019] The passivator comprises the following components in parts by weight (calculated by 1000 total weight parts): 1 part of chromium trichloride, 5 parts of acidic silica sol, 2 parts of gamma-aminopropyltriethoxysilane, 0.5 part of citric acid and the balance of distilled water are stirred and uniformly mixed to prepare the passivating agent.
[0020] The passivation treatment method comprises the following steps: after a metal workpiece is coated, a metal plated part is immersed in a passivating agent solution, the value of p Η of the passivating agent solution is controlled to be 3.0 by phosphoric acid or sodium hydroxide, the temperature is 30 ℃, after 8 minutes of treatment, a passivation protective film is formed on the surface of the metal plated part, and the metal plated part is taken out and dried for 15 minutes at the temperature of 80 ℃.
[0021] The treated metal plating piece has bright appearance surface, uniform color, no abnormal phenomena such as pitting corrosion, spot mark and the like, and the neutral salt spray test is over 24 inches.
[0022] Example 2
[0023] The passivator comprises the following components in parts by weight (calculated by 1000 total weight parts): 2 parts of chromium trichloride, 15 parts of acidic silica sol, 3 parts of gamma-aminopropyl triethoxy silane, 1.5 parts of citric acid and the balance of distilled water are stirred and uniformly mixed to prepare a passivating agent.
[0024] The passivation treatment method comprises the following steps: after a metal workpiece is coated, the metal workpiece is immersed in a passivating agent solution, the pH value of the passivating agent solution is controlled to be 4.0 by phosphoric acid or sodium hydroxide, the temperature is controlled to be 30 ℃, after 8 minutes of treatment, a passivation protective film is formed on the surface of the metal workpiece, the metal workpiece is taken out and dried for 15 minutes at the temperature of 70 ℃, and the metal workpiece is dried.
[0025] The treated metal plating piece has bright appearance surface, uniform color, no abnormal phenomena such as pitting, spot and the like, and the neutral salt spray test is over 36 inches.
[0026] Example 3
[0027] The passivator comprises the following components in parts by weight (calculated by 1000 total weight parts): 3 parts of chromium trichloride, 20 parts of acidic silica sol, 4 parts of gamma-aminopropyl triethoxy silane, 2 parts of citric acid and the balance of distilled water are stirred and uniformly mixed to prepare a passivating agent.
[0028] The passivation treatment method comprises the following steps: after a metal workpiece is coated, a metal plated part is immersed in a passivating agent solution, the value of p Η of the passivating agent solution is controlled to be 4.0 by phosphoric acid or sodium hydroxide, the temperature is 30 ℃, after 8 minutes of treatment, a passivation protective film is formed on the surface of the metal plated part, and the metal plated part is taken out and dried for 15 minutes at the temperature of 80 ℃.
[0029] The treated metal plating piece has bright appearance surface, uniform color, no abnormal phenomena such as pitting corrosion, spot mark and the like, and the neutral salt spray test is more than 48 inches.
[0030] Example 4
[0031] The passivator comprises the following components in parts by weight (calculated by 1000 total weight parts): 4 parts of chromium trichloride, 25 parts of acidic silica sol, 5 parts of gamma-aminopropyl triethoxy silane, 2.5 parts of citric acid and the balance of distilled water are stirred and uniformly mixed to prepare a passivating agent.
[0032] The passivation treatment method comprises the following steps: after a metal workpiece is coated, a metal plated part is immersed in a passivating agent solution, the value of p Η of the passivating agent solution is controlled to be 4.0 by phosphoric acid or sodium hydroxide, the temperature is 30 ℃, after 8 minutes of treatment, a passivation protective film is formed on the surface of the metal plated part, and the metal plated part is taken out and dried for 12 minutes at the temperature of 80 ℃.
[0033] The treated metal plating piece has bright appearance surface, uniform color, no abnormal phenomena such as pitting corrosion, spot mark and the like, and the neutral salt spray test is more than 60 inches.
[0034] Example 5
[0035] The passivator comprises the following components in parts by weight (calculated by 1000 total weight parts): 5 parts of chromium trichloride, 30 parts of acidic silica sol, 6 parts of gamma-aminopropyl triethoxy silane, 3 parts of citric acid and the balance of distilled water are stirred and uniformly mixed to prepare a passivating agent.
[0036] The passivation treatment method comprises the following steps: after a metal workpiece is coated, a metal plated part is immersed in a passivating agent solution, the value of PH of the passivating agent solution is controlled to be 4.0 by phosphoric acid or sodium hydroxide, the temperature is controlled to be 30 ℃, after 8 minutes of treatment, a passivation protective film is formed on the surface of the metal plated part, and the metal plated part is taken out and dried at the temperature of 70 ℃ for 20 minutes.
[0037] The treated metal plating piece has bright appearance surface, uniform color, no abnormal phenomena such as pitting corrosion, spot mark and the like, and the neutral salt spray test is more than 60 inches.
[0038] 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 are included in the scope of the present invention as claimed.
Claims (1)
- Claims[ claim 1] A passivator, characterized in that, calculated by 1000 parts by weight, the passivator comprises the following components in parts by weight: 1-5 parts of chromium trichloride, 5-30 parts of acidic silica sol, 2-6 parts of gamma-aminopropyltriethoxysilane, 0.5-3 parts of citric acid and the balance of distilled water.[ claim 2] the passivator according to claim 1, characterized in that the part by weight of the chromium trichloride is 2-4 parts.[ claim 3] the passivating agent according to claim 1, wherein the acidic silica sol is present in an amount of 10 to 20 parts by weight.[ claim 4] the passivating agent according to claim 1, wherein the weight part of the gamma-aminopropyltriethoxylethane is 3-5 parts.[ claim 5] the passivating agent according to claim 1, wherein the citric acid is 1 part by weight-2 parts of I's'[ claim 6] the passivating agent according to claim 1, wherein the pH value is 3.0-6.0, and is adjusted with phosphoric acid or sodium hydroxide, and the treatment temperature is 20-80 ℃.[ claim 7] A method for passivating a surface of a metal workpiece having a metal plating film thereon, characterized by comprising the steps of: formulating a deactivant according to any one of claims 1 to 6; and (3) treating the metal plated part by using a passivating agent, controlling the pH value of the solution within the range of 3.0-6.0, and forming a passivation protective film on the surface of the metal plated part after treating for a preset time.[ claim 8] the method for passivating a surface of a metal workpiece according to claim 7, wherein the treatment of the metal plated part with the solution of the passivating agent includes a dipping method, a spraying method or a brushing method, and the temperature is controlled to be 20 to 80 ℃ and the treatment time is 3 to 10 minutes during the treatment with the solution of the passivating agent.[ claim 9] A metal workpiece having a metal-plated film on a surface thereof, characterized in that the metal-plated film has a passivation film formed thereon according to the method for passivating a surface of a metal workpiece according to claim 8.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/091551 WO2019006616A1 (en) | 2017-07-03 | 2017-07-03 | Passivator, metal workpiece and method of surface passivation therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110809634A true CN110809634A (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780092837.5A Withdrawn CN110809634A (en) | 2017-07-03 | 2017-07-03 | Passivating agent, metal workpiece and surface passivation method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN110809634A (en) |
| WO (1) | WO2019006616A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112126921A (en) * | 2020-08-24 | 2020-12-25 | 安徽未来表面技术有限公司 | Aluminum and aluminum alloy trivalent chromium hydrophilic agent and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110172689B (en) * | 2019-05-09 | 2021-01-29 | 东北大学 | Zinc layer trivalent chromium color passivation treating fluid used at normal temperature and preparation and use methods thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH093655A (en) * | 1995-06-22 | 1997-01-07 | Sumitomo Metal Ind Ltd | Production of stainless steel member excellent in corrosion resistance |
| CN102011112A (en) * | 2010-12-15 | 2011-04-13 | 济南德锡科技有限公司 | Zinc and zinc alloy plating black passivation solution and preparation method thereof |
| CN102586768A (en) * | 2011-01-10 | 2012-07-18 | 中国石油化工股份有限公司 | Zinc layer surface passivating treatment liquid |
| US20130037175A1 (en) * | 2011-08-10 | 2013-02-14 | Basf Se | Preparation of itaconic acid homo- or copolymers and amine- or amide- containing alcohols for metal surface treatment |
| CN103898496A (en) * | 2012-12-27 | 2014-07-02 | 苏州禾川化工新材料科技有限公司 | Novel silane nano trivalent chromium passivation solution and preparation method thereof |
| CN105603402A (en) * | 2016-03-11 | 2016-05-25 | 三峡大学 | Trivalent chromium passivator concentrated solution and preparation method |
-
2017
- 2017-07-03 WO PCT/CN2017/091551 patent/WO2019006616A1/en active Application Filing
- 2017-07-03 CN CN201780092837.5A patent/CN110809634A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH093655A (en) * | 1995-06-22 | 1997-01-07 | Sumitomo Metal Ind Ltd | Production of stainless steel member excellent in corrosion resistance |
| CN102011112A (en) * | 2010-12-15 | 2011-04-13 | 济南德锡科技有限公司 | Zinc and zinc alloy plating black passivation solution and preparation method thereof |
| CN102586768A (en) * | 2011-01-10 | 2012-07-18 | 中国石油化工股份有限公司 | Zinc layer surface passivating treatment liquid |
| US20130037175A1 (en) * | 2011-08-10 | 2013-02-14 | Basf Se | Preparation of itaconic acid homo- or copolymers and amine- or amide- containing alcohols for metal surface treatment |
| CN103898496A (en) * | 2012-12-27 | 2014-07-02 | 苏州禾川化工新材料科技有限公司 | Novel silane nano trivalent chromium passivation solution and preparation method thereof |
| CN105603402A (en) * | 2016-03-11 | 2016-05-25 | 三峡大学 | Trivalent chromium passivator concentrated solution and preparation method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112126921A (en) * | 2020-08-24 | 2020-12-25 | 安徽未来表面技术有限公司 | Aluminum and aluminum alloy trivalent chromium hydrophilic agent and preparation method thereof |
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| WO2019006616A1 (en) | 2019-01-10 |
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Application publication date: 20200218 |