CN110832114A - Passivating agent, metal workpiece and surface treatment method thereof - Google Patents
Passivating agent, metal workpiece and surface treatment method thereof Download PDFInfo
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- CN110832114A CN110832114A CN201780092836.0A CN201780092836A CN110832114A CN 110832114 A CN110832114 A CN 110832114A CN 201780092836 A CN201780092836 A CN 201780092836A CN 110832114 A CN110832114 A CN 110832114A
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- passivating agent
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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
Abstract
The passivator, a metal workpiece and a surface treatment method thereof are characterized in that the passivator comprises the following components in parts by weight, based on 1000 parts by weight: 5-20 parts of chromium nitrate, 1-5 parts of cobalt sulfate, 1-5 parts of monopotassium phosphate, 1-5 parts of hydrogen peroxide, 2-5 parts of ammonium molybdate, l-3 parts of thiourea, 0.5-4 parts of magnesium chloride and the balance of distilled water. The passivated galvanized sheet forms a black firm protective film on the surface of the plating layer, the performances of corrosion resistance, oxidation resistance, decoration 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 treatment method thereof
[0001] The invention relates to the technical field of surface treatment, in particular to a passivator, a metal workpiece and a surface treatment method thereof.
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 treatment 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: 5-20 parts of chromium nitrate, 1-5 parts of cobalt sulfate, 1-5 parts of monopotassium phosphate, 1-5 parts of hydrogen peroxide, 2-5 parts of ammonium molybdate, 1-3 parts of thiourea, 0.5-4 parts of magnesium chloride and the balance of distilled water.
[0006] A surface treatment method for a metal workpiece, wherein the surface of the metal workpiece is provided with a metal coating, comprises the following steps: preparing the passivating agent, treating the metal plated part by using the passivating agent, controlling the pH value of a solution within the range of 2.0-4.0, and forming a passivation protective film on the surface of the metal plated part after treating for a preset time.
[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 treatment 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, decoration property and other properties on metal and a plating layer, a black firm protective film is formed on the surface of the plating layer after drying, the corrosion resistance, oxidation resistance, decoration property 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 coating, and is a better choice for corrosion resistance and discoloration prevention of 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, 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. 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: 5-20 parts of chromium nitrate, 1-5 parts of cobalt sulfate, 1-5 parts of monopotassium phosphate, 1-5 parts of hydrogen peroxide, 2-5 parts of ammonium molybdate, 1-3 parts of thiourea, 0.5-4 parts of magnesium chloride and the balance of distilled water.
[0011] Preferably, the weight part of the chromium nitrate is preferably 10 to 15 parts. The weight part of the cobalt sulfate is preferably 2 to 4 parts. The weight portion of the potassium dihydrogen phosphate is preferably 2 to 4 parts. The preferred weight portion of the hydrogen peroxide is 2-4 portions. The weight parts of ammonium molybdate are preferably 3 to 4 parts. The weight portion of thiourea is preferably 1 to 2 parts. The weight portion of the magnesium chloride is preferably 2 to 3 portions
[0012] The passivating agent is controlled in the range of 2.0-4.0 when in use. In the passivating agent, chromium nitrate is the main component of the passivating film, monopotassium phosphate is a pH buffering agent, cobalt sulfate and ammonium molybdate are blackening agents, hydrogen peroxide is an oxidizing agent, and thiourea and magnesium chloride are film forming auxiliary agents.
[0013] The embodiment of the invention also provides a metal workpiece surface treatment method, which comprises the following steps: preparing the passivator, treating the metal plated part by using a passivator solution, controlling the pH value of the solution to be within the range of 2.0-4.0, forming a passivation protective film on the surface of the metal plated part after treating for a preset time, and naturally drying or baking.
[0014] The metal plated part is treated with 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 temperature is preferably controlled to be 40-60 ℃, and the time between treatments is preferably 10-20 seconds.
[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 or chemical plating. The metal plating film is formed with a passivation film according to the above-described surface treatment method for a metal workpiece. The metal plated part is preferably a galvanized metal workpiece.
[0016] The processing object of the metal plated part can be but is not limited to a galvanized part, after the surface treatment, the surface of the metal workpiece has good protection effect, the formed protective film has strong passivation property, oxidation resistance, decoration property and other properties on metal and a plating layer, a black firm protective film is formed on the surface of the plating layer after drying, the corrosion resistance, oxidation resistance, decoration property and other properties are greatly enhanced, and the method is the best choice for preventing corrosion and discoloration 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 passivating agent is a water-soluble anticorrosion passivating 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): 5 parts of chromium nitrate, 1 part of cobalt sulfate, 1 part of monopotassium phosphate, 1 part of hydrogen peroxide, 2 parts of ammonium molybdate, 1 part of thiourea, 0.5 part of magnesium chloride 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, the metal workpiece is immersed in a passivating agent solution, the pH value of the passivating agent solution is controlled to be 3.0 by phosphoric acid or ammonia water, the temperature is controlled to be 40 ℃, after 30 seconds of treatment, a passivation protective film is formed on the surface of the metal workpiece, and the metal workpiece is taken out and dried at the temperature of 80 ℃ for 15 minutes.
[0021] The treated metal plating piece has bright appearance surface, black and oily appearance, uniform color, no abnormality such as pitting corrosion, spot mark and the like, and the neutral salt spray test is more than 14 inches.
[0022] Example 2
[0023] The passivator comprises the following components in parts by weight (calculated by 1000 total weight parts): 9 parts of chromium nitrate, 2 parts of cobalt sulfate, 2 parts of monopotassium phosphate, 2 parts of hydrogen peroxide, 3 parts of ammonium molybdate, 1.5 parts of thiourea, 1.5 parts of magnesium chloride and the balance of distilled water, stirring and uniformly mixing to prepare the passivation 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 ammonia water, the temperature is controlled to be 40 ℃, after 25 seconds of treatment, a passivation protective film is formed on the surface of the metal workpiece, and the metal workpiece is taken out and dried at the temperature of 80 ℃ for 15 minutes.
[0025] The treated metal plating piece has bright appearance surface, black and oily appearance, uniform color, no abnormality such as pitting corrosion, spot mark and the like, and the neutral salt spray test is more than 23 inches.
[0026] Example 3
[0027] The passivator comprises the following components in parts by weight (calculated by 1000 total weight parts): 13 parts of chromium nitrate, by weight,
3 parts of cobalt sulfate, 3 parts of monopotassium phosphate, 3 parts of hydrogen peroxide, 3.5 parts of ammonium molybdate, 2.4 parts of thiourea, 2 parts of magnesium chloride and the balance of distilled water, stirring and uniformly mixing to prepare the passivator.
[0028] 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 ammonia water, the temperature is controlled to be 40 ℃, after 20 seconds of treatment, a passivation protective film is formed on the surface of the metal workpiece, and the metal workpiece is taken out and dried at the temperature of 80 ℃ for 15 minutes.
[0029] The treated metal plating piece has bright appearance surface, black and oily appearance, uniform color, no abnormality such as pitting corrosion, spot mark and the like, and the neutral salt spray test is over 32 inches.
[0030] Example 4
[0031] The passivator comprises the following components in parts by weight (calculated by 1000 total weight parts): 16 parts of chromium nitrate, 4 parts of cobalt sulfate, 4 parts of monopotassium phosphate, 4 parts of hydrogen peroxide, 4 parts of ammonium molybdate, 2.6 parts of thiourea, 3 parts of magnesium chloride and the balance of distilled water, stirring and uniformly mixing to prepare the passivation agent.
[0032] 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 4.5 by phosphoric acid or ammonia water, the temperature is controlled to be 40 ℃, after 15 seconds of treatment, a passivation protective film is formed on the surface of the metal workpiece, and the metal workpiece is taken out and dried at the temperature of 80 ℃ for 15 minutes.
[0033] The treated metal plating piece has bright appearance surface, black and oily appearance, uniform color, no abnormality such as pitting corrosion, spot mark and the like, and the neutral salt spray test is more than 48 inches. [0034] Example 5
[0035] The passivator comprises the following components in parts by weight (calculated by 1000 total weight parts): 20 parts of chromium nitrate, 5 parts of cobalt sulfate, 5 parts of monopotassium phosphate, 5 parts of hydrogen peroxide, 5 parts of ammonium molybdate, 3 parts of thiourea, 4 parts of magnesium chloride and the balance of distilled water, stirring and uniformly mixing to prepare the passivation agent.
[0036] 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 5.0 by phosphoric acid or ammonia water, the temperature is controlled to be 40 ℃, after 15 seconds of treatment, a passivation protective film is formed on the surface of the metal workpiece, and the metal workpiece is taken out and dried at the temperature of 80 ℃ for 15 minutes.
[0037] The treated metal plating piece has bright appearance surface, black and oily appearance, uniform color, no abnormality such as pitting corrosion, spot mark and the like, and the neutral salt spray test is more than 40 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: 5-20 parts of chromium nitrate, 1-5 parts of cobalt sulfate, 1-5 parts of monopotassium phosphate, 1-5 parts of hydrogen peroxide, 2-5 parts of ammonium molybdate, 1-3 parts of thiourea, 0.5-4 parts of magnesium chloride and the balance of distilled water.[ claim 2] the passivating agent according to claim 1, wherein the chromium nitrate is 1 part by weight0-15 parts.[ claim 3] the passivating agent according to claim 1, wherein the cobalt sulfate is 2 parts by weight4 parts by weight.[ claim 4] the passivating agent according to claim 1, wherein the weight part number of the monopotassium phosphate is 2-4 parts.[ claim 5] the passivating agent according to claim 1, wherein the hydrogen peroxide is 2 parts by weight4 parts by weight.The passivating agent according to claim 6, wherein the weight part of the ammonium molybdate is 34 parts of nitrothiourea and 1-2 parts of magnesium chloride.[ claim 7] the passivating agent according to claim 1, wherein the pH value is 2.0-4.0, and is adjusted by phosphoric acid or ammonia water, and the treatment temperature of the passivating agent is 30-80 ℃.[ claim 8] A surface treatment method for a metal workpiece having a metal plating film on a surface thereof, characterized by comprising the steps of: formulating a deactivant according to any one of claims 1 to 7; and (3) treating the metal plated part by using a passivating agent, controlling the pH value of the solution within the range of 2.0-4.0, and forming a passivation protective film on the surface of the metal plated part after treating for a preset time.The method according to claim 9, wherein the treatment of the metal workpiece with the solution of the passivating agent comprises a dipping method, a spraying method or a brushing method, and the temperature is controlled to be 30 to 80 ℃ and the treatment time is 5 to 30 seconds during the treatment with the solution of the passivating agent.[ claim 10] A metal workpiece having a metal-plated film on a surface thereof, characterized in that the metal-plated film is formed with a passivation film thereon according to the metal workpiece surface treatment method of claim 8.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/091555 WO2019006620A1 (en) | 2017-07-03 | 2017-07-03 | Passivator, metal workpiece and surface processing method thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN110832114A true CN110832114A (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780092836.0A Withdrawn CN110832114A (en) | 2017-07-03 | 2017-07-03 | Passivating agent, metal workpiece and surface treatment method thereof |
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| Country | Link |
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| CN (1) | CN110832114A (en) |
| WO (1) | WO2019006620A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3535168A (en) * | 1967-10-13 | 1970-10-20 | Hooker Chemical Corp | Metal treating process |
| CN101338421A (en) * | 2007-07-03 | 2009-01-07 | 天津市瀚隆镀锌有限公司 | Preparation of colorful passivation treatment agent after steel galvanization |
| 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 |
| CN102268664A (en) * | 2011-07-28 | 2011-12-07 | 顺德职业技术学院 | Chromium-free passivating solution used for black passivation treatment of zinc plating and preparation method thereof |
| CN102925883A (en) * | 2012-11-29 | 2013-02-13 | 郭衡怀 | Multifunctional metal surface treatment solution |
| CN104894549A (en) * | 2015-06-18 | 2015-09-09 | 广西柳州市龙发金属表面处理技术有限公司 | Preparation technology of trivalent chromium black zinc passivating solution |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009256697A (en) * | 2008-04-11 | 2009-11-05 | Tomiya Masayasu | Treatment agent for forming chemical conversion film on metal or alloy |
| WO2010070728A1 (en) * | 2008-12-16 | 2010-06-24 | 日本パーカライジング株式会社 | Surface treating agent for metallic materials |
| CN104342676A (en) * | 2013-07-25 | 2015-02-11 | 无锡市石塘湾工业园区开发建设有限公司 | Galvanized layer chromium-free passivation film treatment liquid |
-
2017
- 2017-07-03 CN CN201780092836.0A patent/CN110832114A/en not_active Withdrawn
- 2017-07-03 WO PCT/CN2017/091555 patent/WO2019006620A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3535168A (en) * | 1967-10-13 | 1970-10-20 | Hooker Chemical Corp | Metal treating process |
| CN101338421A (en) * | 2007-07-03 | 2009-01-07 | 天津市瀚隆镀锌有限公司 | Preparation of colorful passivation treatment agent after steel galvanization |
| 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 |
| CN102268664A (en) * | 2011-07-28 | 2011-12-07 | 顺德职业技术学院 | Chromium-free passivating solution used for black passivation treatment of zinc plating and preparation method thereof |
| CN102925883A (en) * | 2012-11-29 | 2013-02-13 | 郭衡怀 | Multifunctional metal surface treatment solution |
| CN104894549A (en) * | 2015-06-18 | 2015-09-09 | 广西柳州市龙发金属表面处理技术有限公司 | Preparation technology of trivalent chromium black zinc passivating solution |
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| WO2019006620A1 (en) | 2019-01-10 |
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