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CN114107969A - Passivation solution and preparation method of blue-white passivation film - Google Patents

Passivation solution and preparation method of blue-white passivation film Download PDF

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Publication number
CN114107969A
CN114107969A CN202111422395.0A CN202111422395A CN114107969A CN 114107969 A CN114107969 A CN 114107969A CN 202111422395 A CN202111422395 A CN 202111422395A CN 114107969 A CN114107969 A CN 114107969A
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passivation
white
blue
solution
film
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刘娟
郭凯
吴群
关飞
李辉
张洁
杨忠丰
李智
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Shanxi Fenxi Heavy Industry Co Ltd
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Shanxi Fenxi Heavy Industry Co Ltd
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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
    • C23C22/78—Pretreatment of the material to be coated
    • 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
    • C23C22/82—After-treatment

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

Abstract

The invention discloses a passivation solution and a preparation method of a blue-white passivation film, wherein the concentration of each component in the passivation solution is as follows: CrF3：110～130g/L；NaNO3：3～4g/L；NH4NO3：3～4g/L；Mo3++Co2+：0.2～0.4g/L；H2SO4: 0.5 to 0.8 g/L. The preparation method comprises the following steps: pretreating a galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The passivation solution overcomes the defects of high toxicity, environmental pollution and the like of the hexavalent chromate passivation technology, and is an environment-friendly passivation solution; the passivation solution has stable performance, lower production cost and simple use process. Preparation Using the passivation solution of the present inventionThe obtained blue-white passivation film is uniform in film formation and high in corrosion resistance, and the time of a white corrosion product in a neutral salt spray test is 84 hours, which is far longer than the time of a normal hexavalent chromium passivation film test.

Description

Passivation solution and preparation method of blue-white passivation film
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a preparation method of a passivation solution and a blue-white passivation film.
Background
The losses to humans from corrosion are enormous. According to the Chinese corrosion survey report, 1t of steel is corroded to rust every 90s in the world, metal materials and equipment scrapped due to corrosion in the world are about 20% of the production quantity, and the economic loss of developed countries caused by metal corrosion accounts for about 2-4% of the total value of national economy. The limited resources on the earth are increasingly exhausted, and with the development of global industry, besides direct loss, the problem of corrosion is becoming more and more serious. Although the work of pollution control and research is ongoing worldwide and corrosion protection technology is continuously developed to alleviate the corrosion problem, the corrosion of metals is still very serious in general.
Therefore, various protective measures should be taken. The zinc plating passivation corrosion prevention is wide, and the zinc plating passivation corrosion prevention method is applied to various metal protection industries, such as hardware electromechanical industry, aerospace materials, electronic equipment and the like. The passivation technology mainly comprises silver white passivation, blue white passivation, color passivation and black passivation, and passivation films obtained by different passivation processes have different corrosion resistances.
The blue-white passivation technology is simple and elegant in appearance, excellent in performance and deeply favored by the market, is one of the most main post-treatment technologies of galvanized parts, the treated galvanized parts are light blue and bright in appearance, the original color of the galvanized parts can be kept, the corrosion resistance of products is improved, and therefore the blue-white passivation technology is widely applied to various metal protection industries. However, the blue and white passivation film obtained by the existing passivation solution technology is thin, uneven in distribution, unsatisfactory in corrosion resistance effect, and prone to be colored.
Aiming at the problems of thin blue and white passive film, uneven distribution and poor corrosion resistance effect in the prior art, no effective solution is provided at present.
Disclosure of Invention
The embodiment of the invention provides a passivation solution and a preparation method of a blue-white passivation film, and aims to solve the problems of thin blue-white passivation film, uneven distribution and poor corrosion resistance in the prior art.
In order to achieve the above object, in one aspect, the present invention provides a passivation solution, wherein the concentration of each component in the passivation solution is: CrF3：110～130g/L；NaNO3：3～4g/L；NH4NO3：3～4g/L；Mo3++Co2+：0.2～0.4g/L；H2SO4：0.5～0.8g/L。
In another aspect, the present invention provides a method for preparing a blue-white passivation film using the above passivation solution, the method comprising: pretreating a galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film.
Optionally, after the generating of the blue-white passivation film, the method includes: and drying the blue and white passivation film.
Optionally, the pH value of the passivation solution is 2.5-3.5.
Optionally, the passivation time is 30-60 s.
Optionally, the passivation temperature is 20-40 ℃.
Optionally, the drying time is 5-20 min.
Optionally, the drying temperature is 85-180 ℃.
The invention has the beneficial effects that:
the invention provides a passivation solution and a preparation method of a blue-white passivation film, wherein each component in the passivation solutionThe concentration of (A) is as follows: CrF3：110～130g/L；NaNO3：3～4g/L；NH4NO3：3～4g/L；Mo3++Co2+：0.2～0.4g/L；H2SO4: 0.5 to 0.8 g/L. The preparation method comprises the following steps: pretreating a galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The passivation solution overcomes the defects of high toxicity, environmental pollution and the like of the hexavalent chromate passivation technology, and is an environment-friendly passivation solution; the passivation solution has stable performance, lower production cost and simple use process. The blue-white passivation film prepared by the passivation solution has the advantages of uniform film formation and high corrosion resistance, and the time of a white corrosion product in a neutral salt spray test is 84 hours, which is far longer than the time of a normal hexavalent chromium passivation film test.
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Fig. 1 is a flowchart of a method for preparing a blue-white passivation film by using a passivation solution according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The blue-white passivation technology is simple and elegant in appearance, excellent in performance and deeply favored by the market, is one of the most main post-treatment technologies of galvanized parts, the treated galvanized parts are light blue and bright in appearance, the original color of the galvanized parts can be kept, the corrosion resistance of products is improved, and therefore the blue-white passivation technology is widely applied to various metal protection industries. However, the blue and white passivation film obtained by the existing passivation solution technology is thin, uneven in distribution, unsatisfactory in corrosion resistance effect, and prone to be colored.
Thus, the present inventionThe invention provides a preparation method of a passivation solution and a blue-white passivation film. Wherein, the concentration of each component in the passivation solution is as follows: CrF3：110～130g/L；NaNO3：3～4g/L；NH4NO3：3～4g/L；Mo3++Co2+：0.2～0.4g/L；H2SO4：0.5～0.8g/L。
CrF3Is a trivalent chromium compound which is used as a film forming agent of the passivation solution; NaNO3As an oxidant of the passivation solution, the zinc can react with the zinc coating during passivation to dissolve the zinc to generate Zn2+。CrF3With Zn2+The reaction produces an insoluble zinc chromium oxide barrier layer. NH (NH)4NO3As a complexing agent of the passivation solution, a stable complex can be formed with trivalent chromium ions. Mo3++Co2+The corrosion resistance of the passivation solution is improved. H2SO4The passivation solution can keep a certain pH value, and the normal operation of passivation reaction is ensured.
Fig. 1 is a method for preparing a blue-white passivation film by a passivation solution according to an embodiment of the present invention, as shown in fig. 1, the method includes:
s101, preprocessing a galvanized workpiece;
s102, placing the pretreated galvanized workpiece into the passivation solution for passivation so as to enable zinc in the galvanized workpiece to be continuously dissolved and generate a blue-white passivation film.
In an optional embodiment, after the S102, the method further includes:
and S103, drying the blue and white passivation film.
Specifically, the pH value of the passivation solution is 2.5-3.5. The passivation time is 30-60 s. The passivation temperature is 20-40 ℃. And the drying time is 5-20 min. The drying temperature is 85-180 ℃.
Controlling the pH value of the passivation solution: the mechanism of passivation is known as: the pH value not only affects the rate of new dissolution and re-dissolution of the passivation film, but also affects the time that the workpiece stays in the passivation solution. Therefore, in order to obtain a stable and ideal passivation film, the pH of the passivation solution is kept relatively stable, otherwise the thickness of the passivation film is likely to be uneven. When the pH value is lower than 2.5, a passivation film is difficult to form, a thicker passivation film is difficult to obtain, the color is lighter, and the corrosion resistance is poorer; when the pH value is higher than 3.5, the binding force of the passive film is influenced, the plating layer is loose, the surface light sensation is poor, and the fog and the flower are easy to generate. According to the experimental results, the color is easy to develop when the pH value is low, the color becomes white when the pH value is high, and the pH value is preferably between 2.5 and 3.5.
The proper passivation time is the most important factor in the passivation process, when the galvanized workpiece is placed in the passivation solution, zinc in the galvanized workpiece is dissolved and a passivation film is generated, the longer the contact time of the passivation solution and the galvanized workpiece is, the more chance of transfer plating is, and in most cases, a thicker passivation film is caused, so that the corrosion resistance is good; however, the formation of the passivation film is a dynamic process, and the passivation film is continuously generated, dissolved, regenerated and re-dissolved on the interface. Therefore, a suitable passivation time should be selected. When other conditions (concentration, temperature, pH, etc.) are constant, the passivation time is short, the film thickness is thin, and the film color is light and the corrosion resistance is poor. When the passivation time is long, the film layer becomes loose and porous, the bonding strength is low, and the corrosion resistance is reduced. Therefore, during operation, it is necessary to monitor the passivation time at any time. Specifically, the passivation time is controlled to be 30-60 s.
Besides the control of the passivation time, the control of the passivation temperature is also required, and the temperature control of the trivalent chromium passivation solution is closely related to the formation rate of a passivation film. When the temperature of the passivation solution is too low and too high, the result is color cast and the desired color cannot be obtained. Under the same passivation time and pH value conditions, the higher the temperature of the passivation solution is, the thicker the passivation film is; the lower the temperature of the passivation film, the thinner the passivation film. Specifically, the passivation temperature is controlled to be 20-40 ℃.
The technical scheme of the invention is further illustrated by the following specific examples:
example 1
Preparing a passivation solution, wherein the concentration of each component in the passivation solution is as follows: CrF3：110g/L；NaNO3：3g/L；NH4NO3：3g/L；Mo3++Co2+：0.2g/L；H2SO4：0.5g/L。
Pretreating a galvanized workpiece, wherein the pretreatment comprises the steps of cleaning and deoiling the galvanized workpiece, and drying the cleaned galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The pH value of the passivation solution is 2.5. The time for the passivation was 30 s. The temperature of the passivation was 20 ℃. And after the blue-white passivation film is generated, drying the blue-white passivation film. The drying time is 5 min. The drying temperature is 85 ℃. The thickness of the plating layer obtained in this example was 12.3 μm.
Example 2
Preparing a passivation solution, wherein the concentration of each component in the passivation solution is as follows: CrF3：110g/L；NaNO3：4g/L；NH4NO3：4g/L；Mo3++Co2+：0.4g/L；H2SO4：0.5g/L。
Pretreating a galvanized workpiece, wherein the pretreatment comprises the steps of cleaning and deoiling the galvanized workpiece, and drying the cleaned galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The pH value of the passivation solution is 2.5. The time for the passivation was 40 s. The temperature of the passivation was 25 ℃. And after the blue-white passivation film is generated, drying the blue-white passivation film. The drying time is 10 min. The drying temperature is 110 ℃. The thickness of the plating layer obtained in this example was 12.4. mu.m.
Example 3
Preparing a passivation solution, wherein the concentration of each component in the passivation solution is as follows: CrF3：115g/L；NaNO3：3g/L；NH4NO3：3g/L；Mo3++Co2+：0.2g/L；H2SO4：0.7g/L。
Pretreating a galvanized workpiece, wherein the pretreatment comprises the steps of cleaning and deoiling the galvanized workpiece, and drying the cleaned galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The pH value of the passivation solution is 3. The time for the passivation was 50 s. The temperature of the passivation was 30 ℃. And after the blue-white passivation film is generated, drying the blue-white passivation film. The drying time is 15 min. The temperature of the drying is 140 ℃. The thickness of the plating layer obtained in this example was 12.6. mu.m.
Example 4
Preparing a passivation solution, wherein the concentration of each component in the passivation solution is as follows: CrF3：115g/L；NaNO3：4g/L；NH4NO3：4g/L；Mo3++Co2+：0.4g/L；H2SO4：0.7g/L。
Pretreating a galvanized workpiece, wherein the pretreatment comprises the steps of cleaning and deoiling the galvanized workpiece, and drying the cleaned galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The pH value of the passivation solution is 3. The time for the passivation was 55 s. The temperature of the passivation was 35 ℃. And after the blue-white passivation film is generated, drying the blue-white passivation film. The drying time is 18 min. The temperature of the drying is 160 ℃. The thickness of the plating layer obtained in this example was 12.9 μm.
Example 5
Preparing a passivation solution, wherein the concentration of each component in the passivation solution is as follows: CrF3：120g/L；NaNO3：3g/L；NH4NO3：3g/L；Mo3++Co2+：0.2g/L；H2SO4：0.6g/L。
Pretreating a galvanized workpiece, wherein the pretreatment comprises the steps of cleaning and deoiling the galvanized workpiece, and drying the cleaned galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The pH value of the passivation solution is 3.5. The time for the passivation was 60 s. The temperature of the passivation was 40 ℃. And after the blue-white passivation film is generated, drying the blue-white passivation film. The drying time is 20 min. The drying temperature is 180 ℃. The thickness of the plating layer obtained in this example was 13.5. mu.m.
Example 6
Preparing a passivation solution, wherein the concentration of each component in the passivation solution is as follows: CrF3：120g/L；NaNO3：4g/L；NH4NO3：4g/L；Mo3++Co2+：0.3g/L；H2SO4：0.6g/L。
Pretreating a galvanized workpiece, wherein the pretreatment comprises the steps of cleaning and deoiling the galvanized workpiece, and drying the cleaned galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The pH value of the passivation solution is 2.5. The time for the passivation was 30 s. The temperature of the passivation was 20 ℃. And after the blue-white passivation film is generated, drying the blue-white passivation film. The drying time is 5 min. The drying temperature is 85 ℃. The thickness of the plating layer obtained in this example was 13.7 μm.
Example 7
Preparing a passivation solution, wherein the concentration of each component in the passivation solution is as follows: CrF3：125g/L；NaNO3：3g/L；NH4NO3：3g/L；Mo3++Co2+：0.4g/L；H2SO4：0.7g/L。
Pretreating a galvanized workpiece, wherein the pretreatment comprises the steps of cleaning and deoiling the galvanized workpiece, and drying the cleaned galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The pH value of the passivation solution is 2.5. The time for the passivation was 40 s. The temperature of the passivation was 25 ℃. And after the blue-white passivation film is generated, drying the blue-white passivation film. The drying time is 10 min. The drying temperature is 110 ℃. The thickness of the plating layer obtained in this example was 14.2. mu.m.
Example 8
Preparing a passivation solutionConcentration of each component in the chemical solution: CrF3：125g/L；NaNO3：4g/L；NH4NO3：4g/L；Mo3++Co2+：0.2g/L；H2SO4：0.7g/L。
Pretreating a galvanized workpiece, wherein the pretreatment comprises the steps of cleaning and deoiling the galvanized workpiece, and drying the cleaned galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The pH value of the passivation solution is 3. The time for the passivation was 50 s. The temperature of the passivation was 30 ℃. And after the blue-white passivation film is generated, drying the blue-white passivation film. The drying time is 15 min. The temperature of the drying is 140 ℃. The thickness of the plating layer obtained in this example was 14.5. mu.m.
Example 9
Preparing a passivation solution, wherein the concentration of each component in the passivation solution is as follows: CrF3：130g/L；NaNO3：3g/L；NH4NO3：3g/L；Mo3++Co2+：0.3g/L；H2SO4：0.8g/L。
Pretreating a galvanized workpiece, wherein the pretreatment comprises the steps of cleaning and deoiling the galvanized workpiece, and drying the cleaned galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The pH value of the passivation solution is 3.2. The time for the passivation was 55 s. The temperature of the passivation was 35 ℃. And after the blue-white passivation film is generated, drying the blue-white passivation film. The drying time is 18 min. The temperature of the drying is 160 ℃. The thickness of the plating layer obtained in this example was 14.8. mu.m.
Example 10
Preparing a passivation solution, wherein the concentration of each component in the passivation solution is as follows: CrF3：130g/L；NaNO3：4g/L；NH4NO3：4g/L；Mo3++Co2+：0.4g/L；H2SO4：0.8g/L。
Pretreating a galvanized workpiece, wherein the pretreatment comprises the steps of cleaning and deoiling the galvanized workpiece, and drying the cleaned galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The pH value of the passivation solution is 3.5. The time for the passivation was 60 s. The temperature of the passivation was 40 ℃. And after the blue-white passivation film is generated, drying the blue-white passivation film. The drying time is 20 min. The drying temperature is 180 ℃. The thickness of the plating layer obtained in this example was 15 μm.
The invention has the beneficial effects that:
the invention provides a passivation solution and a preparation method of a blue-white passivation film, wherein the concentration of each component in the passivation solution is as follows: CrF3：110～130g/L；NaNO3：3～4g/L；NH4NO3：3～4g/L；Mo3++Co2+：0.2～0.4g/L；H2SO4: 0.5 to 0.8 g/L. The preparation method comprises the following steps: pretreating a galvanized workpiece; and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film. The passivation solution overcomes the defects of high toxicity, environmental pollution and the like of the hexavalent chromate passivation technology, and is an environment-friendly passivation solution; the passivation solution has stable performance, lower production cost and simple use process. The blue-white passivation film prepared by the passivation solution has the advantages of uniform film formation and high corrosion resistance, and the time of a white corrosion product in a neutral salt spray test is 84 hours, which is far longer than the time of a normal hexavalent chromium passivation film test.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. The passivation solution is characterized in that the concentration of each component in the passivation solution is as follows:
CrF3：110～130g/L；NaNO3：3～4g/L；NH4NO3：3～4g/L；Mo3++Co2+：0.2～0.4g/L；H2SO4：0.5～0.8g/L。
2. a method for preparing a blue-white passivation film by the passivation solution of claim 1, comprising:
pretreating a galvanized workpiece;
and putting the pretreated galvanized workpiece into the passivation solution for passivation so as to continuously dissolve zinc in the galvanized workpiece and generate a blue-white passivation film.
3. The method according to claim 2, wherein the step of forming the blue-white passivation film comprises:
and drying the blue and white passivation film.
4. The method of claim 2, wherein:
the pH value of the passivation solution is 2.5-3.5.
5. The method of claim 2, wherein:
the passivation time is 30-60 s.
6. The method of claim 2, wherein:
the passivation temperature is 20-40 ℃.
7. The production method according to claim 3, characterized in that:
and the drying time is 5-20 min.
8. The production method according to claim 3, characterized in that:
the drying temperature is 85-180 ℃.
CN202111422395.0A 2021-11-26 2021-11-26 Passivation solution and preparation method of blue-white passivation film Pending CN114107969A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PT72784A (en) * 1980-12-29 1981-05-01 Baltimore Aircoil Co Inc Pretreatment process for galvanized metal prior to its coating with organic powder
US4367099A (en) * 1981-06-15 1983-01-04 Occidental Chemical Corporation Trivalent chromium passivate process
CN101184867A (en) * 2005-05-27 2008-05-21 日本帕卡濑精株式会社 Metal chemical conversion treatment liquid and treatment method
WO2011127473A1 (en) * 2010-04-09 2011-10-13 Enthone Inc. Passivation treatment of zinc-based coatings
WO2012143934A2 (en) * 2011-03-30 2012-10-26 Mahindra & Mahindra Limited Corrosion resistance passivation formulation and process of preparation thereof
CN103046037A (en) * 2012-11-19 2013-04-17 上海应用技术学院 High corrosion resistance trivalent chromium blue and white passivating liquid as well as preparation method and application of blue and white passivating liquid
CN104498923A (en) * 2014-12-26 2015-04-08 湖南金裕化工有限公司 Colorful trivalent chromium passivation liquid, preparation method and use method thereof
CN106756955A (en) * 2016-12-07 2017-05-31 济南德锡科技有限公司 A kind of trivalent blue-white chromating concentrate of highly corrosion resistant and preparation method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PT72784A (en) * 1980-12-29 1981-05-01 Baltimore Aircoil Co Inc Pretreatment process for galvanized metal prior to its coating with organic powder
US4367099A (en) * 1981-06-15 1983-01-04 Occidental Chemical Corporation Trivalent chromium passivate process
CN101184867A (en) * 2005-05-27 2008-05-21 日本帕卡濑精株式会社 Metal chemical conversion treatment liquid and treatment method
WO2011127473A1 (en) * 2010-04-09 2011-10-13 Enthone Inc. Passivation treatment of zinc-based coatings
WO2012143934A2 (en) * 2011-03-30 2012-10-26 Mahindra & Mahindra Limited Corrosion resistance passivation formulation and process of preparation thereof
CN103046037A (en) * 2012-11-19 2013-04-17 上海应用技术学院 High corrosion resistance trivalent chromium blue and white passivating liquid as well as preparation method and application of blue and white passivating liquid
CN104498923A (en) * 2014-12-26 2015-04-08 湖南金裕化工有限公司 Colorful trivalent chromium passivation liquid, preparation method and use method thereof
CN106756955A (en) * 2016-12-07 2017-05-31 济南德锡科技有限公司 A kind of trivalent blue-white chromating concentrate of highly corrosion resistant and preparation method thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
谢和生: "《电镀工问答》", 国防工业出版社, pages: 110 - 111 *
陈春成: ""镀锌层三价铬钝化工艺"，陈春成，第26卷，第2期， 《Plating and Finishing》，第26-29页", 《PLATING AND FINISHING》, vol. 26, no. 2, pages 26 - 29 *

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