CN113088952B - Trivalent chromium passivator for galvanized material and preparation method and use method thereof - Google Patents
Trivalent chromium passivator for galvanized material and preparation method and use method thereof Download PDFInfo
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- CN113088952B CN113088952B CN202110414301.9A CN202110414301A CN113088952B CN 113088952 B CN113088952 B CN 113088952B CN 202110414301 A CN202110414301 A CN 202110414301A CN 113088952 B CN113088952 B CN 113088952B
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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
- C23C22/48—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 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
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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
- C23C22/73—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
Abstract
The invention discloses a trivalent chromium passivator for a zinc-plating material, wherein the volume concentration of trivalent chromium salt in the trivalent chromium passivator is 100-300g/L, the volume concentration of an oxidant is 10-100g/L, the volume concentration of a complexing agent is 10-50g/L, the volume concentration of a film-forming additive is 10-50g/L, the volume concentration of an activating metal salt is 50-200g/L, and the volume concentration of a pH value regulator is 25-90g/L; the pH value of the trivalent chromium passivation solution is 1.5-2.2; the film-forming assistant is alkoxyl ether containing carbon-carbon triple bond. The film-forming assistant with a specific chemical structure is added, so that a bright, uniform, compact and corrosion-resistant colored passivation film is formed on the surface of the galvanized material, hexavalent chromium cannot be generated after the galvanized material is placed for a long time, the film-forming assistant is low in cost and simple to add, and the preparation difficulty and the raw material cost of the trivalent chromium passivator are not basically increased.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a trivalent chromium passivator for a zinc-plated material, and a preparation method and a use method thereof.
Background
The steel material has very wide application in the industries of aviation, traffic, electric power, construction, machinery, military and the like, but is easy to corrode in atmospheric environment. Galvanization on the surface of steel is the most economic and effective method for improving the corrosion resistance of the steel. Zinc belongs to amphoteric metal as a protective layer of steel, has stable property in dry air, but is easy to react with CO in air in a humid environment 2 And O 2 The reaction occurs to generate oxidation products of the basic zinc carbonate, thereby losing the protection capability. Therefore, in order to further improve the corrosion resistance of the workpiece, the surface treatment industry needs to passivate the zinc coating to form iridescent, bluish white, black, golden yellow, army green and other types of passivation films on the surface of the zinc coating, so that the passivation films not only can achieve the decoration effect, but also can improve the corrosion resistance of the zinc coating to different degrees and prolong the service life of the workpiece.
A hexavalent chromium passivating agent is adopted in a traditional passivation process of a galvanized material, and a complex compound generated by hexavalent chromium ions and zinc ions is mainly uniformly covered on the surface of a zinc layer, so that the effect of isolating oxygen and water is achieved, and the corrosion resistance of the galvanized layer is improved. However, hexavalent chromium ions have high toxicity and carcinogenicity, and cause serious environmental pollution, and strict control measures have been established in the european union to limit the use of hexavalent chromium. WEEE (european union directive on scrap electrical and electronic equipment) and ELV (scrap vehicle directive) have required the prohibition of hexavalent chromium in the electrical and electronic fields and the automotive field from 7/1/2006 and 7/1/2007, respectively. From 3/1/2007, hexavalent chromium is prohibited from being contained in electronic and electrical equipment in the market. In this case, trivalent chromium is much less toxic than hexavalent chromium, and its protective properties on the zinc plating surface are similar to those of hexavalent chromium, so that it has received attention from surface treatment workers. A variety of trivalent chromium passivator products are currently available on the market, with corrosion resistance and decorative properties reaching or exceeding those of hexavalent chromium passivators. However, after the workpiece treated by the trivalent chromium passivator is placed for a period of time, hexavalent chromium can be detected in the passivation film, and the content of the hexavalent chromium can gradually increase along with the prolonging of the placing time, which is far beyond the ROHS instruction and the WEEE instruction of European Union regulations, so that the hexavalent chromium passivation method becomes a key problem for preventing the further popularization of the trivalent chromium passivation technology.
Currently, surface treatment workers generally solve the problem of hexavalent chromium generation in trivalent chromium passivation films from three aspects: 1. the method adopts a chromium-free passivation process, namely, adopts a completely chromium-free passivation solution to carry out the surface treatment of electrogalvanizing, and comprises the modes of inorganic matter passivation, organic matter passivation, inorganic matter and organic matter composite passivation and the like, although the chromium-free passivation can fundamentally solve the problem of detecting hexavalent chromium in a passivation film, the chromium-free passivation process in the current market has a considerable gap compared with the quality of a trivalent chromium passivation process in terms of corrosion resistance and decoration; 2. the method comprises the steps of forming an organic film on the surface of a trivalent chromium passivation layer of a zinc plating material by using a sealing agent, wherein the organic film can isolate oxygen in the air from trivalent chromium in the passivation layer so as to prevent the trivalent chromium from being oxidized into hexavalent chromium; 3. the composition of the trivalent chromium passivation solution is optimized, and the generation of hexavalent chromium in the passivation film is inhibited, and both patent CN103695892A and patent CN108004532A adopt special inorganic nanoparticles, such as at least one of titanium dioxide, silicon dioxide and zirconium dioxide, or a compound of fluozirconic acid, fluosilicic acid and chromium oxide nanoparticles, in the trivalent chromium passivation solution.
Disclosure of Invention
In order to solve the problem that hexavalent chromium appears in a trivalent chromium passivation film formed by a trivalent chromium passivator used for a galvanized material in use at present, the invention aims to provide the trivalent chromium passivator used for the galvanized material, which enables the surface of the galvanized material to form a bright, uniform, compact and corrosion-resistant color passivation film by adding a film forming aid with a specific chemical structure, does not generate hexavalent chromium after being placed for a long time, and has low cost and simple addition without basically increasing the configuration difficulty and the raw material cost of the trivalent chromium passivator; therefore, the invention also provides a preparation method and a use method of the trivalent chromium passivator for the galvanized material.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a trivalent chromium passivator for a galvanized material, which comprises a trivalent chromium salt, an oxidant, a complexing agent, a film-forming aid, an activated metal salt, a pH value regulator and deionized water;
wherein the volume concentration of the trivalent chromium salt is 100-300g/L, the volume concentration of the oxidant is 10-100g/L, the volume concentration of the complexing agent is 10-50g/L, the volume concentration of the film forming additive is 10-50g/L, the volume concentration of the activated metal salt is 50-200g/L, and the volume concentration of the pH value regulator is 25-90g/L;
the pH value of the trivalent chromium passivation solution is 1.5-2.2;
the film-forming auxiliary agent is alkoxy ether containing carbon-carbon triple bonds.
Further, the film-forming assistant is one of butynediol diethoxy ether, butynediol dipropoxy ether and propiolic alcohol ethoxy ether.
Preferably, the coalescent is butynediol diethoxy ether.
The alkoxy ether substance has excellent water solubility, permeability and film-forming property, and is beneficial to generating a passivation film on the surface of the galvanized material, meanwhile, an unsaturated carbon-carbon triple bond (C ≡ C) in the structure of the alkoxy ether substance also enters the passivation film, and after the passivation film contacts air, the unsaturated carbon-carbon triple bond preferentially reacts with oxygen to break the unsaturated bond, so that trivalent chromium ions in the passivation film are prevented from being oxidized into hexavalent chromium ions, and the formation of hexavalent chromium in the trivalent chromium passivation film on the surface of the galvanized material is effectively inhibited.
Further, the pH value regulator consists of sodium acetate and formic acid, wherein the volume concentration of the sodium acetate is 20-80g/L, and the volume concentration of the formic acid is 5-10g/L.
Sodium acetate and formic acid are added to adjust and stabilize the pH value of the passivating agent so as to enable the passivating agent to reach the working state of carrying out complex reaction with the galvanized material.
Further, the trivalent chromium salt is one of chromium nitrate, chromium sulfate and chromium chloride.
Preferably, the trivalent chromium salt is chromium nitrate.
Further, the oxidant is sodium nitrate or potassium nitrate.
During passivation, nitrate ions in the oxidant react with zinc on the surface of the galvanized material to oxidize the zinc to generate zinc ions, and meanwhile, the dissolution of the zinc on the surface of the galvanized material causes the pH value of the solution on the surface of the galvanized material to rise, trivalent chromium directly reacts with zinc ions, hydroxyl and the like to form insoluble complex to be deposited on the surface of the galvanized material, and further a passivation film is formed.
Further, the complexing agent is one of ammonium fluoride, fluotitanic acid and fluozirconic acid.
Preferably, the complexing agent is ammonium fluoride.
Ammonium fluoride is used as a complexing agent, so that the permeability of the passivating agent can be increased, the passivating agent can fully react with the surface of a galvanized material, and a complete and uniform passivation film is generated.
Further, the activating metal salt is cobalt sulfate. It can be used mainly for adjusting the appearance color and corrosion resistance of passive film.
Further, the trivalent chromium passivator also comprises 10-100g/L of sodium sulfate. Sodium sulfate is added as a film forming promoter, which is beneficial to trivalent chromium to generate metal complex ions and is beneficial to generating a metal complex passivation film on the surface of the galvanized material.
In a second aspect of the present invention, there is provided a preparation method of the trivalent chromium passivator for a zinc plating material, which is characterized by comprising the following steps:
s1, adding part of deionized water into a reaction vessel, heating to 55-65 ℃, then sequentially adding trivalent chromium salt and activated metal salt, controlling the temperature to rise to 100-110 ℃ while stirring, keeping the temperature at the highest temperature for 5-15min, and stopping heating;
s2, when the temperature of the mixed solution obtained in the step S1 is reduced to 45-55 ℃, sequentially adding an oxidant, a complexing agent, a film forming aid and a pH value regulator into the mixed solution, and uniformly stirring the mixture;
and S3, diluting the mixed solution obtained in the step S2 to a final volume by using the residual deionized water, and continuously stirring uniformly to obtain the trivalent chromium passivator.
The third aspect of the invention provides a use method of the trivalent chromium passivator for the galvanized material, wherein the trivalent chromium passivator is applied to the surface of the galvanized material in an immersion or spraying manner, the passivation temperature is 20-40 ℃, and the passivation time is 1-5min.
Preferably, the trivalent chromium passivator is applied to the surface of the galvanized material in an immersion mode, the passivating treatment temperature is controlled to be 25-35 ℃, and the passivating treatment time is controlled to be 2-4min.
Compared with the prior art, the invention has the following beneficial effects:
the trivalent chromium passivator provided by the invention can form a complete, uniform, bright and compact color passivating film with excellent corrosion resistance on the surface of a galvanized material, and the neutral salt spray resistance experiment of the trivalent chromium passivator can reach more than 100 hours; the trivalent chromium passivator provided by the invention has low raw material cost and simple preparation method, does not need to be doped with special nano particles, and hexavalent chromium ions are not detected in a passivation film after the zinc-plated material is treated by the passivator provided by the invention and is placed for a long time.
Detailed Description
Example 1
The formula of the trivalent chromium passivator for galvanized materials, as shown in table 1,
wherein the trivalent chromium salt is chromium nitrate; the oxidant is sodium nitrate; the complexing agent is ammonium fluoride; the film-forming assistant is butynediol diethoxy ether; the activating metal salt is cobalt sulfate; the pH value regulator consists of sodium acetate and formic acid.
The preparation process of the trivalent chromium passivator for the galvanized material comprises the following steps:
s1, adding part of deionized water into a reaction vessel, heating to 55-65 ℃, then sequentially adding trivalent chromium salt, sodium sulfate and activated metal salt, controlling the temperature to rise to 100-110 ℃ while stirring, keeping the temperature at the highest temperature for 5-15min, and stopping heating; the chromium nitrate, sodium sulfate and cobalt sulfate are continuously stirred at a temperature of more than 100 ℃ to generate metal complex ions, which is helpful for generating a metal complex passivation film on the surface of the galvanized material.
S2, when the temperature of the mixed solution obtained in the step S1 is reduced to 45-55 ℃, sequentially adding an oxidant, a complexing agent, a film forming aid and sodium acetate into the mixed solution, and uniformly stirring the mixture;
s3, when the mixed solution obtained in the step S2 is cooled to room temperature, adding formic acid, and uniformly stirring;
and S4, diluting the mixed solution obtained in the step S3 to a final volume by using the residual deionized water, and continuously stirring uniformly to obtain the trivalent chromium passivator with the pH value of 1.5-2.2.
The galvanized sheet is passivated by the prepared passivating agent, and the specific treatment process is as follows:
the trivalent chromium passivator is acted on the surface of the galvanized plate in an immersion mode, the passivation treatment temperature is controlled at 30 ℃, the passivation treatment time is controlled at 3min, and then the galvanized plate is taken out, washed and dried to form a bright, uniform, compact and corrosion-resistant color passivation film on the surface of the galvanized plate.
Example 2
The formula of the trivalent chromium passivator for galvanized materials is shown in table 1,
wherein the trivalent chromium salt is chromium nitrate; the oxidant is sodium nitrate; the complexing agent is ammonium fluoride; the film-forming assistant is butynediol dipropoxy ether; the activating metal salt is cobalt sulfate; the pH value regulator consists of sodium acetate and formic acid.
The preparation process of the trivalent chromium passivator for a galvanized material is the same as in example 1.
The trivalent chromium passivator is acted on the surface of the galvanized plate in an immersion mode, the passivation treatment temperature is controlled at 35 ℃, the passivation treatment time is controlled at 2min, and then the galvanized plate is taken out, washed and dried to form a bright, uniform, compact and corrosion-resistant color passivation film on the surface of the galvanized plate.
Example 3
The formula of the trivalent chromium passivator for galvanized materials, as shown in table 1,
in the embodiment, sodium sulfate is not added, and the trivalent chromium salt is chromium sulfate; the oxidant is sodium nitrate; the complexing agent is ammonium fluoride; the film-forming auxiliary agent is propargyl alcohol ethoxy ether; the activating metal salt is cobalt sulfate; the pH value regulator consists of sodium acetate and formic acid.
The trivalent chromium passivator for a zinc plated material was prepared in the same manner as in example 1.
The trivalent chromium passivator is acted on the surface of the galvanized plate in an immersion mode, the passivation treatment temperature is controlled at 25 ℃, the passivation treatment time is controlled at 4min, and then the galvanized plate is taken out, washed and dried to form a bright, uniform, compact and corrosion-resistant color passivation film on the surface of the galvanized plate.
Example 4
The formula of the trivalent chromium passivator for galvanized materials is shown in table 1,
wherein the trivalent chromium salt is chromium chloride; the oxidant is potassium nitrate; the complexing agent is fluotitanic acid; the film-forming assistant is butynediol diethoxy ether; the activating metal salt is cobalt sulfate; the pH value regulator consists of sodium acetate and formic acid.
The preparation process of the trivalent chromium passivator for a galvanized material is the same as in example 1.
The trivalent chromium passivator is applied to the surface of the galvanized plate in an immersion mode, the passivating treatment temperature is controlled at 40 ℃, the passivating treatment time is controlled at 1min, and then the galvanized plate is taken out, washed and dried to form a bright, uniform, compact and corrosion-resistant colored passivating film on the surface of the galvanized plate.
Example 5
The formula of the trivalent chromium passivator for galvanized materials, as shown in table 1,
wherein the trivalent chromium salt is chromium nitrate; the oxidant is potassium nitrate; the complexing agent is fluozirconic acid; the film-forming assistant is butynediol dipropoxy ether; the activating metal salt is cobalt sulfate; the pH value regulator consists of sodium acetate and formic acid.
The preparation process of the trivalent chromium passivator for a galvanized material is the same as in example 1.
The trivalent chromium passivator is applied to the surface of the galvanized plate in an immersion mode, the passivating treatment temperature is controlled at 20 ℃, the passivating treatment time is controlled at 5min, and then the galvanized plate is taken out, washed and dried to form a bright, uniform, compact and corrosion-resistant colored passivating film on the surface of the galvanized plate.
Comparative example 1
Comparative example 1 is a comparative experiment example of example 1, in comparative example 1, no film-forming aid is added, the rest components and the proportion are the same as those of example 1, and the preparation method and the using method of the passivation solution are the same as those of example 1.
TABLE 1
The galvanized sheets treated by the passivation solutions prepared in the examples 1 to 5 and the comparative example 1 were subjected to a corrosion resistance salt spray test and a hexavalent chromium precipitation test, and specific test results are shown in tables 2 and 3, respectively.
The 5% NaCl neutral salt spray test (NSS) assay was carried out according to GB/T10125-1997 Artificial atmosphere Corrosion test, under the following conditions: 5 percent of NaCl, the pH value is 6.8-7.2, the temperature in the spray box is 33-37 ℃, the sample forms 15-30 degrees with the vertical direction, the spraying is continuously carried out, the corrosion condition of the passivation piece is regularly observed, and the time for starting to generate white rust is recorded so as to judge the corrosion resistance of the passivation film.
The galvanized sheets treated by the passivation solution prepared in the examples 1-5 and the comparative example 1 are placed for different time, and the IEC63123 boiling water method is adopted to determine the content of hexavalent chromium in the passivation film of the galvanized sheets, and the specific method comprises the following steps: taking a surface area of 50cm 2 The galvanized plate is placed in a beaker, 25mL of pure water is added to immerse the galvanized plate, the pH value is adjusted by 10% of sodium hydroxide, the beaker is placed on an electric hot plate to be heated and boiled, then the temperature is kept for 3-4 minutes, the immersion liquid is transferred to a 50mL volumetric flask, meanwhile, 10mL of pure water is taken to clean the beaker, the cleaning liquid is also transferred to the 50mL volumetric flask to be mixed with the immersion liquid, 2mL of 10% nitric acid is added, and the pH value of the solution is adjusted; adding 2mL of phosphate buffer solution, stirring uniformly, adding 2mL of color development solution (0.4 g of diphenylcarbazide is dissolved in a mixed solution of 20 mL of acetone and 20 mL of ethanol), then fixing the volume to a scale by pure water, standing for 5L for 10 minutes to fully develop the color, and determining the absorbance of chromium at the wavelength of 540nm, wherein the hexavalent chromium concentration exceeds the detection limit of the method by 0.02mg/L, and the hexavalent chromium concentration exceeds 0.02mg/L, namely the detection is positive.
TABLE 2
TABLE 3
As can be seen from the items in Table 2, the trivalent chromium passivators prepared in examples 1 to 5 can obviously improve the corrosion resistance of a zinc coating, and the time for the nickel-zinc plating layer to generate white rust is over 100 hours by using a GB/T10125-1997 neutral salt spray test of Artificial atmosphere Corrosion experiments.
As can be seen from the items in Table 3, after the galvanized sheet is treated by the trivalent chromium passivator provided by the invention, the galvanized sheet is placed for 3-60 days, and the hexavalent chromium content is not detected by adopting the IEC63123 boiling water method for measuring the hexavalent chromium, while in comparative example 1, the hexavalent chromium ion content is positive after the passive film is placed for more than 10 days because no film-forming assistant is added.
In conclusion, the trivalent chromium passivator provided by the invention can form a complete, uniform, bright and compact colored passivation film with excellent corrosion resistance on the surface of a galvanized material, and the neutral salt spray resistance experiment of the passivation film can reach more than 100 hours; the trivalent chromium passivator provided by the invention has low raw material cost and simple preparation method, does not need to be doped with special nano particles, and hexavalent chromium ions are not detected in a passivation film after the zinc-plated material is treated by the passivator provided by the invention and is placed for a long time.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. Numerous simple deductions, modifications or substitutions may also be made by those skilled in the art in light of the present teachings.
Claims (4)
1. The trivalent chromium passivator for the galvanized material is characterized by comprising trivalent chromium salt, an oxidant, a complexing agent, a film forming aid, an activated metal salt, a pH value regulator and deionized water;
wherein the concentration of trivalent chromium salt is 100-300g/L, the concentration of oxidant is 10-100g/L, the concentration of complexing agent is 10-50g/L, the concentration of film-forming aid is 10-50g/L, the concentration of activated metal salt is 50-200g/L, and the concentration of pH value regulator is 25-90g/L;
the pH value of the trivalent chromium passivation solution is 1.5-2.2;
the film-forming auxiliary agent is alkoxy ether containing carbon-carbon triple bonds, and the alkoxy ether containing the carbon-carbon triple bonds is one of butynediol diethoxy ether, butynediol dipropoxy ether and propiolic alcohol ethoxy ether;
the pH value regulator consists of sodium acetate and formic acid, wherein the concentration of the sodium acetate is 20-80g/L, and the concentration of the formic acid is 5-10g/L;
the trivalent chromium salt is one of chromium nitrate, chromium sulfate and chromium chloride;
the oxidant is sodium nitrate or potassium nitrate;
the complexing agent is one of ammonium fluoride, fluotitanic acid and fluozirconic acid;
the activating metal salt is cobalt sulfate.
2. The trivalent chromium passivator for zinc plated material according to claim 1 further comprising sodium sulfate 10-100g/L.
3. A method for preparing a trivalent chromium passivator for zinc coated materials according to claim 1 comprising the steps of:
s1, adding part of deionized water into a reaction vessel, heating to 55-65 ℃, sequentially adding trivalent chromium salt and activated metal salt into the reaction vessel, controlling the temperature to rise to 100-110 ℃ while stirring, keeping the temperature at the highest temperature for 5-15min, and stopping heating;
s2, when the temperature of the mixed solution obtained in the step S1 is reduced to 45-55 ℃, sequentially adding an oxidant, a complexing agent, a film forming aid and a pH value regulator into the mixed solution, and uniformly stirring the mixture;
and S3, diluting the mixed solution obtained in the step S2 to a final volume by using the residual deionized water, and continuously stirring uniformly to obtain the trivalent chromium passivator.
4. The use method of the trivalent chromium passivator for a zinc plating material according to claim 1, characterized in that the trivalent chromium passivator is applied to the surface of the zinc plating material by immersion or spraying, the passivation temperature is 20-40 ℃, and the passivation time is 1-5min.
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| CN108914106A (en) * | 2018-06-08 | 2018-11-30 | 浙江工业大学 | A kind of galvanized sheet surface passivation filling treatment fluid and its application certainly |
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