CN112126919A - Passivation method of aluminum hexavalent chromium passivator - Google Patents
Passivation method of aluminum hexavalent chromium passivator Download PDFInfo
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- CN112126919A CN112126919A CN202010856318.5A CN202010856318A CN112126919A CN 112126919 A CN112126919 A CN 112126919A CN 202010856318 A CN202010856318 A CN 202010856318A CN 112126919 A CN112126919 A CN 112126919A
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- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 63
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000002161 passivation Methods 0.000 title claims description 18
- 239000000463 material Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000008139 complexing agent Substances 0.000 claims abstract description 11
- 239000000314 lubricant Substances 0.000 claims abstract description 11
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 11
- 239000007800 oxidant agent Substances 0.000 claims abstract description 11
- 229920003023 plastic Polymers 0.000 claims abstract description 7
- 239000004033 plastic Substances 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000000243 solution Substances 0.000 claims description 40
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 15
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 239000011651 chromium Substances 0.000 claims description 10
- PHFQLYPOURZARY-UHFFFAOYSA-N chromium trinitrate Chemical compound [Cr+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PHFQLYPOURZARY-UHFFFAOYSA-N 0.000 claims description 10
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 10
- 239000011734 sodium Substances 0.000 claims description 10
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 10
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 238000005254 chromizing Methods 0.000 claims description 9
- 238000004448 titration Methods 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 5
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 claims description 5
- 229910021555 Chromium Chloride Inorganic materials 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 5
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 5
- 229920002472 Starch Polymers 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 230000003213 activating effect Effects 0.000 claims description 5
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- QSWDMMVNRMROPK-UHFFFAOYSA-K chromium(3+) trichloride Chemical compound [Cl-].[Cl-].[Cl-].[Cr+3] QSWDMMVNRMROPK-UHFFFAOYSA-K 0.000 claims description 5
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 claims description 5
- 235000015165 citric acid Nutrition 0.000 claims description 5
- 239000012459 cleaning agent Substances 0.000 claims description 5
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- 238000005202 decontamination Methods 0.000 claims description 5
- 230000003588 decontaminative effect Effects 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- -1 molybdenum metals Chemical class 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- 235000006408 oxalic acid Nutrition 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 5
- 239000004800 polyvinyl chloride Substances 0.000 claims description 5
- 235000010333 potassium nitrate Nutrition 0.000 claims description 5
- 239000004323 potassium nitrate Substances 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 235000013024 sodium fluoride Nutrition 0.000 claims description 5
- 239000011775 sodium fluoride Substances 0.000 claims description 5
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 5
- 235000010344 sodium nitrate Nutrition 0.000 claims description 5
- 239000004317 sodium nitrate Substances 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- 239000012224 working solution Substances 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims 1
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 5
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 abstract description 2
- 239000003973 paint Substances 0.000 abstract description 2
- 239000011241 protective layer Substances 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 8
- 238000007865 diluting Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 238000005536 corrosion prevention Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 238000010587 phase diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- DGOBMKYRQHEFGQ-UHFFFAOYSA-L acid green 5 Chemical compound [Na+].[Na+].C=1C=C(C(=C2C=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C=2C=CC(=CC=2)S([O-])(=O)=O)C=CC=1N(CC)CC1=CC=CC(S([O-])(=O)=O)=C1 DGOBMKYRQHEFGQ-UHFFFAOYSA-L 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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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
- C23C22/24—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 hexavalent chromium compounds
- C23C22/26—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 hexavalent chromium compounds containing also organic compounds
- C23C22/27—Acids
-
- 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
- C23C22/24—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 hexavalent chromium compounds
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention provides an aluminum hexavalent chromium passivator which is prepared from the following raw materials in parts by mass: 80-100 parts of hexavalent chromium salt, 40-50 parts of oxidizing agent, 15-25 parts of complexing agent, 10-20 parts of activated metal ions, 1-5 parts of lubricant and 200 parts of water. The invention has the advantages that the aluminum alloy surface protective layer prepared by the method can lead the surface of aluminum and aluminum alloy to be chromated, can form a yellow to iridescent chromate film layer (0.1-2.1g/m2) on the surface of aluminum material, has excellent anti-corrosion performance, and can greatly improve the adhesive force between a workpiece and paint or a plastic spraying coating.
Description
Technical Field
The invention relates to the technical field of aluminum product treatment, in particular to a passivation method of an aluminum product hexavalent chromium passivator.
Background
Articles made of aluminum and other alloying elements. Usually, the steel is processed into casting products, forging products, foils, plates, strips, pipes, bars, section bars and the like, and then the steel is manufactured by the processes of cold bending, saw cutting, drilling, assembling, coloring and the like. The main metal element is aluminum, and some alloy elements are added to improve the performance of the aluminum material. Aluminum is one of the most important non-ferrous metal varieties. Pure aluminum and aluminum alloys have become important base materials for household appliances because of their good properties (low density, good plasticity and formability) and their easy recycling. The method is widely used for reproducing components such as heating elements, conductive elements and the like of household appliances. The recycling of the scrap aluminum becomes the most important part of the recycling of the nonferrous metals, and the energy consumption, the recycling cost and the like of the scrap aluminum are much lower (about 10 percent) than those of the original aluminum.
When the aluminum product hexavalent chromium passivator is attached to the surface of an aluminum product, the protection effect is poor, so that the service life of the aluminum product is shortened, and the use effect is poor.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a passivation method of an aluminum hexavalent chromium passivator.
The invention solves the technical problems through the following technical means:
the aluminum hexavalent chromium passivator comprises the following raw materials in parts by mass: 80-100 parts of hexavalent chromium salt, 40-50 parts of oxidizing agent, 15-25 parts of complexing agent, 10-20 parts of activated metal ions, 1-5 parts of lubricant and 200 parts of water;
the hexavalent chromium salt is one of chromium sulfate, chromium nitrate and chromium chloride;
the oxidant is one of sodium nitrate, potassium nitrate and nitric acid;
the complexing agent is one of oxalic acid, citric acid, sodium fluoride, ammonium fluoride and ammonium bifluoride;
the activating metal ions are a mixture of cobalt, nickel and molybdenum metals;
one of lubricant sodium dodecyl sulfate and sodium bisulfite.
A passivation method of an aluminum hexavalent chromium passivator comprises the following steps:
s1, preparing a tank solution for the first time:
s1.1, placing a 1000L placing tank, adding 1/2 g of water into the tank, adding 15kg of hexavalent chromium passivator prepared in claim 1, adding water to 1000L, and stirring;
s1.2, sampling and detecting Cr6+Concentration and pH;
s2, primary adjustment of bath solution: adjusting Cr6+(point) 6-18 parts, the PH value is 1.8-2.2, and the treatment temperature is 20-30 ℃;
s3, passivating the aluminum material: putting the aluminum material into a 1000L placing groove for passivation reaction;
s4, secondary adjustment of tank liquor: with followingThe continuous operation, the concentration of the bath solution is gradually reduced (the pH value is increased), and the abnormal phenomenon occurs in chromizing; timely adding the hexavalent chromium passivator prepared in claim 1, and adding 2.5kg of the hexavalent chromium passivator to improve the Cr content6+1 point. .
Preferably, the Cr is6+The concentration is detected by a titration method:
transferring 10 ml of the working solution into a conical flask by using a pipette, and diluting with 50 ml of distilled water; 20 ml of 25% H is added2SO4Adding 2-3 g of KI, and standing for 1-2 minutes; slowly add 0.1N Na under continuous stirring2S2O3Titrating until the solution turns from brown to yellow; 1-2 ml of 1% starch solution was added, and the titration was continued until the solution turned from black to light green, using 0.1N Na2S2O3The milliliter number of the solution is Cr6+The number of points.
Preferably, the trough body, the hooks and the basket are made of polyvinyl chloride plastic or austenitic stainless steel.
Preferably, in S3, all the dirt on the surface of the aluminum material needs to be removed before chromizing the aluminum material.
Preferably, the surface decontamination of the aluminum material adopts Hetal cleaner201 cleaning agent or Pre-dips 504 gloss agent.
The invention has the advantages that: the aluminum alloy surface protective layer prepared by the method can lead the surface of aluminum and aluminum alloy to be chromated, can form a yellow to iridescent chromate film layer (0.1-2.1g/m2) on the surface of aluminum, has excellent anti-corrosion performance, and can greatly improve the adhesive force between a workpiece and paint or a plastic spraying coating.
Drawings
FIG. 1 is a schematic view of a metallographic picture according to example 1 of the present invention;
FIG. 2 is a schematic view of a metallographic picture according to example 2 of the present invention;
FIG. 3 is a schematic diagram of a golden phase in example 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all 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.
Example 1
The aluminum hexavalent chromium passivator comprises the following raw materials in parts by mass: 80 parts of hexavalent chromium salt, 40 parts of oxidizing agent, 15 parts of complexing agent, 10 parts of activated metal ions, 1 part of lubricant and 200 parts of water;
the hexavalent chromium salt is one of chromium sulfate, chromium nitrate and chromium chloride;
the oxidant is one of sodium nitrate, potassium nitrate and nitric acid;
the complexing agent is one of oxalic acid, citric acid, sodium fluoride, ammonium fluoride and ammonium bifluoride;
the activating metal ions are a mixture of cobalt, nickel and molybdenum metals;
one of lubricant sodium dodecyl sulfate and sodium bisulfite.
A passivation method of an aluminum hexavalent chromium passivator comprises the following steps:
s1, preparing a tank solution for the first time:
s1.1, placing a 1000L placing tank, adding 1/2 g of water into the tank, adding 15kg of hexavalent chromium passivator prepared in claim 1, adding water to 1000L, and stirring;
s1.2, sampling and detecting Cr6+Concentration and pH;
s2, primary adjustment of bath solution: adjusting Cr6+(point) 6-18 parts, the PH value is 1.8-2.2, and the treatment temperature is 20-30 ℃;
s3, passivating the aluminum material: putting the aluminum material into a 1000L placing groove for passivation reaction;
s4, secondary adjustment of tank liquor: along with continuous work, the concentration of the bath solution is gradually reduced (the pH value is increased), and abnormal phenomena occur in chromizing; timely adding the hexavalent chromium passivator prepared in claim 1, and adding 2.5kg of the hexavalent chromium passivator to improve the Cr content6+1 point.
The Cr is6+The concentration is detected by a titration method:
transferring 10 ml of the working solution into a conical flask by using a pipette, and diluting with 50 ml of distilled water; 20 ml of 25% H is added2SO4Adding 2-3 g of KI, and standing for 1-2 minutes; slowly add 0.1N Na under continuous stirring2S2O3Titrating until the solution turns from brown to yellow; 1-2 ml of 1% starch solution was added, and the titration was continued until the solution turned from black to light green, using 0.1N Na2S2O3The milliliter number of the solution is Cr6+The number of points.
The trough body, the hooks and the basket are made of polyvinyl chloride plastic or austenitic stainless steel.
And in the S3, all dirt on the surface of the aluminum material needs to be removed before the aluminum material is chromized.
The surface decontamination of the aluminum material adopts Hetal cleaner201 cleaning agent or Pre-dips 504 polishing agent.
The hexavalent chromium passivator prepared by the proportion has stable aluminum chromizing effect and good corrosion prevention effect, and is detailed in a gold phase diagram shown in figure 1.
Example 2
The aluminum hexavalent chromium passivator comprises the following raw materials in parts by mass: 100 parts of hexavalent chromium salt, 50 parts of oxidizing agent, 25 parts of complexing agent, 20 parts of activated metal ions, 5 parts of lubricant and 200 parts of water;
the hexavalent chromium salt is one of chromium sulfate, chromium nitrate and chromium chloride;
the oxidant is one of sodium nitrate, potassium nitrate and nitric acid;
the complexing agent is one of oxalic acid, citric acid, sodium fluoride, ammonium fluoride and ammonium bifluoride;
the activating metal ions are a mixture of cobalt, nickel and molybdenum metals;
one of lubricant sodium dodecyl sulfate and sodium bisulfite.
A passivation method of an aluminum hexavalent chromium passivator comprises the following steps:
s1, preparing a tank solution for the first time:
s1.1, placing a 1000L placing tank, adding 1/2 g of water into the tank, adding 15kg of hexavalent chromium passivator prepared in claim 1, adding water to 1000L, and stirring;
s1.2, sampling and detecting Cr6+Concentration and pH;
s2, primary adjustment of bath solution: adjusting Cr6+(point) 6-18 parts, the PH value is 1.8-2.2, and the treatment temperature is 20-30 ℃;
s3, passivating the aluminum material: putting the aluminum material into a 1000L placing groove for passivation reaction;
s4, secondary adjustment of tank liquor: along with continuous work, the concentration of the bath solution is gradually reduced (the pH value is increased), and abnormal phenomena occur in chromizing; timely adding the hexavalent chromium passivator prepared in claim 1, and adding 2.5kg of the hexavalent chromium passivator to improve the Cr content6+1 point.
The Cr is6+The concentration is detected by a titration method:
transferring 10 ml of the working solution into a conical flask by using a pipette, and diluting with 50 ml of distilled water; 20 ml of 25% H is added2SO4Adding 2-3 g of KI, and standing for 1-2 minutes; slowly add 0.1N Na under continuous stirring2S2O3Titrating until the solution turns from brown to yellow; 1-2 ml of 1% starch solution was added, and the titration was continued until the solution turned from black to light green, using 0.1N Na2S2O3The milliliter number of the solution is Cr6+The number of points.
The trough body, the hooks and the basket are made of polyvinyl chloride plastic or austenitic stainless steel.
And in the S3, all dirt on the surface of the aluminum material needs to be removed before the aluminum material is chromized.
The surface decontamination of the aluminum material adopts Hetal cleaner201 cleaning agent or Pre-dips 504 polishing agent.
The hexavalent chromium passivator prepared by the proportion has stable aluminum chromizing effect and good corrosion prevention effect, and is detailed in a gold phase diagram of figure 2
Example 3.
The aluminum hexavalent chromium passivator comprises the following raw materials in parts by mass: 90 parts of hexavalent chromium salt, 45 parts of oxidizing agent, 20 parts of complexing agent, 15 parts of activated metal ions, 2.5 parts of lubricating agent and 200 parts of water;
the hexavalent chromium salt is one of chromium sulfate, chromium nitrate and chromium chloride;
the oxidant is one of sodium nitrate, potassium nitrate and nitric acid;
the complexing agent is one of oxalic acid, citric acid, sodium fluoride, ammonium fluoride and ammonium bifluoride;
the activating metal ions are a mixture of cobalt, nickel and molybdenum metals;
one of lubricant sodium dodecyl sulfate and sodium bisulfite.
A passivation method of an aluminum hexavalent chromium passivator comprises the following steps:
s1, preparing a tank solution for the first time:
s1.1, placing a 1000L placing tank, adding 1/2 g of water into the tank, adding 15kg of hexavalent chromium passivator prepared in claim 1, adding water to 1000L, and stirring;
s1.2, sampling and detecting Cr6+Concentration and pH;
s2, primary adjustment of bath solution: adjusting Cr6+(point) 6-18 parts, the PH value is 1.8-2.2, and the treatment temperature is 20-30 ℃;
s3, passivating the aluminum material: putting the aluminum material into a 1000L placing groove for passivation reaction;
s4, secondary adjustment of tank liquor: along with continuous work, the concentration of the bath solution is gradually reduced (the pH value is increased), and abnormal phenomena occur in chromizing; timely adding the hexavalent chromium passivator prepared in claim 1, and adding 2.5kg of the hexavalent chromium passivator to improve the Cr content6+1 point.
The Cr is6+The concentration is detected by a titration method:
transferring 10 ml of the working solution into a conical flask by using a pipette, and diluting with 50 ml of distilled water; 20 ml of 25% H is added2SO4Adding 2-3 g of KI, and standing for 1-2 minutes; slowly add 0.1N Na under continuous stirring2S2O3Titrating until the solution turns from brown to yellow; adding 1-2 ml of 1% starch solution, and continuously titrating until the solution turns from black to lightGreen, 0.1N Na used2S2O3The milliliter number of the solution is Cr6+The number of points.
The trough body, the hooks and the basket are made of polyvinyl chloride plastic or austenitic stainless steel.
And in the S3, all dirt on the surface of the aluminum material needs to be removed before the aluminum material is chromized.
The surface decontamination of the aluminum material adopts Hetal cleaner201 cleaning agent or Pre-dips 504 polishing agent.
The hexavalent chromium passivator prepared by the proportion has stable aluminum chromizing effect and good corrosion prevention effect, and is detailed in a gold phase diagram shown in figure 3
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
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 (6)
1. An aluminum hexavalent chromium passivator is characterized in that: the composite material is prepared from the following raw materials in parts by mass: 80-100 parts of hexavalent chromium salt, 40-50 parts of oxidizing agent, 15-25 parts of complexing agent, 10-20 parts of activated metal ions, 1-5 parts of lubricant and 200 parts of water;
the hexavalent chromium salt is one of chromium sulfate, chromium nitrate and chromium chloride;
the oxidant is one of sodium nitrate, potassium nitrate and nitric acid;
the complexing agent is one of oxalic acid, citric acid, sodium fluoride, ammonium fluoride and ammonium bifluoride;
the activating metal ions are a mixture of cobalt, nickel and molybdenum metals;
one of lubricant sodium dodecyl sulfate and sodium bisulfite.
2. The passivation method of the aluminum hexavalent chromium passivator of claim 1, characterized in that: the method comprises the following steps:
s1, preparing a tank solution for the first time:
s1.1, placing a 1000L placing tank, adding 1/2 g of water into the tank, adding 15kg of hexavalent chromium passivator prepared in claim 1, adding water to 1000L, and stirring;
s1.2, sampling and detecting Cr6+Concentration and pH;
s2, primary adjustment of bath solution: adjusting Cr6+(point) 6-18 parts, the PH value is 1.8-2.2, and the treatment temperature is 20-30 ℃;
s3, passivating the aluminum material: putting the aluminum material into a 1000L placing groove for passivation reaction;
s4, secondary adjustment of tank liquor: along with continuous work, the concentration of the bath solution is gradually reduced (the pH value is increased), and abnormal phenomena occur in chromizing; timely adding the hexavalent chromium passivator prepared in claim 1, and adding 2.5kg of the hexavalent chromium passivator to improve the Cr content6+1 point.
3. The passivation method of the aluminum hexavalent chromium passivator of claim 2, characterized in that: the Cr is6+The concentration is detected by a titration method:
pipette 10 ml of working solution into a conical flaskDiluting with 50 ml of distilled water; 20 ml of 25% H is added2SO4Adding 2-3 g of KI, and standing for 1-2 minutes; slowly add 0.1N Na under continuous stirring2S2O3Titrating until the solution turns from brown to yellow; 1-2 ml of 1% starch solution was added, and the titration was continued until the solution turned from black to light green, using 0.1N Na2S2O3The milliliter number of the solution is Cr6+The number of points.
4. The passivation method of the aluminum hexavalent chromium passivator of claim 2, characterized in that: the trough body, the hooks and the basket are made of polyvinyl chloride plastic or austenitic stainless steel.
5. The passivation method of the aluminum hexavalent chromium passivator of claim 2, characterized in that: and in the S3, all dirt on the surface of the aluminum material needs to be removed before the aluminum material is chromized.
6. The passivation method of aluminum hexavalent chromium passivator according to claim 5, characterized in that: the surface decontamination of the aluminum material adopts Hetal cleaner201 cleaning agent or Pre-dips 504 polishing agent.
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| CN113201730A (en) * | 2021-05-08 | 2021-08-03 | 遵义智通金属表面技术处理有限公司 | Automatic line galvanizing color passivation method |
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