CN113201730A - Automatic line galvanizing color passivation method - Google Patents
Automatic line galvanizing color passivation method Download PDFInfo
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- CN113201730A CN113201730A CN202110501706.6A CN202110501706A CN113201730A CN 113201730 A CN113201730 A CN 113201730A CN 202110501706 A CN202110501706 A CN 202110501706A CN 113201730 A CN113201730 A CN 113201730A
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- 238000002161 passivation Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005246 galvanizing Methods 0.000 title claims abstract description 15
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 150000003839 salts Chemical class 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 239000007800 oxidant agent Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000008139 complexing agent Substances 0.000 claims abstract description 10
- 239000003112 inhibitor Substances 0.000 claims abstract description 10
- 239000000080 wetting agent Substances 0.000 claims abstract description 10
- 239000008367 deionised water Substances 0.000 claims abstract description 9
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 9
- 230000001590 oxidative effect Effects 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000004615 ingredient Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 7
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 6
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 claims description 4
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 4
- OZECDDHOAMNMQI-UHFFFAOYSA-H cerium(3+);trisulfate Chemical compound [Ce+3].[Ce+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O OZECDDHOAMNMQI-UHFFFAOYSA-H 0.000 claims description 4
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 claims description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 4
- RYYXDZDBXNUPOG-UHFFFAOYSA-N 4,5,6,7-tetrahydro-1,3-benzothiazole-2,6-diamine;dihydrochloride Chemical compound Cl.Cl.C1C(N)CCC2=C1SC(N)=N2 RYYXDZDBXNUPOG-UHFFFAOYSA-N 0.000 claims description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- 150000002191 fatty alcohols Chemical class 0.000 claims description 3
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 3
- 239000011976 maleic acid Substances 0.000 claims description 3
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims description 3
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims description 3
- -1 polyoxyethylene Polymers 0.000 claims description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 3
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 235000010265 sodium sulphite Nutrition 0.000 claims description 3
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 3
- 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 2
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 2
- 229910000361 cobalt sulfate Inorganic materials 0.000 claims description 2
- 229940044175 cobalt sulfate Drugs 0.000 claims description 2
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 claims description 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000012286 potassium permanganate Substances 0.000 claims description 2
- LJCNRYVRMXRIQR-OLXYHTOASA-L potassium sodium L-tartrate Chemical compound [Na+].[K+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O LJCNRYVRMXRIQR-OLXYHTOASA-L 0.000 claims description 2
- 229940074439 potassium sodium tartrate Drugs 0.000 claims description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 2
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 2
- 235000011006 sodium potassium tartrate Nutrition 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052804 chromium Inorganic materials 0.000 abstract description 11
- 239000011651 chromium Substances 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 abstract description 3
- 229910017604 nitric acid Inorganic materials 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 10
- 229910052725 zinc Inorganic materials 0.000 description 10
- 239000011701 zinc Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 5
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000007744 chromate conversion coating Methods 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007739 conversion coating Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 231100000584 environmental toxicity Toxicity 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 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
- C23C22/28—Macromolecular compounds
-
- 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
- C23C22/34—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
- C23C22/37—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 containing also hexavalent chromium compounds
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
Abstract
The invention discloses an automatic line galvanizing color passivation method, belonging to the galvanizing color passivation field, the existing galvanizing layer color passivation is a color film layer obtained by chromic anhydride, sulfuric acid and nitric acid, only manual production can be carried out, an automatic production line can not obtain qualified passivation film layers, such as mottling, film layer inconsistency of upper and lower parts, even partial bottom exposure, the invention adds chromic anhydride (CrO)3) The raw materials of the metal salt, the complexing agent, the film forming accelerant, the oxidant, the wetting agent, the inhibitor and the deionized water are matched, the rationality of the selection of the galvanized trivalent chromium color passivator material is enhanced, the degree of engagement among the galvanized trivalent chromium color passivator materials is also improved, the reaction effect among various ingredients is improved, and the zinc-plated trivalent chromium color passivator material can be solvedThe automatic production line is solved, the problems of the traditional formula in the automatic production line, such as mottling, flow marks and exposed bottom, are solved, and the automatic production line is completely customized.
Description
Technical Field
The invention relates to the field of zinc-plating color passivation, in particular to an automatic line zinc-plating color passivation method.
Background
Zinc is an active metal, and if zinc is not well post-treated after electroplating, the coating quickly becomes dark, and white corrosion products are generated successively. To reduce the chemical activity of zinc, chromate solutions are often used for passivation to form a chromate conversion coating on the surface of the zinc layer.
In the prior art, in the formula of color passivation, passivation solution is always acidic. In an acidic medium, the zinc layer reacts chemically with it. The main reactions here are the oxidation and reduction reactions between the metallic zinc coating and the chromic acid in the passivating solution. Zinc acts as a reducing agent and chromic acid, which acts as an oxidizing agent, is reduced to trivalent chromium. The passive film is actually a compound obtained by oxidation-reduction reaction of trivalent chromium and hexavalent chromium with zinc. However, the carcinogenicity and environmental toxicity of hexavalent chromium have greatly limited its use, and european union directive 2000/53/EC (european union directive on scrapping automobiles) has limited the use of hexavalent chromium conversion coatings. Therefore, the current passivation of color zinc plating gradually moves to trivalent chromium passivation or chromium-free passivation. However, the effect of chromium-free passivation, particularly as a color chromium-free passivation, in the prior art studies is far less than that of chromium-containing passivation, and thus trivalent chromium color passivation has received much attention.
Disclosure of Invention
The invention provides a passivation method for automatic line galvanizing color, which aims to solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
an automatic line galvanizing color passivation method comprises the following steps:
s1, accurately weighing the following materials in parts by weight: chromic anhydride (CrO)3): 80-100 parts of metal salt: 10-20 parts of complexing agent: 5-20 parts of a film forming promoter: 5-20 parts of an oxidant: 20-50 parts of wetting agent: 1-5 parts of inhibitor: 1-3 parts and 220 parts of deionized water 110-;
s2, adding deionized water into the reaction vessel in advance, heating to a preset temperature, and then adding chromic anhydride (CrO) into the reaction vessel3) Stirring the mixture evenly, continuously stirring the mixture after the mixture is stirred evenly, and adding metal salt;
s3, after the temperature in the reaction container is reduced, sequentially adding a complexing agent, a film forming promoter, an oxidant, a wetting agent, an inhibitor and deionized water into the reaction container, fully stirring all ingredients in the reaction container, and after the ingredient solution in the reaction container is uniformly stirred, obtaining the zinc-plated color passivator solution.
Preferably, in S2, the stirring time is 10-15min after the stirring is uniform, and the reaction temperature of the reaction vessel during the feeding process is controlled within the range of 55-70 ℃.
Preferably, the oxidant is one or more of potassium chlorate, sodium hypochlorite, peroxyacetic acid and potassium permanganate.
Preferably, the complexing agent is one or more of citric acid, maleic acid, malonic acid, ammonium bifluoride and potassium sodium tartrate.
Preferably, the film forming promoter is sodium sulfate.
Preferably, the wetting agent is one or more of alkylphenol polyoxyethylene, fatty alcohol polyoxyethylene and sodium dodecyl benzene sulfonate; the inhibitor is at least one of sodium sulfite, sodium bisulfite and thiourea dioxide
Preferably, the metal salt is one or more of cobalt sulfate, nickel sulfate and cerium sulfate.
Compared with the prior art, the invention provides an automatic line galvanizing color passivation method, which has the following beneficial effects:
1. the invention has the beneficial effects that: the existing zinc coating color passivation is a color film layer obtained by using chromic anhydride, sulfuric acid and nitric acid, only manual production can be carried out, an automatic production line cannot obtain qualified passivation film layers, such as mottles, inconsistent film layers at the upper part and the lower part, and even partial bottom exposure3) The zinc-plated trivalent chromium color passivator has the advantages that raw materials of metal salt, complexing agent, film forming accelerant, oxidant, wetting agent, inhibitor and deionized water are matched, the rationality of selection of the zinc-plated trivalent chromium color passivator material is enhanced, the degree of fit among the zinc-plated trivalent chromium color passivator materials is improved, the reaction effect among various ingredients is improved, an automatic production line can be solved, and the problem that the traditional formula is bad in the automatic production line, such as mottle, flow marks and exposed bottoms, is completely customized for the automatic production line.
Drawings
FIG. 1 is a diagram illustrating the test results of an embodiment of the passivation method for color galvanization of an automatic line according to the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1:
chromic anhydride (CrO) is added according to the weight portion3)85 parts of metal salt (nickel sulfate), 15 parts of complexing agent (citric acid), 15 parts of film forming accelerant (sodium sulfate), 35 parts of oxidizing agent (potassium chlorate and sodium hypochlorite are mixed according to the weight ratio of 1: 2), 5 parts of wetting agent (alkylphenol polyoxyethylene ether) and 3 parts of inhibitor (sodium sulfite), adding 200 parts of water, stirring and dissolving the mixture at about 60 ℃, cooling to normal temperature, adding deionized water to a constant volume of 1L, and obtaining the passivating agent for later use.
And passivating the galvanized part by using the passivating agent, wherein the passivating temperature is 20-30 ℃, and the passivating time is 25-40 s.
Example 2:
mixing chromic anhydride (CrO)3)90 parts of metal salt (cerium sulfate), 10 parts of complexing agent (maleic acid), 15 parts of film forming accelerant (sulfuric acid), 40 parts of oxidizing agent (potassium chlorate and sodium hypochlorite are mixed according to the weight ratio of 1: 2), 5 parts of wetting agent (fatty alcohol polyoxyethylene ether) and 3 parts of inhibitor (thiourea dioxide), adding 200 parts of water, stirring and dissolving the mixture at about 90 ℃, cooling to normal temperature, adding water to a constant volume of 1L, and obtaining the passivating agent for later use.
And passivating the galvanized part by using the passivating agent, wherein the passivating temperature is 18-35 ℃, and the passivating time is 15-45 seconds.
Example 3: based on example 1, but with the following differences:
in comparison with example 1, the oxidizer in example 3 is sodium nitrate, and the rest of the formulation and preparation method are the same as those in example 1.
Example 4: based on example 2, but with the difference that:
in contrast to example 2, in example 4 no chromic anhydride (CrO) was added3) The metal salt (cerium sulfate), the rest of the formulation and the preparation method were the same as in example 1.
The appearance of the galvanized and passivated substrates of example 1, example 2, example 3 and example 4 was visually observed and subjected to a salt spray test. The salt spray test standard is according to GB/T10125-1997 artificial atmosphere corrosion test-salt spray test, the temperature of a test box is 35 ℃, 12 samples are put into the test box for testing, and the actual salt spray time is 4d hours. The specific results are shown in FIG. 1.
As can be seen from the data in fig. 1, the passivating agents of the embodiments 1 to 2 have reasonable formulations, and the passivated workpiece has a salt spray effect equivalent to that of the passivated workpiece passivated by the passivating agent using nitric acid as an oxidizing agent in embodiment 3, and has the same color effect. In example 4, no metal salt was added, and the color effect of the passivated passivator was poor.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. An automatic line galvanizing color passivation method is characterized by comprising the following steps:
s1, accurately weighing the following materials in parts by weight: chromic anhydride (CrO)3): 80-100 parts of metal salt: 10-20 parts of complexing agent: 5-20 parts of a film forming promoter: 5-20 parts of an oxidant: 20-50 parts of wetting agent: 1-5 parts of inhibitor: 1-3 parts and 220 parts of deionized water 110-;
s2, adding deionized water into the reaction vessel in advance, heating to a preset temperature, and then adding chromic anhydride (CrO) into the reaction vessel3) Stirring the mixture evenly, continuously stirring the mixture after the mixture is stirred evenly, and adding metal salt;
s3, after the temperature in the reaction container is reduced, sequentially adding a complexing agent, a film forming promoter, an oxidant, a wetting agent, an inhibitor and deionized water into the reaction container, fully stirring all ingredients in the reaction container, and after the ingredient solution in the reaction container is uniformly stirred, obtaining the zinc-plated color passivator solution.
2. The automatic line galvanizing color passivation method according to claim 1, characterized in that: in S2, the stirring time is kept between 10 and 15min after the stirring is uniform, and the reaction temperature of the reaction vessel during the feeding process is controlled within the range of 55 to 70 ℃.
3. The automatic line galvanizing color passivation method according to claim 1, characterized in that: the oxidant is one or more of potassium chlorate, sodium hypochlorite, peroxyacetic acid and potassium permanganate.
4. The automatic line galvanizing color passivation method according to claim 1, characterized in that: the complexing agent is one or more of citric acid, maleic acid, malonic acid, ammonium bifluoride and potassium sodium tartrate.
5. The automatic line galvanizing color passivation method according to claim 1, characterized in that: the film forming promoter is sodium sulfate.
6. The automatic line galvanizing color passivation method according to claim 1, characterized in that: the wetting agent is one or more of alkylphenol polyoxyethylene, fatty alcohol polyoxyethylene ether and sodium dodecyl benzene sulfonate; the inhibitor is at least one of sodium sulfite, sodium bisulfite and thiourea dioxide.
7. The automatic line galvanizing color passivation method according to claim 1, characterized in that: the metal salt is one or more of cobalt sulfate, nickel sulfate and cerium sulfate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110501706.6A CN113201730A (en) | 2021-05-08 | 2021-05-08 | Automatic line galvanizing color passivation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110501706.6A CN113201730A (en) | 2021-05-08 | 2021-05-08 | Automatic line galvanizing color passivation method |
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| Publication Number | Publication Date |
|---|---|
| CN113201730A true CN113201730A (en) | 2021-08-03 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4171231A (en) * | 1978-04-27 | 1979-10-16 | R. O. Hull & Company, Inc. | Coating solutions of trivalent chromium for coating zinc surfaces |
| CN107236948A (en) * | 2017-06-07 | 2017-10-10 | 广州传福化学技术有限公司 | It is a kind of to suppress the passivator that zinc coating trivalent chromium is oxidized to Cr VI |
| CN111364034A (en) * | 2020-02-18 | 2020-07-03 | 广州传福化学技术有限公司 | Nitrogen-free galvanized trivalent chromium color passivator and preparation method thereof |
| CN112126919A (en) * | 2020-08-24 | 2020-12-25 | 安徽未来表面技术有限公司 | Passivation method of aluminum hexavalent chromium passivator |
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- 2021-05-08 CN CN202110501706.6A patent/CN113201730A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4171231A (en) * | 1978-04-27 | 1979-10-16 | R. O. Hull & Company, Inc. | Coating solutions of trivalent chromium for coating zinc surfaces |
| CN107236948A (en) * | 2017-06-07 | 2017-10-10 | 广州传福化学技术有限公司 | It is a kind of to suppress the passivator that zinc coating trivalent chromium is oxidized to Cr VI |
| CN111364034A (en) * | 2020-02-18 | 2020-07-03 | 广州传福化学技术有限公司 | Nitrogen-free galvanized trivalent chromium color passivator and preparation method thereof |
| CN112126919A (en) * | 2020-08-24 | 2020-12-25 | 安徽未来表面技术有限公司 | Passivation method of aluminum hexavalent chromium passivator |
Non-Patent Citations (1)
| Title |
|---|
| 丁莉峰等: "《科学技术文献出版社》", 30 November 2018 * |
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