CN114703470A - Environment-friendly passivation solution and passivation process for metal component - Google Patents
Environment-friendly passivation solution and passivation process for metal component Download PDFInfo
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- 238000002161 passivation Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 18
- 239000002184 metal Substances 0.000 title claims abstract description 18
- 230000008569 process Effects 0.000 title claims abstract description 18
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 10
- -1 rare earth salt Chemical class 0.000 claims abstract description 10
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 claims abstract description 9
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 claims abstract description 9
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 9
- 229940068041 phytic acid Drugs 0.000 claims abstract description 9
- 235000002949 phytic acid Nutrition 0.000 claims abstract description 9
- 239000000467 phytic acid Substances 0.000 claims abstract description 9
- 229910000077 silane Inorganic materials 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000001590 oxidative effect Effects 0.000 claims abstract description 7
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 6
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 6
- 239000007800 oxidant agent Substances 0.000 claims abstract description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000004327 boric acid Substances 0.000 claims abstract description 5
- 238000000746 purification Methods 0.000 claims abstract description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 229920006332 epoxy adhesive Polymers 0.000 claims description 4
- 238000007602 hot air drying Methods 0.000 claims description 4
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 239000011684 sodium molybdate Substances 0.000 claims description 4
- 235000015393 sodium molybdate Nutrition 0.000 claims description 4
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 claims description 4
- 230000006378 damage Effects 0.000 claims description 3
- 239000013527 degreasing agent Substances 0.000 claims description 3
- 238000005237 degreasing agent Methods 0.000 claims description 3
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical group [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 3
- 208000034656 Contusions Diseases 0.000 claims description 2
- 208000027418 Wounds and injury Diseases 0.000 claims description 2
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 claims description 2
- 239000011609 ammonium molybdate Substances 0.000 claims description 2
- 235000018660 ammonium molybdate Nutrition 0.000 claims description 2
- 229940010552 ammonium molybdate Drugs 0.000 claims description 2
- 208000034526 bruise Diseases 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 208000014674 injury Diseases 0.000 claims description 2
- 150000002603 lanthanum Chemical class 0.000 claims description 2
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 16
- 239000010959 steel Substances 0.000 abstract description 16
- 230000007797 corrosion Effects 0.000 abstract description 12
- 238000005260 corrosion Methods 0.000 abstract description 12
- 238000000861 blow drying Methods 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 abstract description 2
- 231100000956 nontoxicity Toxicity 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 229910019142 PO4 Inorganic materials 0.000 description 4
- 229910001430 chromium ion Inorganic materials 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000010452 phosphate Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 2
- 230000000536 complexating effect Effects 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000005078 molybdenum compound Substances 0.000 description 1
- 150000002752 molybdenum compounds Chemical class 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000011787 zinc oxide 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
- C23C22/40—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 molybdates, tungstates or vanadates
- C23C22/42—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 molybdates, tungstates or vanadates containing also phosphates
-
- 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
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
Abstract
An environment-friendly passivation solution and passivation process for metal components comprises the following components in parts by weight: 20-25 parts of binder, 20-25 parts of molybdate, 10-15 parts of sodium silicate, 2-3 parts of boric acid, 6-8 parts of oxidant, 5-10 parts of organic auxiliary agent, 6-12 parts of rare earth salt and 15-20 parts of phytic acid and silane in total. The passivation process comprises the following steps: the method comprises the steps of seepage layer inspection, surface purification, hot water washing, hot air blow-drying, passivation and drying. The passivation solution and the passivation process have the advantages of no toxicity and no pollution, are suitable for the later passivation treatment of the zincification steel, improve the corrosion resistance of the zincification steel and enable the zincification steel to adapt to a complex natural environment.
Description
Technical Field
The invention relates to the technical field of metal rust prevention, in particular to an environment-friendly passivation solution and a passivation process for a metal component.
Background
Zinciferous steel is currently used more and more widely in the field of high-speed rail, and the stability and safety of high-speed rail operation depend on the reliability of rail quality. Because steel is in a natural environment for a long time and is corroded by the environment, common steel cannot provide reliable safety for the operation of high-speed rails. Thus, a steel material obtained by the zincification treatment can be produced. In the face of natural environment, the corrosion resistance of steel is often very important. Materials with poor corrosion resistance are prone to rust under the influence of the environment, which creates a potential safety hazard.
A layer of thin, compact and stable passivation protective film is formed on the surface of the zincification steel, so that oxygen atoms can be prevented from permeating and oxidizing, and the corrosion resistance can be obtained. Without changing the appearance, size and shape of the steel. In the passivation of steel, chromate treatment is conventionally used as the passivation treatment. The chromate reacts with the zincating layer to form a passive film which greatly enhances the corrosion resistance of the material. However, since hexavalent chromium ions are harmful to the environment, even if trivalent chromium ions are used for passivation, they are oxidized into hexavalent chromium ions under the influence of the environment, thereby causing damage to the environment. Therefore, the research of novel environment-friendly chromium-free passivation solution is a necessary trend.
The passivation method for steel at present mainly comprises inorganic salt system passivation, organic matter system passivation and organic-inorganic composite system passivation. The passivation of inorganic salt systems also comprises the passivation of phosphate, the passivation of molybdate, the passivation of rare earth salt and the like, the passivation of phosphate causes certain pollution to the environment due to the existence of phosphate ions and can not adapt to the technical requirements gradually, and the research of the passivation solution of the molybdate system becomes a research trend. The passivation of organic matter system includes silane passivation, amine derivative passivation, phytic acid passivation, etc. The inorganic-organic complex salt passivation system is researched by many scholars at present in China, and a passivation solution which does not pollute the environment is searched and researched while the passivation steel is expected to have better corrosion resistance. So far, no good chromium-free passivation solution is widely accepted.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides an environment-friendly passivation solution and passivation process for metal components, wherein an organic-inorganic composite method is adopted, a molybdate system is used for replacing a traditional phosphate system, the pollution to the environment is reduced, and a passivation film with excellent performance is obtained by adopting an excellent passivation process.
In order to achieve the purpose, the invention adopts the following technical scheme:
an environment-friendly passivation solution for metal components comprises the following components in parts by weight: 20-25 parts of a binder, 20-25 parts of molybdate, 10-15 parts of sodium silicate, 2-3 parts of boric acid, 6-8 parts of an oxidant, 5-10 parts of an organic auxiliary agent, 6-12 parts of rare earth salt and 15-20 parts of phytic acid and silane in total, wherein the weight ratio of the phytic acid to the silane is 1: 1.2-1.5.
The binder is an epoxy adhesive.
The molybdate may be sodium molybdate or ammonium molybdate.
The oxidant is hydrogen peroxide.
The rare earth salt is a lanthanum salt.
The lanthanum salt is selected from at least one of lanthanum chloride and lanthanum nitrate.
The organic auxiliary agent is silicon dioxide.
The invention discloses a passivation process by adopting the environment-friendly passivation solution for the metal component, which comprises the following steps:
1) checking the thickness of the infiltrated layer: checking whether the infiltrated part has serious scratch, bruise and smashing injury, and sampling to check that the thickness of the infiltrated layer reaches the specified requirement (more than 60 mu m);
2) surface purification: removing the floating and sinking and anti-sticking agent on the surface of the workpiece by using a degreasing agent;
3) hot water washing and hot air drying: washing the purified workpiece with hot water, then drying the surface with hot air, and controlling the temperature of the workpiece to be 40-45 ℃ after the process is finished;
4) passivation: immersing a workpiece into a passivation solution with the temperature of 40-60 ℃ and the pH value of 2-3 for passivation, wherein the passivation time is kept for 10-15 s;
5) and (3) drying: after passivation, the mixture is dried by hot air and then cooled to room temperature for storage.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. according to the invention, molybdate is used for replacing phosphate, and rare earth salt is added for complexing with molybdate, so that the stability of the passive film can be improved. The molybdate passivation solution has low toxicity, and the composite passivation film of the molybdate passivation solution and the silicate is bright, uniform and good in compactness. The molybdate forms a passivation film composed of zinc oxide and molybdenum compounds on the zinc surface due to adsorption, deposition, oxidation and ion selectivity of the film. The molybdenum element and the chromium element belong to VIB group elements in the chemical periodic table, and the chemical properties of the molybdenum element and the chromium element are similar. And the environmental pollution can be reduced by using molybdenum instead of chromium.
2. The invention adds sodium silicate, which has passivation effect on zinc infiltrated steel plate, and can improve the stability of passivation film by coordinating with sodium molybdate, and it has advantages of innocuity, no pollution to environment and low price.
3. The adhesive is an epoxy adhesive, and the epoxy adhesive has strong adhesive property to various materials, particularly metal materials, and has good chemical corrosion resistance, heat resistance, mechanical property, processing manufacturability and other excellent properties after monomer curing.
4. The boric acid can react with metal ions to form borate, and the generation of a passive film is promoted.
5. The oxidant is hydrogen peroxide, and the stability of high valence ions in the passivation solution can be ensured by adding the hydrogen peroxide.
6. The organic auxiliary agent is silicon dioxide, can improve the adhesive force of a passive film, assist corrosion prevention and improve the coating performance of a product
7. The rare earth salt is lanthanum salt which is used as a rare earth salt passivator, so that crystal grains can be refined, the wettability and the flowability of a passivating solution can be improved, the corrosion resistance of a zincified layer is improved, and the stability of a passivating film can be improved by complexing the rare earth salt with molybdate.
8. The phytic acid and the silane form a more compact composite passive film through the cross-linking-synergistic effect, and linear polymers Si-O-Si and Zn are formed on the surface of a galvanized steel sheet and are tightly combined through Si-O-Zn bonds to block O2And the transfer and the transmission of electrons, change the reaction process of the interface, improve the cathode polarization, reduce the corrosion rate and improve the corrosion resistance of the galvanized steel sheet.
9. The passivation solution does not contain chromium ions, has the characteristic of environmental friendliness, is simple and convenient to operate, and is suitable for batch production in factories.
Drawings
FIG. 1 is a flow chart of the passivation process of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be made with reference to the preferred embodiments of the present invention for an environment-friendly passivation solution and passivation process for metal components. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
It is to be noted that those not indicated for the specific conditions, carried out under the conventional conditions or conditions recommended by the manufacturer, and those not indicated for the reagents or equipment, which are used, are commercially available as conventional products.
Examples 1 to 7: the components and the corresponding parts by weight of the components are shown in Table 1. Wherein the ratio of the phytic acid to the silane is 1: 1.2. The pH of the passivation solutions of examples 1-7 was adjusted to 2.5 (adjusted with hydrochloric acid).
TABLE 1 Components and parts by weight of examples 1 to 7
| Components | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 |
| Epoxy resin | 20 | 25 | 22 | 23 | 23 | 22 | 22 |
| Sodium molybdate | 20 | 25 | 23 | 22 | 22 | 23 | 23 |
| Sodium silicate | 10 | 15 | 11 | 13 | 0 | 11 | 11 |
| Boric acid | 2 | 3 | 2.5 | 2.2 | 2 | 2.5 | 2.5 |
| Hydrogen peroxide solution | 6 | 8 | 7 | 7.5 | 6 | 0 | 7 |
| Lanthanum chloride | 6 | 10 | 7 | 8 | 6 | 7 | 0 |
| Silicon dioxide | 5 | 12 | 8 | 10 | 5 | 8 | 10 |
| Phytic acid and silane | 15 | 20 | 16 | 18 | 15 | 16 | 18 |
Examples 8 to 14: a passivation process of an environment-friendly passivation solution for metal components takes the environment-friendly passivation solution in embodiments 1-7 as a construction object, and combines with a figure 1, and the specific process flow is as follows: the method comprises the steps of seepage layer inspection, surface purification, hot water washing, hot air blow-drying, passivation and drying. The degreasing agent adopts a common detergent, the temperature of hot water washing and hot air drying is 45 ℃, and after the hot water washing and hot air drying, the temperature of the workpiece is controlled to be 40 ℃. During passivation, the galvanized workpiece is placed in a drying oven at 40 ℃ for heating, taken out and fixed, the passivation solution is transferred to the surface of the workpiece, and after being uniformly coated, the workpiece is placed in the drying oven at 55 ℃ for drying for 15s, and the passivated workpiece can be obtained.
The workpieces of examples 8-14 were subjected to salt spray resistance tests, with reference to GB/T10125-1997 salt spray corrosion test method. The results of the salt spray resistance tests of examples 8 to 11 were approximately the same, and rusting began after about 200 hours. For examples 12-14, the passivation solution lacks sodium silicate, hydrogen peroxide and lanthanum chloride, respectively, and the salt spray resistance effect is poor, and the passivation solution is corroded within about 150-170 hours.
The passivation solution is prepared from ingredients, is suitable for passivating a zinciferous steel plate, can improve the corrosion resistance of the steel plate, does not contain substances harmful to the environment and human bodies, and is a novel inorganic-organic matched environment-friendly passivation solution. The passivation film obtained by the passivation process has good salt spray resistance, and the passivation process is simple to operate.
It should be noted that although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents. The foregoing is illustrative of some, but not all, embodiments of the present invention and is not to be construed as limiting the invention in any way. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention, and all other embodiments obtained without inventive labor are still within the scope of the technical solution of the present invention.
Claims (8)
1. An environment-friendly passivation solution for metal components is characterized by comprising the following components in parts by weight: 20-25 parts of a binder, 20-25 parts of molybdate, 10-15 parts of sodium silicate, 2-3 parts of boric acid, 6-8 parts of an oxidant, 5-10 parts of an organic auxiliary agent, 6-12 parts of rare earth salt and 15-20 parts of phytic acid and silane in total, wherein the weight ratio of the phytic acid to the silane is 1: 1.2-1.5.
2. The environment-friendly passivating solution for metal components as claimed in claim 1, wherein: the binder is an epoxy adhesive.
3. The environment-friendly passivating solution for metal components as claimed in claim 1, wherein: the molybdate may be sodium molybdate or ammonium molybdate.
4. The environment-friendly passivation solution for metal components as claimed in claim 1, wherein: the oxidant is hydrogen peroxide.
5. The environment-friendly passivating solution for metal components as claimed in claim 1, wherein: the rare earth salt is lanthanum salt.
6. The environment-friendly passivation solution for metal components as claimed in claim 5, wherein: the lanthanum salt is selected from at least one of lanthanum chloride and lanthanum nitrate.
7. The environment-friendly passivation solution for metal components as claimed in claim 1, wherein: the organic auxiliary agent is silicon dioxide.
8. The passivation process by using the environment-friendly passivation solution for the metal component as claimed in any one of claims 1 to 7 is characterized by comprising the following steps:
1) checking the thickness of the infiltrated layer: checking whether the infiltrated part has serious scratch, bruise and smashing injury, and checking the infiltrated layer thickness to meet the specified requirements by sampling;
2) surface purification: removing the floating and sinking and anti-sticking agent on the surface of the workpiece by using a degreasing agent;
3) hot water washing and hot air drying: washing the purified workpiece with hot water, then drying the surface with hot air, and controlling the temperature of the workpiece to be 40-45 ℃ after the process is finished;
4) passivation: immersing a workpiece into a passivation solution with the temperature of 40-60 ℃ and the pH value of 2-3 for passivation, wherein the passivation time is kept for 10-15 s;
5) and (3) drying: after passivation, the mixture is dried by hot air and then cooled to room temperature for storage.
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