CN111424295A - Flash plating iron plating solution and flash plating method - Google Patents
Flash plating iron plating solution and flash plating method Download PDFInfo
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- CN111424295A CN111424295A CN202010322900.3A CN202010322900A CN111424295A CN 111424295 A CN111424295 A CN 111424295A CN 202010322900 A CN202010322900 A CN 202010322900A CN 111424295 A CN111424295 A CN 111424295A
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- 238000007747 plating Methods 0.000 title claims abstract description 171
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 170
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 25
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 17
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Substances [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims abstract description 11
- CVHZOJJKTDOEJC-UHFFFAOYSA-N saccharin Chemical compound C1=CC=C2C(=O)NS(=O)(=O)C2=C1 CVHZOJJKTDOEJC-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229940081974 saccharin Drugs 0.000 claims abstract description 10
- 235000019204 saccharin Nutrition 0.000 claims abstract description 10
- 239000000901 saccharin and its Na,K and Ca salt Substances 0.000 claims abstract description 10
- -1 salt iron ion Chemical class 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000008367 deionised water Substances 0.000 claims abstract description 8
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 8
- 229910021380 Manganese Chloride Inorganic materials 0.000 claims abstract description 7
- 239000011565 manganese chloride Substances 0.000 claims abstract description 7
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims abstract description 6
- 229910021577 Iron(II) chloride Inorganic materials 0.000 claims abstract description 5
- 238000009713 electroplating Methods 0.000 claims description 19
- 238000005246 galvanizing Methods 0.000 claims description 16
- 239000000654 additive Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 11
- 150000003839 salts Chemical class 0.000 claims description 10
- 239000008139 complexing agent Substances 0.000 claims description 9
- 229910052603 melanterite Inorganic materials 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 238000005554 pickling Methods 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 4
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical compound Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 claims description 2
- 239000004327 boric acid Substances 0.000 claims description 2
- 125000005619 boric acid group Chemical group 0.000 claims description 2
- 229960002089 ferrous chloride Drugs 0.000 claims description 2
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 claims description 2
- 235000002867 manganese chloride Nutrition 0.000 claims description 2
- 229940099607 manganese chloride Drugs 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 36
- 229910052759 nickel Inorganic materials 0.000 abstract description 18
- 150000002505 iron Chemical class 0.000 abstract description 17
- 230000037452 priming Effects 0.000 abstract description 11
- 239000013078 crystal Substances 0.000 abstract description 8
- 230000009467 reduction Effects 0.000 abstract description 6
- 239000003381 stabilizer Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 abstract description 2
- 231100000252 nontoxic Toxicity 0.000 abstract description 2
- 230000003000 nontoxic effect Effects 0.000 abstract description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical group OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001448 ferrous ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 240000006829 Ficus sundaica Species 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- VABYUUZNAVQNPG-BQYQJAHWSA-N Piplartine Chemical compound COC1=C(OC)C(OC)=CC(\C=C\C(=O)N2C(C=CCC2)=O)=C1 VABYUUZNAVQNPG-BQYQJAHWSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- SQZYOZWYVFYNFV-UHFFFAOYSA-L iron(2+);disulfamate Chemical compound [Fe+2].NS([O-])(=O)=O.NS([O-])(=O)=O SQZYOZWYVFYNFV-UHFFFAOYSA-L 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000006276 transfer reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/20—Electroplating: Baths therefor from solutions of iron
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/081—Iron or steel solutions containing H2SO4
-
- 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
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electroplating Methods And Accessories (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
The invention discloses a flash plating iron plating solution and a flash plating method, wherein the flash plating iron plating solution adopts a low-cost iron salt, optimized reduction, stabilizer and aqueous formula, can obtain a better stable iron plating solution, is used for high-speed flash plating iron and can replace the existing flash nickel plating process for priming before electrogalvanizing. The flash-plated iron plating solution is made of FeCl2、FeSO4、H3BO3Concentrated H2SO4、MnCl2KI, saccharin and deionized water. The flash plating process is green, environment-friendly, pollution-free, wide in applicable current density range, small in main salt iron ion consumption, non-toxic, odor-free, completely water-soluble, easy to obtain and low in cost. And the surface of the steel subjected to the flash iron plating treatment can obtain an extremely thin iron layer, and the flash iron plating layer has fine and uniform crystal grains, large specific surface area and good binding force of subsequent galvanization. Can replace flashThe nickel plating is the priming work of the next electrogalvanizing step, and the same repairing effect of flash nickel plating is achieved.
Description
Technical Field
The invention relates to a plating solution and a chemical plating method thereof, in particular to an iron ion plating solution for priming before electrogalvanizing and an iron plating process thereof, which are applied to the fields of chemical engineering and metal surface electroplating processes.
Background
At present, flash nickel plating is mainly used for priming before electrogalvanizing at home and abroad, so that the influence of defects (such as pits, scratches and the like) on the surface of strip steel on the electroplating quality is remarkably reduced, the electroplated surface of the strip steel is repaired to a greater extent, a fine and smooth and bright zinc layer surface is obtained, and the binding force of a plating layer and a steel substrate is ensured; the coating is used for improving the corrosion resistance, the coating property and the like of the surfaces of certain steel band steels on a continuous annealing production line.
The Chinese Bao steel electrogalvanizing unit is the earliest and most stable electrogalvanizing production line in China, and the yield is the world-ahead. The flash nickel plating process is added before the electrogalvanizing in the process, and the phenomenon of wire spots is obviously improved; however, the nickel ion content of the plating solution in the currently generally adopted flash nickel plating process is high, the cost is high, the amount of flash nickel plating solution brought out during production is large, the amount of produced wastewater is large, and great pressure is brought to environmental protection production and wastewater treatment. According to the development trend and the environmental protection requirement, the non-nickel or low-nickel treatment before flash plating is the main development direction in the future. The flash nickel plating before electrogalvanizing is replaced by developing a flash iron plating process, and the process and the main formula are determined, so that the discharge of nickel-containing wastewater is reduced, the production cost is reduced, the plate shape is improved, and the binding force of a zinc layer is improved to provide process technical support. The prior literature or enterprise iron plating formula mostly adopts ferric salts with higher cost such as ferrous fluoborate, ferrous sulfamate and the like for direct electroplating, and no bottoming experiment verification before galvanizing is used. Therefore, the development of a low-cost and stable iron plating solution and a flash plating process thereof becomes a technical problem to be solved urgently.
Disclosure of Invention
In order to solve the problems of the prior art, the invention aims to overcome the defects of the prior art and provide the flash plating iron plating solution and the flash plating method. And the surface of the steel subjected to the flash iron plating treatment can obtain an extremely thin iron layer, and the flash iron plating layer has fine and uniform crystal grains and large specific surface area. Can replace flash nickel plating to make priming work for next electrogalvanizing, and achieves the repair effect of flash nickel plating and the binding force of subsequent galvanizing. The iron plating solution and the flash plating method have simple processes and low price, and are easy to realize industrialized implementation.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a flash plating iron plating solution is mainly prepared by mixing inorganic ferric salt, inorganic plating additive, complexing agent and solvent.
As a preferable technical scheme of the invention, in the flash iron plating solution, the concentration of the inorganic iron salt is 20-100 g/L, the concentration of the inorganic plating additive is 1-47 g/L, and the concentration of the complexing agent is 1-3 g/L.
Preferably, the inorganic ferric salt is ferrous chloride tetrahydrate and ferrous sulfate heptahydrate, and the flash plating iron plating solution contains 10-50 g/L FeCl2·4H2O and 10-50 g/L FeSO4·7H2O。
Preferably, the complexing agent is saccharin.
Preferably, the inorganic electroplating additive is boric acid, sulfuric acid, manganese chloride and potassium iodide; in the flash iron plating bath, H3BO3Has a concentration of 10-15 g/L and H2SO4The concentration of (A) is 1-10 g/L, MnCl2The concentration of the saccharin is 0-10 g/L, the concentration of KI is 8-12 g/L, and the concentration of saccharin is 0-3 g/L.
Preferably, the solvent is deionized water.
A flash plating method, which adopts the flash plating iron plating solution to implement the flash plating process, comprises the following steps:
a. carrying out acid pickling pretreatment on a steel plate to be treated by using 20-40 g/L sulfuric acid, and soaking the pretreated steel plate serving as a cathode in flash-plating iron plating solution to assemble an electroplating device;
b. controlling the current density of the cathode current on the surface of the steel plate to be 20-200A/dm2Under the condition of (1), carrying out flash plating treatment to obtain a steel plate product with a flash plated iron layer formed on the surface.
In the step b, preferably, the flash plating treatment is performed at a temperature of 40-60 ℃; the flash plating treatment time is preferably 500 ms-5 s; preferably, the flash plating treatment is performed in a plating solution having a pH value within the range of 2 to 4.
Preferably, the concentration of the iron salt in the flash iron plating solution is 20 to 100 g/L.
The preferable plating solution is stable, the plating layer is uniform and compact, and the binding force of the subsequent galvanizing reaches 1 grade.
Compared with the prior art, the invention has the following prominent substantive characteristics and remarkable advantages:
1. in the flash plating process, iron ions in the plating solution are transferred to the surface of a cathode (a metal plate or other metal parts) and adsorbed on the surface of strip steel, and a charge transfer reaction is carried out to reduce the iron ions into iron atoms through cathode current provided by a rectifier so as to obtain a flash plated iron layer; the key steps in the flash plating electrodeposition process are the generation of new crystal nuclei and the growth of crystals, and the competition of the two steps directly influences the state of crystal grains generated by the plating layer; the flash iron plating solution formula of the invention has high cathode overpotential, high total number of adsorbed atoms and low surface mobility of the adsorbed atoms, meets the necessary conditions of mass nucleation and grain growth reduction, and ensures that crystal nuclei are formed, but the crystal nuclei and the grain growth can be greatly inhibited, thereby obtaining an iron plating layer;
2. because the plating layer is in the intermediate state that crystal nucleus is formed but does not grow, the flash-plated iron plating layer is very thin and very compact, so that the plating layer has the unique characteristics of uniform surface, small internal stress, high brightness, excellent surface quality and the like, and has obvious covering effect on the surface defects of the metal substrate; the invention adopts a low-cost iron salt formula and an optimized reduction, stabilizer and aqueous formula to obtain better guarantee of the stability of the plating solution, and subsequent galvanizing experiments prove that the plating solution has compact galvanizing morphology after plating iron and then galvanizing, and can replace a flash nickel plating process for priming before galvanizing;
3. the method has simple process, easy realization and very obvious economic benefit.
Drawings
FIG. 1 shows a Hall cell of 20-250A/dm in accordance with an embodiment of the present invention2Photograph of steel plate flash-plated with iron at current density for 2 min.
FIG. 2 shows the flash-plated iron current density of 60A/dm after pretreatment of a steel sheet according to an embodiment of the present invention2The surface appearance of the lower electroplating 1 s.
FIG. 3 shows an embodiment of the present invention after a primer is applied and then 60A/dm is applied2The appearance of a coating with the thickness of 20 mu m of electrogalvanizing.
FIG. 4 shows an embodiment of the present invention after a bottoming step at 200A/dm2The appearance of a coating with the thickness of 20 mu m of electrogalvanizing.
Detailed Description
The above-described scheme is further illustrated below with reference to specific embodiments, which are detailed below:
the first embodiment is as follows:
in this example, a flash iron plating bath was prepared in which the iron salt concentration was 90g/l (prepared ion concentration was 20.132 g/L), the inorganic plating additive concentration was 28.5 g/L, and the complexing agent concentration was 2.5 g/L.
In this example, for preparing 25L electroplating solution, 10L of deionized water was first placed in a container and concentrated H2SO4Slowly and uniformly pouring the plating solution into a container according to the proportion of 5-15 g/L, uniformly stirring, adding inorganic ferric salt, inorganic electroplating additive, saccharin and deionized water into the container according to the proportion, wherein the concentration of iron ions is 20.132 g/L, stirring until the iron ions are completely dissolved, adding the deionized water, and finally enabling the plating solution to be 25L. according to the contrast proportion of the ferric salt and flash plating iron plating solution, 40 g/L FeCl is adopted2·4H2O and 50 g/L FeSO4·7H2O as a raw iron salt for preparing a flash iron plating bath, H3BO3The concentration is 10 g/L, H2SO4The concentration is 1.5 g/L2Pouring the prepared electroplating solution into an electroplating pool, heating to the temperature of 40-60 ℃, adjusting the pH value of the plating solution to the pH value range of 2-4 by using concentrated sulfuric acid, carrying out acid pickling passivation on the steel sheet by using 20-40 g/L sulfuric acid, soaking the acid-pickled and passivated steel sheet as a cathode in a flash-plating iron plating solution, soaking the pure iron sheet as an anode in the flash-plating iron plating solution, and controlling the current density of the cathode current on the surface of the steel sheet to be 20-200A/dm2The flash plating treatment is carried out under the condition of (1) to obtain the steel sheet with the flash plated iron layer on the surface. Then the electrogalvanizing is carried out, so that the electrogalvanized layer which is bright and uniform and has excellent surface quality can be obtained.
Experimental test analysis:
1. stability test of plating solution:
the stability of the plating solution is critical with respect to the storage and use of the plating solution. The ferrous ions themselves are relatively less stable and although we have selected a reducing agent, some amount of the ferrous ions will oxidize and colloidally precipitate as ferric hydroxide at slightly higher local pH. According to the formula, the plating solution is respectively stood for 1 day, 2 days and 3 days, the experiment is carefully carried out through water-based filter paper suction filtration, 1ml of the plating solution is diluted into a 250ml volumetric flask for ICP test, and the oxidation precipitation loss rate of iron ions in the crude test is considered in consideration of partial filtration and transfer loss rate.
As can be seen from the above, the stability of the formulation was good and the loss rate of iron salt was low.
2. Electroplating quality detection experiment:
referring to FIGS. 1-4, FIG. 1 shows the present embodiment at 20-250A/dm in Hall cell2Photograph of steel plate flash-plated with iron at current density for 2 min. FIG. 2 shows the flash-plated iron current density of 60A/dm after pretreatment of the steel sheet according to the present example2The surface appearance of the lower electroplating 1 s. FIG. 3 shows the present example after priming at 60A/dm2The appearance of a coating with the thickness of 20 mu m of electrogalvanizing. FIG. 4 shows the present example after priming at 200A/dm2The appearance of a coating with the thickness of 20 mu m of electrogalvanizing. The results of the above figures 1-4 show that the iron electroplating is compact and uniform, and the zinc layer after the subsequent zinc electroplating is also compact, which can be considered to replace the current zinc plating process after nickel plating. In addition, the coating of the galvanized product is bright and full, the binding force of the coating reaches 1 grade by testing the galvanized steel sheet with a white lattice knife, and the binding force is extremely good.
Example two:
this embodiment is substantially the same as the first embodiment, and is characterized in that:
in this example, a flash-plating bath contains 68 g/L of iron-containing salt, 28 g/L of inorganic plating additive, 1.0 g/L of complexing agent, and the balance of deionized water, wherein the iron salt is FeCl2·4H2O and FeSO4·7H2O, the inorganic plating additive is H3BO3、H2SO4And KI, H in flash iron plating bath3BO3The concentration is 10 g/L, H2SO4The concentration of the solution is 10 g/L, the concentration of the solution is 8.0 g/L, the concentration of saccharin is 1.0 g/L, and 18 g/L FeCl is adopted according to the comparative ratio of iron salt to flash-plated iron plating solution2·4H2O and 50 g/L FeSO4·7H2O is used as the ferric salt raw material for preparing the flash plating iron plating solution.
In this embodiment, the flash plating method, which adopts the flash plated iron plating solution of this embodiment to perform the flash plating process, includes the following steps:
a. carrying out acid pickling pretreatment on a steel plate to be treated by using 20-40 g/L sulfuric acid, and soaking the pretreated steel plate serving as a cathode in flash-plating iron plating solution to assemble an electroplating device;
b. controlling the current density of the cathode current on the surface of the steel plate to be 20-200A/dm2Under the condition of (1), carrying out flash plating treatment to obtain a steel plate product with a flash plated iron layer formed on the surface.
The invention adopts a low-cost iron salt formula and an optimized reduction, stabilizer and aqueous formula to obtain better guarantee of the stability of the plating solution, and subsequent galvanizing experiments prove that the plating solution has compact galvanizing appearance after plating iron and then galvanizing, and can replace a flash nickel plating process of priming before galvanizing.
Example three:
this embodiment is substantially the same as the previous embodiment, and is characterized in that:
in this example, a flash-plating bath was prepared with iron salt 20 g/L, inorganic plating additives 47 g/L, complexing agent 3.0 g/L, and deionized water as the balance, wherein the iron salt was FeCl2And FeSO4The inorganic plating additive is H3BO3、H2SO4、MnCl2And KI, H in flash iron plating bath3BO3The concentration is 15 g/L, H2SO4The concentration is 10 g/L2The concentration of 10 g/L is 12 g/L, the concentration of saccharin is 3.0 g/L, according to the contrast ratio of iron salt and flash-plating iron plating solution, 10 g/L FeCl is adopted2·4H2O and 10 g/L FeSO4·7H2O as iron salt for preparing flash iron plating solutionRaw materials.
In this embodiment, the flash plating method, which adopts the flash plated iron plating solution of this embodiment to perform the flash plating process, includes the following steps:
a. carrying out acid pickling pretreatment on a steel plate to be treated by using 20-40 g/L sulfuric acid, and soaking the pretreated steel plate serving as a cathode in flash-plating iron plating solution to assemble an electroplating device;
b. controlling the current density of the cathode current on the surface of the steel plate to be 20-200A/dm2Under the condition of (1), carrying out flash plating treatment to obtain a steel plate product with a flash plated iron layer formed on the surface.
The invention adopts a low-cost iron salt formula and an optimized reduction, stabilizer and aqueous formula to obtain better guarantee of the stability of the plating solution, and subsequent galvanizing experiments prove that the plating solution has compact galvanizing appearance after plating iron and then galvanizing, and can replace a flash nickel plating process of priming before galvanizing.
In conclusion, the invention provides a low-cost iron salt, optimized reduction and stabilizer and aqueous formula, can obtain an iron plating solution with better stability, is used for high-speed flash iron plating and can replace the existing flash nickel plating process for priming before electrogalvanizing, and the flash iron plating solution comprises 20-100 g/L of iron salt and 10-15 g/L H3BO31-10 g of concentrated H2SO4、0～10g/L MnCl2The flash plating process is green, environment-friendly and pollution-free, is wide in applicable current density range, low in main salt iron ion consumption, non-toxic, odorless, completely water-soluble, easy to obtain and low in cost, an extremely thin iron layer can be obtained on the surface of steel subjected to flash plating iron treatment, the grains of the flash plating iron layer are fine and uniform, the specific surface area is large, and the subsequent zinc plating binding force is good.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes and modifications can be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention shall be equivalent substitutions, so long as the purpose of the present invention is met, and the present invention shall fall within the protection scope of the present invention without departing from the technical principle and inventive concept of the flash iron plating solution and the flash plating method of the present invention.
Claims (10)
1. A flash iron plating solution is characterized in that: mainly prepared by mixing inorganic ferric salt, inorganic electroplating additive, complexing agent and solvent.
2. The flash iron plating solution of claim 1, wherein the concentration of the inorganic ferric salt is 20-100 g/L, the concentration of the inorganic plating additive is 1-47 g/L, and the concentration of the complexing agent is 1-3 g/L.
3. The flash-plating iron plating solution according to claim 1, wherein the inorganic ferric salt is ferrous chloride tetrahydrate and ferrous sulfate heptahydrate, and the flash-plating iron plating solution contains 10-50 g/L FeCl2·4H2O and 10-50 g/L FeSO4·7H2O, the concentration of iron ions in the flash iron plating solution is 5-25 g/L.
4. The flash iron plating solution according to claim 1, characterized in that: the complexing agent is saccharin.
5. The flash iron plating solution according to claim 1, characterized in that: the inorganic electroplating additive is boric acid, sulfuric acid, manganese chloride and potassium iodide; in the flash iron plating bath, H3BO3Has a concentration of 10-15 g/L and H2SO4The concentration of (A) is 1-10 g/L, MnCl2The concentration of the saccharin is 0-10 g/L, the concentration of KI is 8-12 g/L, and the concentration of saccharin is 0-3 g/L.
6. The flash iron plating solution according to claim 1, characterized in that: the solvent is deionized water.
7. A flash plating method characterized by carrying out a flash plating process using the flash plated iron plating solution according to claim 1, comprising the steps of:
a. carrying out acid pickling pretreatment on a steel plate to be treated by using 20-40 g/L sulfuric acid, and soaking the pretreated steel plate serving as a cathode in flash-plating iron plating solution to assemble an electroplating device;
b. controlling the current density of the cathode current on the surface of the steel plate to be 20-200A/dm2Under the condition of (1), carrying out flash plating treatment to obtain a steel plate product with a flash plated iron layer formed on the surface.
8. The flash plating method according to claim 7, characterized in that: in the step b, the flash plating treatment is carried out at the temperature of 40-60 ℃;
or the flash plating treatment time is 500 ms-5 s;
or the flash plating treatment is carried out in a plating solution with the pH value ranging from 2 to 4.
9. A flash plating method according to claim 7, wherein the concentration of iron ions in the flash plated iron plating solution is 5 to 25 g/L.
10. The flash plating method according to claim 7, characterized in that: the plating solution is stable, the plating layer is uniform and compact, and the binding force of subsequent galvanizing reaches level 1.
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| CN115305529A (en) * | 2021-05-07 | 2022-11-08 | 宝山钢铁股份有限公司 | Galvanizing process of high-surface-quality electrogalvanized steel plate |
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