CN111020439A - Hot galvanizing process - Google Patents
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- CN111020439A CN111020439A CN201911393854.XA CN201911393854A CN111020439A CN 111020439 A CN111020439 A CN 111020439A CN 201911393854 A CN201911393854 A CN 201911393854A CN 111020439 A CN111020439 A CN 111020439A
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
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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
- C23C22/07—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 phosphates
- C23C22/08—Orthophosphates
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Treatment Of Metals (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention discloses a hot galvanizing process, wherein a plated part is prepared by the steps of raw material preparation, cleaning and derusting, plating assisting, hot galvanizing, passivation, drying and surface oiling. According to the hot galvanizing process disclosed by the invention, the adopted plating assistant agent does not contain ammonium chloride, smoke cannot be generated, the surface of the steel plate after plating assistant is secondarily oxidized in the air, the quality of a coating on the surface of the steel plate is improved, the passivation solution has a good passivation effect, hydrogen embrittlement cannot be caused to the steel plate, adverse effects on other properties of the steel plate cannot be caused, the corrosion resistance of the steel plate is improved, and the strength of the steel plate is kept unchanged.
Description
Technical Field
The invention belongs to the technical field of metal part anticorrosion treatment, and particularly relates to a hot galvanizing method for the surface of a cold-rolled steel plate.
Background
The cold-rolled hot-galvanized sheet is used for enhancing the corrosion resistance of the steel sheet by galvanizing the surface of a cold-rolled steel sheet, and the service life of the steel sheet can be greatly prolonged after the surface of the steel sheet is galvanized. With the continuous promotion of industrialization and the rapid development of the processing and manufacturing level in China, the demand of hot-dip galvanized steel sheets is increased gradually, and higher requirements on the quality of hot-dip galvanized products are provided. The thickness and uniformity of the zinc layer are important indexes for evaluating the quality of the galvanized sheet, the corrosion resistance of the product is influenced by the fact that the zinc layer is too thin, and the spot weldability and adhesiveness of the product are influenced by the fact that the zinc layer is too thick.
The influence of the thickness of the zinc layer is complex and nonlinear, the nature of the sacrificial coating and the low corrosion resistance of the zinc are in the process of steel corrosion prevention, and the method of passivating and post-treating the zinc is generally adopted in industry to prolong the service life of the zinc. At present, the problems of uneven thickness and subsequent passivation failure of a cold-rolled steel sheet are easy to occur in the galvanizing process, and a stable galvanizing process and a passivation solution are urgently needed to be developed.
Disclosure of Invention
The invention aims to provide a hot galvanizing method for the surface of a cold-rolled steel plate.
A hot galvanizing method comprises the following steps:
(1) preparing raw materials: sequentially uncoiling, straightening, cutting head and tail and welding a to-be-plated part to prepare a to-be-processed part;
(2) cleaning and derusting: cleaning the surface of the workpiece with clean water, removing rust on the surface of the workpiece with hydrochloric acid for 60-90min, cleaning the workpiece with clean water, and detecting to make the pH value of the surface of the workpiece in the range of 6-8;
(3) plating assistance: completely immersing the workpiece into the plating assistant agent until the workpiece does not bubble in the plating assistant agent, lifting the workpiece out and completely pouring the plating assistant agent;
(4) hot galvanizing: preheating a workpiece by a continuous annealing furnace, attaching liquid zinc by passing through a zinc pot with dissolved zinc, blowing flat airflow by an air knife to scrape redundant zinc liquid back to the zinc pot, and controlling the thickness of a zinc layer;
(5) cooling the workpiece to 38-45 ℃ by water quenching, hoisting the workpiece into a passivation tank by a crane for passivation treatment, wherein the temperature of the passivation solution is normal temperature, and the passivation time is 30-60 s;
(6) and (5) drying the surface of the workpiece in a dryer, and then performing surface oiling treatment.
The piece to be plated is a cold-rolled steel plate.
The operation steps for preparing the raw materials are as follows: hoisting a cold-rolled steel plate to a receiving platform by a crane, hauling the steel plate to an uncoiler by an coiling trolley, rotating the uncoiler to introduce a belt head into a straight head machine to straighten the belt head so as to facilitate the belt threading operation, then feeding the belt head into an inlet shear to perform the head cutting operation, positioning the belt tail to the inlet shear after the previous belt steel strip is fed, then performing the belt tail shearing operation, and welding the previous belt tail and a new belt head by an off-line machine.
The plating assistant agent comprises the following components in parts by weight: 10-15 parts of zinc phytate, 3-8 parts of borax, 10-15 parts of sodium fluoride, 15-20 parts of oxalic acid and 260 parts of water.
The passivation solution comprises the following components in parts by weight: 1.5-3.5 parts of sulfuric acid, 1.5-3.5 parts of phosphoric acid, 3-6 parts of nitric acid, 40-50 parts of hydrogen peroxide, 15-20 parts of sodium silicate, 0.5-1.5 parts of polymaleic anhydride, 0.5-1.5 parts of polyvinyl alcohol, 0.5-1.2 parts of inositol hexaphosphate and 600 parts of water 400-.
The invention has the beneficial effects that: according to the hot galvanizing method disclosed by the invention, the adopted plating assistant agent does not contain ammonium chloride, smoke cannot be generated, the surface of the steel plate after plating assistant is secondarily oxidized in the air, the quality of a coating on the surface of the steel plate is improved, the passivation solution has a good passivation effect, hydrogen embrittlement cannot be caused to the steel plate, adverse effects on other properties of the steel plate cannot be caused, the corrosion resistance of the steel plate is improved, and the strength of the steel plate is kept unchanged.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Example 1
A hot galvanizing method comprises the following steps:
(1) preparing raw materials: hoisting a cold-rolled steel plate onto a material receiving platform by using a crane, dragging the steel plate onto an uncoiler by using an coiling trolley, rotating the uncoiler to introduce a strip head into a straight head machine to straighten the strip head so as to facilitate strip threading operation, then, feeding the strip head into an inlet shear to perform head cutting operation, after the previous strip steel is threaded, positioning a strip tail to the inlet shear, then, performing strip tail cutting operation, and welding the previous strip tail and a new strip head by using an off machine;
(2) cleaning and derusting: cleaning oil stain on the surface of the workpiece with clean water, removing rust on the surface of the workpiece with hydrochloric acid for 70min, cleaning the workpiece with clean water, and detecting to ensure that the pH value of the surface of the workpiece is in the range of 6-8;
(3) plating assistance: completely immersing the workpiece into the plating assistant agent until the workpiece does not bubble in the plating assistant agent, lifting the workpiece out and completely pouring the plating assistant agent; the plating assistant agent comprises the following components in parts by weight: 12 parts of zinc phytate, 5 parts of borax, 12 parts of sodium fluoride, 18 parts of oxalic acid and 180 parts of water;
(4) hot galvanizing: preheating a workpiece by a continuous annealing furnace, attaching liquid zinc by passing through a zinc pot with dissolved zinc, blowing flat airflow by an air knife to scrape redundant zinc liquid back to the zinc pot, and controlling the thickness of a zinc layer;
(5) cooling the workpiece to 40 ℃ by water quenching, hoisting the workpiece into a passivation tank by a crane for passivation treatment, wherein the temperature of the passivation solution is normal temperature, and the passivation time is 50 s; the passivation solution comprises the following components in parts by weight: 2.5 parts of sulfuric acid, 2.5 parts of phosphoric acid, 5 parts of nitric acid, 45 parts of hydrogen peroxide, 18 parts of sodium silicate, 1.2 parts of polymaleic anhydride, 1.2 parts of polyvinyl alcohol, 0.8 part of inositol hexaphosphate and 500 parts of water;
(6) and (5) drying the surface of the workpiece in a dryer, and then performing surface oiling treatment.
Example 2
A hot galvanizing method comprises the following steps:
(1) preparing raw materials: hoisting a cold-rolled steel plate onto a material receiving platform by using a crane, dragging the steel plate onto an uncoiler by using an coiling trolley, rotating the uncoiler to introduce a strip head into a straight head machine to straighten the strip head so as to facilitate strip threading operation, then, feeding the strip head into an inlet shear to perform head cutting operation, after the previous strip steel is threaded, positioning a strip tail to the inlet shear, then, performing strip tail cutting operation, and welding the previous strip tail and a new strip head by using an off machine;
(2) cleaning and derusting: cleaning oil stain on the surface of the workpiece with clean water, removing rust on the surface of the workpiece with hydrochloric acid for 80min, cleaning the workpiece with clean water, and detecting to ensure that the pH value of the surface of the workpiece is in the range of 6-8;
(3) plating assistance: completely immersing the workpiece into the plating assistant agent until the workpiece does not bubble in the plating assistant agent, lifting the workpiece out and completely pouring the plating assistant agent; the plating assistant agent comprises the following components in parts by weight: 15 parts of zinc phytate, 8 parts of borax, 15 parts of sodium fluoride, 15 parts of oxalic acid and 200 parts of water;
(4) hot galvanizing: preheating a workpiece by a continuous annealing furnace, attaching liquid zinc by passing through a zinc pot with dissolved zinc, blowing flat airflow by an air knife to scrape redundant zinc liquid back to the zinc pot, and controlling the thickness of a zinc layer;
(5) cooling the workpiece to 39 ℃ by water quenching, hoisting the workpiece into a passivation tank by a crane for passivation treatment, wherein the temperature of the passivation solution is normal temperature, and the passivation time is 40 s; the passivation solution comprises the following components in parts by weight: 1.8 parts of sulfuric acid, 1.8 parts of phosphoric acid, 4 parts of nitric acid, 45 parts of hydrogen peroxide, 17 parts of sodium silicate, 0.8 part of polymaleic anhydride, 0.8 part of polyvinyl alcohol, 0.8 part of inositol hexaphosphate and 450 parts of water;
(6) and (5) drying the surface of the workpiece in a dryer, and then performing surface oiling treatment.
Example 3
A hot galvanizing method comprises the following steps:
(1) preparing raw materials: hoisting a cold-rolled steel plate onto a material receiving platform by using a crane, dragging the steel plate onto an uncoiler by using an coiling trolley, rotating the uncoiler to introduce a strip head into a straight head machine to straighten the strip head so as to facilitate strip threading operation, then, feeding the strip head into an inlet shear to perform head cutting operation, after the previous strip steel is threaded, positioning a strip tail to the inlet shear, then, performing strip tail cutting operation, and welding the previous strip tail and a new strip head by using an off machine;
(2) cleaning and derusting: cleaning oil stain on the surface of the workpiece with clean water, removing rust on the surface of the workpiece with hydrochloric acid for 75min, cleaning the workpiece with clean water, and detecting to ensure that the pH value of the surface of the workpiece is in the range of 6-8;
(3) plating assistance: completely immersing the workpiece into the plating assistant agent until the workpiece does not bubble in the plating assistant agent, lifting the workpiece out and completely pouring the plating assistant agent; the plating assistant agent comprises the following components in parts by weight: 12 parts of zinc phytate, 4 parts of borax, 11 parts of sodium fluoride, 16 parts of oxalic acid and 190 parts of water;
(4) hot galvanizing: preheating a workpiece by a continuous annealing furnace, attaching liquid zinc by passing through a zinc pot with dissolved zinc, blowing flat airflow by an air knife to scrape redundant zinc liquid back to the zinc pot, and controlling the thickness of a zinc layer;
(5) cooling the workpiece to 43 ℃ by water quenching, hoisting the workpiece into a passivation tank by a crane for passivation treatment, wherein the temperature of the passivation solution is normal temperature, and the passivation time is 50 s; the passivation solution comprises the following components in parts by weight: 2.2 parts of sulfuric acid, 2.2 parts of phosphoric acid, 5 parts of nitric acid, 42 parts of hydrogen peroxide, 16 parts of sodium silicate, 1.2 parts of polymaleic anhydride, 1.2 parts of polyvinyl alcohol, 0.9 part of inositol hexaphosphate and 500 parts of water;
(6) and (5) drying the surface of the workpiece in a dryer, and then performing surface oiling treatment.
Example 4
A hot galvanizing method comprises the following steps:
(1) preparing raw materials: hoisting a cold-rolled steel plate onto a material receiving platform by using a crane, dragging the steel plate onto an uncoiler by using an coiling trolley, rotating the uncoiler to introduce a strip head into a straight head machine to straighten the strip head so as to facilitate strip threading operation, then, feeding the strip head into an inlet shear to perform head cutting operation, after the previous strip steel is threaded, positioning a strip tail to the inlet shear, then, performing strip tail cutting operation, and welding the previous strip tail and a new strip head by using an off machine;
(2) cleaning and derusting: cleaning oil stain on the surface of the workpiece with clean water, removing rust on the surface of the workpiece with hydrochloric acid for 60min, cleaning the workpiece with clean water, and detecting to ensure that the pH value of the surface of the workpiece is in the range of 6-8;
(3) plating assistance: completely immersing the workpiece into the plating assistant agent until the workpiece does not bubble in the plating assistant agent, lifting the workpiece out and completely pouring the plating assistant agent; the plating assistant agent comprises the following components in parts by weight: 14 parts of zinc phytate, 7 parts of borax, 14 parts of sodium fluoride, 18 parts of oxalic acid and 230 parts of water;
(4) hot galvanizing: preheating a workpiece by a continuous annealing furnace, attaching liquid zinc by passing through a zinc pot with dissolved zinc, blowing flat airflow by an air knife to scrape redundant zinc liquid back to the zinc pot, and controlling the thickness of a zinc layer;
(5) cooling the workpiece to 45 ℃ by water quenching, hoisting the workpiece into a passivation tank by a crane for passivation treatment, wherein the temperature of the passivation solution is normal temperature, and the passivation time is 50 s; the passivation solution comprises the following components in parts by weight: 2.5 parts of sulfuric acid, 2.5 parts of phosphoric acid, 4 parts of nitric acid, 40 parts of hydrogen peroxide, 15 parts of sodium silicate, 0.5 part of polymaleic anhydride, 0.5 part of polyvinyl alcohol, 0.5 part of inositol hexaphosphate and 400 parts of water;
(6) and (5) drying the surface of the workpiece in a dryer, and then performing surface oiling treatment.
Comparative example 1
A hot galvanizing method comprises the following steps:
(1) preparing raw materials: hoisting a cold-rolled steel plate onto a material receiving platform by using a crane, dragging the steel plate onto an uncoiler by using an coiling trolley, rotating the uncoiler to introduce a strip head into a straight head machine to straighten the strip head so as to facilitate strip threading operation, then, feeding the strip head into an inlet shear to perform head cutting operation, after the previous strip steel is threaded, positioning a strip tail to the inlet shear, then, performing strip tail cutting operation, and welding the previous strip tail and a new strip head by using an off machine;
(2) cleaning and derusting: cleaning oil stain on the surface of the workpiece with clean water, removing rust on the surface of the workpiece with hydrochloric acid for 70min, cleaning the workpiece with clean water, and detecting to ensure that the pH value of the surface of the workpiece is in the range of 6-8;
(3) plating assistance: completely immersing the workpiece into the plating assistant agent until the workpiece does not bubble in the plating assistant agent, lifting the workpiece out and completely pouring the plating assistant agent; the plating assistant agent comprises the following components in parts by weight: 12 parts of zinc phytate, 5 parts of borax, 18 parts of oxalic acid and 180 parts of water;
(4) hot galvanizing: preheating a workpiece by a continuous annealing furnace, attaching liquid zinc by passing through a zinc pot with dissolved zinc, blowing flat airflow by an air knife to scrape redundant zinc liquid back to the zinc pot, and controlling the thickness of a zinc layer;
(5) cooling the workpiece to 40 ℃ by water quenching, hoisting the workpiece into a passivation tank by a crane for passivation treatment, wherein the temperature of the passivation solution is normal temperature, and the passivation time is 50 s; the passivation solution comprises the following components in parts by weight: 2.5 parts of sulfuric acid, 2.5 parts of phosphoric acid, 5 parts of nitric acid, 45 parts of hydrogen peroxide, 18 parts of sodium silicate, 1.2 parts of polymaleic anhydride, 1.2 parts of polyvinyl alcohol, 0.8 part of inositol hexaphosphate and 500 parts of water;
(6) and (5) drying the surface of the workpiece in a dryer, and then performing surface oiling treatment.
Comparative example 2
A hot galvanizing method comprises the following steps:
(1) preparing raw materials: hoisting a cold-rolled steel plate onto a material receiving platform by using a crane, dragging the steel plate onto an uncoiler by using an coiling trolley, rotating the uncoiler to introduce a strip head into a straight head machine to straighten the strip head so as to facilitate strip threading operation, then, feeding the strip head into an inlet shear to perform head cutting operation, after the previous strip steel is threaded, positioning a strip tail to the inlet shear, then, performing strip tail cutting operation, and welding the previous strip tail and a new strip head by using an off machine;
(2) cleaning and derusting: cleaning oil stain on the surface of the workpiece with clean water, removing rust on the surface of the workpiece with hydrochloric acid for 70min, cleaning the workpiece with clean water, and detecting to ensure that the pH value of the surface of the workpiece is in the range of 6-8;
(3) plating assistance: completely immersing the workpiece into the plating assistant agent until the workpiece does not bubble in the plating assistant agent, lifting the workpiece out and completely pouring the plating assistant agent; the plating assistant agent comprises the following components in parts by weight: 12 parts of zinc phytate, 5 parts of borax, 12 parts of sodium fluoride, 18 parts of oxalic acid and 180 parts of water;
(4) hot galvanizing: preheating a workpiece by a continuous annealing furnace, attaching liquid zinc by passing through a zinc pot with dissolved zinc, blowing flat airflow by an air knife to scrape redundant zinc liquid back to the zinc pot, and controlling the thickness of a zinc layer;
(5) and (3) quenching the workpiece with water, cooling to 40 ℃, and then performing surface oiling treatment.
The surface hardness of the zinc coating of the plated parts prepared in examples 1 to 4 and comparative examples 1 to 2 was measured by nanoindentation technique, and the hardness and elastic modulus were measured, and the results of the measurements are shown in table 1:
TABLE 1
Note: represents P <0.05 compared to the example 1 group.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A hot galvanizing method is characterized by comprising the following steps:
(1) preparing raw materials: sequentially uncoiling, straightening, cutting head and tail and welding a to-be-plated part to prepare a to-be-processed part;
(2) cleaning and derusting: cleaning the surface of the workpiece with clean water, removing rust on the surface of the workpiece with hydrochloric acid for 60-90min, cleaning the workpiece with clean water, and detecting to make the pH value of the surface of the workpiece in the range of 6-8;
(3) plating assistance: completely immersing the workpiece into the plating assistant agent until the workpiece does not bubble in the plating assistant agent, lifting the workpiece out and completely pouring the plating assistant agent;
(4) hot galvanizing: preheating a workpiece by a continuous annealing furnace, attaching liquid zinc by passing through a zinc pot with dissolved zinc, blowing flat airflow by an air knife to scrape redundant zinc liquid back to the zinc pot, and controlling the thickness of a zinc layer;
(5) cooling the workpiece to 38-45 ℃ by water quenching, hoisting the workpiece into a passivation tank by a crane for passivation treatment, wherein the temperature of the passivation solution is normal temperature, and the passivation time is 30-60 s;
(6) and (5) drying the surface of the workpiece in a dryer, and then performing surface oiling treatment.
2. The hot galvanizing method according to claim 1, wherein the workpiece is a cold-rolled steel sheet.
3. The hot galvanizing method according to claim 1, wherein the raw material preparation operation comprises: hoisting a cold-rolled steel plate to a receiving platform by a crane, hauling the steel plate to an uncoiler by an coiling trolley, rotating the uncoiler to introduce a belt head into a straight head machine to straighten the belt head so as to facilitate the belt threading operation, then feeding the belt head into an inlet shear to perform the head cutting operation, positioning the belt tail to the inlet shear after the previous belt steel strip is fed, then performing the belt tail shearing operation, and welding the previous belt tail and a new belt head by an off-line machine.
4. The hot galvanizing method according to claim 1, wherein the plating assistant agent comprises the following components in parts by weight: 10-15 parts of zinc phytate, 3-8 parts of borax, 10-15 parts of sodium fluoride, 15-20 parts of oxalic acid and 260 parts of water.
5. The hot galvanizing method according to claim 1, characterized in that the passivation solution consists of the following components in parts by weight: 1.5-3.5 parts of sulfuric acid, 1.5-3.5 parts of phosphoric acid, 3-6 parts of nitric acid, 40-50 parts of hydrogen peroxide, 15-20 parts of sodium silicate, 0.5-1.5 parts of polymaleic anhydride, 0.5-1.5 parts of polyvinyl alcohol, 0.5-1.2 parts of inositol hexaphosphate and 600 parts of water 400-.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114657493A (en) * | 2022-05-05 | 2022-06-24 | 河北华熙管业有限公司 | Corrosion-resistant galvanized steel pipe and production method thereof |
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