CN113215512A - High-efficiency corrosion-resistant aluminum-zinc-plated steel plate and preparation method thereof - Google Patents
High-efficiency corrosion-resistant aluminum-zinc-plated steel plate and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 75
- 239000010959 steel Substances 0.000 title claims abstract description 75
- 238000005260 corrosion Methods 0.000 title claims abstract description 72
- 230000007797 corrosion Effects 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title abstract description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 40
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000011701 zinc Substances 0.000 claims abstract description 33
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 23
- 238000007747 plating Methods 0.000 claims abstract description 22
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000007670 refining Methods 0.000 claims abstract description 5
- 239000013078 crystal Substances 0.000 claims abstract description 4
- 239000003822 epoxy resin Substances 0.000 claims description 35
- 229920000647 polyepoxide Polymers 0.000 claims description 35
- 230000002708 enhancing effect Effects 0.000 claims description 24
- 238000002161 passivation Methods 0.000 claims description 24
- 238000000137 annealing Methods 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 21
- 229920001187 thermosetting polymer Polymers 0.000 claims description 21
- 238000005536 corrosion prevention Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 238000004132 cross linking Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
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- 239000007789 gas Substances 0.000 claims description 5
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- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000003755 preservative agent Substances 0.000 claims description 3
- 230000002335 preservative effect Effects 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 7
- 230000001070 adhesive effect Effects 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 7
- 125000001931 aliphatic group Chemical group 0.000 description 6
- 229920000768 polyamine Polymers 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910001297 Zn alloy Inorganic materials 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- 229910001335 Galvanized steel Inorganic materials 0.000 description 4
- 239000008397 galvanized steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052684 Cerium Inorganic materials 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 2
- 229910052777 Praseodymium Inorganic materials 0.000 description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 2
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 2
- 229910018137 Al-Zn Inorganic materials 0.000 description 1
- 229910018573 Al—Zn Inorganic materials 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- 229910052773 Promethium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- -1 aluminum-iron-silicon-zinc Chemical compound 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 description 1
- OHSVLFRHMCKCQY-UHFFFAOYSA-N lutetium atom Chemical compound [Lu] OHSVLFRHMCKCQY-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
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- 230000000149 penetrating effect Effects 0.000 description 1
- VQMWBBYLQSCNPO-UHFFFAOYSA-N promethium atom Chemical compound [Pm] VQMWBBYLQSCNPO-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 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
- 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
- C23C2/12—Aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
-
- 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
-
- 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
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- 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
Abstract
The invention discloses a high-efficiency corrosion-resistant aluminum-zinc-plated steel plate and a preparation method thereof, wherein the high-efficiency corrosion-resistant aluminum-zinc-plated steel plate comprises a steel plate base layer and an aluminum-zinc-plated layer positioned on the surface of the steel plate base layer, and the aluminum-zinc-plated layer comprises the following components: 54-57 wt% of Al, 42-45 wt% of Zn, 1.5-1.7 wt% of Si and 0.1-0.2 wt% of rare earth element Re, wherein the rare earth element Re is used for improving the surface wettability of the steel plate and refining crystal grains in the structure of the aluminum-zinc plated layer; the invention ensures that the anti-corrosion enhanced film layer has good adhesive force on the surface of the aluminized zinc layer, powerfully solves the problems of poor adhesive force of the traditional aluminized zinc layer on the steel plate base layer and easy generation of pinhole-shaped plating leakage surface defects, obviously improves the anti-corrosion performance and the mechanical strength of the aluminized zinc layer steel plate, does not need to change the hot plating process route of the aluminized zinc layer, and has simple implementation process and convenient production operation.
Description
Technical Field
The invention relates to the field of steel plate manufacturing, in particular to a high-efficiency corrosion-resistant aluminum-zinc-plated steel plate and a preparation method of the high-efficiency corrosion-resistant aluminum-zinc-plated steel plate.
Background
With the development of science and technology, steel manufacturing products are gradually updated, and hot galvanizing products are widely applied to the fields of industry, agriculture and construction. The hot-dip aluminum-zinc product has been widely popularized and applied at home and abroad due to the excellent corrosion resistance.
Compared with the traditional galvanized steel sheet, the whole structure of the galvanized steel sheet is a compact quaternary crystal formed by aluminum-iron-silicon-zinc, so that a barrier for effectively preventing corrosion factors from penetrating is formed, and the galvanized steel sheet has more excellent corrosion resistance and good heat resistance, can be used in a high-temperature environment and has the same high-temperature oxidation resistance as that of the galvanized steel sheet.
However, the applicant finds that in the actual manufacturing of the existing aluminum-zinc-plated steel plate, due to the fact that the 55% Al-Zn alloy molten liquid in the aluminum-zinc-plated melting pot has poor wettability with the steel plate, the adhesion and the continuity of a plating layer are directly affected, the defect of pinhole-shaped plating leakage is easily generated, and the corrosion resistance of the aluminum-zinc-plated steel plate is further affected.
In addition, in recent years, light steel buildings are increasingly increased, the characteristics of energy conservation, environmental protection, light dead weight, strong wind resistance, short construction period and strong living practicability meet the requirements of consumers, and the demand of the building market for the coating steel plate with higher corrosion resistance is gradually increased in the future.
Therefore, the applicant of the present invention has desired to improve the technical problems of the alzn-plated steel sheet.
Disclosure of Invention
In view of the above, the present invention provides an efficient corrosion-resistant aluminum-zinc plated steel sheet and a preparation method thereof, which ensure that an anti-corrosion enhanced film layer has a good adhesion on the surface of an aluminum-zinc plated layer, powerfully solve the problems of poor adhesion of a traditional aluminum-zinc plated layer on a steel sheet base layer and easy generation of pinhole-shaped plating-missing surface defects, significantly improve the corrosion resistance and mechanical strength of the aluminum-zinc plated steel sheet, and the application does not need to change a hot-dip plating process route of the aluminum-zinc plated layer, and has a simple implementation process and convenient production operation.
The technical scheme adopted by the invention is as follows:
the utility model provides a high-efficient corrosion resistance aluminized zinc layer steel sheet, includes steel sheet basic unit and the aluminized zinc layer that is located steel sheet basic unit surface, the composition on aluminized zinc layer includes: 54-57 wt% of Al, 42-45 wt% of Zn, 1.5-1.7 wt% of Si, and 0.1-0.2 wt% of Rare Earth element Re (which is an abbreviation of Rare Earth), and the Rare Earth element Re is used for improving the surface wettability of the steel plate and refining grains in the aluminum-plated zinc layer structure.
Preferably, the composition of the aluminum-zinc-plated layer comprises: 55 wt% of Al, 43.4 wt% of Zn, 1.6 wt% of Si, and 0.1-0.2 wt% of rare earth element Re.
Preferably, the thickness of the aluminum-zinc-plated layer is 30-60 microns.
Preferably, the surface of the aluminum-plated zinc layer is provided with an anti-corrosion enhanced film layer, wherein the anti-corrosion enhanced liquid adopted by the anti-corrosion enhanced film layer comprises 50-60 wt% of passivation solution, 20-35 wt% of thermosetting epoxy resin, 1-3 wt% of epoxy resin curing agent and 8-25 wt% of zinc powder.
Preferably, the thickness of the corrosion protection enhancing film layer is in the range of 10-30 microns.
Preferably, the anticorrosion enhancing liquid is coated on the steel plate base layer with the aluminum-zinc plated layer, and under the heating environment with the temperature range of 170-180 ℃, the moisture in the passivation liquid is volatilized, and meanwhile, the thermosetting epoxy resin and the epoxy resin curing agent are subjected to a crosslinking curing reaction to form the anticorrosion enhancing film layer.
Preferably, the average particle size of the zinc powder is in the range of 3 to 5 micrometers.
Preferably, the rare earth element Re referred to herein may be specifically lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu).
Preferably, the preparation method of the high-efficiency corrosion-resistant aluminum-zinc-plated steel plate comprises the following steps: carrying out surface cleaning, annealing, aluminum and zinc plating, cooling, finishing, straightening and surface corrosion prevention enhancement and passivation treatment on the steel plate base layer; wherein the annealing operation comprises the following steps: and (3) conveying the cleaned steel plate base layer into an annealing furnace, wherein the dew point temperature in the annealing furnace is controlled to be not more than-40, and the concentration of hydrogen in the injected gas into the annealing furnace is not less than 35%.
Preferably, the plating solution used in the aluminum-zinc plated layer adopts alloy melt composed of 54-57 wt% of Al, 42-45 wt% of Zn, 1.5-1.7 wt% of Si, and 0.1-0.2 wt% of rare earth element Re, and the aluminum-zinc plated layer is obtained through a hot plating process.
Preferably, the operation steps of the surface anticorrosion enhancing passivation treatment comprise:
s10), preparing a preservative enhancing liquid in advance: premixing thermosetting epoxy resin, an epoxy resin curing agent and zinc powder, and then uniformly mixing the premixed material with a passivation solution to obtain an anticorrosion reinforcing solution;
s20), uniformly coating the anti-corrosion enhancement solution obtained in the step S10) on the surface of the aluminum-zinc-plated layer by a coating roller;
s30), placing the steel plate coated with the anticorrosion enhancing liquid in an oven, setting the heating temperature range of the oven at 170-180 ℃, and heating for 3-6 minutes to volatilize the moisture in the passivation liquid and simultaneously enable the thermosetting epoxy resin and the epoxy resin curing agent to generate a crosslinking curing reaction to form the anticorrosion enhancing film layer.
The applicant surprisingly finds that the rare earth element Re is further added into the existing aluminum-zinc alloy melt, the surface wettability of a steel plate can be obviously improved, and grains in the structure of an aluminum-zinc layer can be refined, so that the aluminum-zinc layer can have good adhesive force on a steel plate base layer, and further stable and reliable anti-corrosion effect on the steel plate base layer can be ensured, and meanwhile, the applicant also considers that the aluminum-zinc layer added with the rare earth element Re is relatively weak in mechanical strength, the application further creatively provides an anti-corrosion enhancement film layer with special components, and the anti-corrosion enhancement liquid adopted by the anti-corrosion enhancement film layer comprises 50-60 wt% of passivation liquid, 20-35 wt% of thermosetting epoxy resin, 1-3 wt% of epoxy resin curing agent and 8-25 wt% of zinc powder; in practical application, thermosetting epoxy resin and a curing agent thereof are subjected to a crosslinking curing reaction to obtain a crosslinking curing film layer so as to realize mechanical protection of the aluminum-zinc plated layer, the curing film layer has excellent corrosion resistance by adding zinc powder, and a conventional passivation solution is used as a basic component, so that an anti-corrosion enhanced film layer with excellent mechanical property and corrosion resistance is formed, and the anti-corrosion enhanced film layer has good affinity with the aluminum-zinc plated layer positioned in the middle, so that the anti-corrosion enhanced film layer has good adhesive force on the surface of the aluminum-zinc plated layer, the problems of poor adhesive force of the traditional aluminum-zinc plated layer on a steel plate base layer and easy generation of pinhole-shaped plating leakage surface defects are powerfully solved, the corrosion resistance and the mechanical strength of the aluminum-zinc plated steel plate are obviously improved, and the hot plating process route of the aluminum-zinc plated layer is not required to be changed, the implementation process is simple and convenient for production operation.
Drawings
FIG. 1 is a schematic structural view of an aluminum-zinc plated steel sheet 10 having high corrosion resistance according to an embodiment of the present invention;
FIG. 2 is an enlarged view of the structure at A in FIG. 1;
FIG. 3 is a block diagram of the operation steps of the surface corrosion protection enhancement passivation treatment according to the embodiment of the present invention.
Detailed Description
The embodiment of the invention discloses a high-efficiency corrosion-resistant aluminum-zinc-plated steel plate, which comprises a steel plate base layer and an aluminum-zinc-plated layer positioned on the surface of the steel plate base layer, wherein the aluminum-zinc-plated layer comprises the following components: 54-57 wt% of Al, 42-45 wt% of Zn, 1.5-1.7 wt% of Si and 0.1-0.2 wt% of rare earth element Re, and the rare earth element Re is used for improving the surface wettability of the steel plate and refining crystal grains in the structure of the aluminum-zinc plated layer.
The embodiment of the invention also discloses a preparation method of the high-efficiency corrosion-resistant aluminum-zinc-plated steel plate, which comprises the following preparation procedures: carrying out surface cleaning, annealing, aluminum and zinc plating, cooling, finishing, straightening and drawing, and surface corrosion prevention enhancement passivation treatment on the steel plate base layer; wherein the annealing operation comprises the following steps: and (3) conveying the cleaned steel plate base layer into an annealing furnace, controlling the dew point temperature in the annealing furnace to be not more than-40, and controlling the concentration of hydrogen in the injected gas into the annealing furnace to be not less than 35%.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, a high-efficiency corrosion-resistant alzn-plated steel sheet 10 includes a steel sheet base layer 11 and an alzn-plated layer 12 on the surface of the steel sheet base layer 11, wherein the alzn-plated layer 12 includes: 54-57 wt% of Al, 42-45 wt% of Zn, 1.5-1.7 wt% of Si, and 0.1-0.2 wt% of rare earth element Re (particularly preferably lanthanum La, cerium Ce, praseodymium Pr and neodymium Nd are adopted), and the rare earth element Re is used for improving the surface wettability of the steel plate base layer 11 and refining grains in the structure of the aluminum-zinc-plated layer 12; specifically, in the present embodiment, the composition of the alzincium plating layer 12 includes: the thickness of the aluminum-zinc-plated layer 12 with 55 wt% of Al, 43.4 wt% of Zn, 1.6 wt% of Si and 0.1-0.2 wt% of rare earth element Re is 30-60 microns, and the aluminum-zinc-plated steel plate with AZ150 specification can be prepared.
Preferably, in the present embodiment, the surface of the aluminum-zinc plated layer 12 is provided with an anti-corrosion enhancement film layer 13, wherein the anti-corrosion enhancement liquid used by the anti-corrosion enhancement film layer 13 comprises 50-60 wt% of passivation liquid (known material, available from direct market purchase, such as hexavalent chromium passivator or trivalent chromium passivator), 20-35 wt% of thermosetting epoxy resin (known material, available from direct market purchase), 1-3 wt% of known material of epoxy resin curing agent, available from direct market purchase, specifically aliphatic polyamine), and 8-25 wt% of zinc powder; further preferably, in the present embodiment; coating the anticorrosion enhancing liquid on a steel plate base layer with an aluminum-zinc plated layer, volatilizing moisture in the passivation liquid in a heating environment with the temperature range of 170-180 ℃, and simultaneously carrying out a crosslinking curing reaction on thermosetting epoxy resin and an epoxy resin curing agent to form an anticorrosion enhancing film layer 13;
preferably, in the present embodiment, the applicant suggests that the thickness of the corrosion protection enhancing film layer 13 is in the range of 10 to 30 micrometers; too low thickness of the film layer 13 is difficult to realize in process, and the corrosion resistance is relatively poor to enhance, while too high thickness of the film layer 13 causes waste of raw materials; preferably, to facilitate control of the thickness range of the corrosion protection enhancement film layer 13, the zinc powder has an average particle size in the range of 3 to 5 μm in this embodiment, and is also commercially available.
The present embodiment also proposes a method for manufacturing the high-efficiency corrosion-resistant alzn-plated steel sheet 10, which includes the steps of: carrying out surface cleaning, annealing, aluminum and zinc plating, cooling, finishing, straightening and surface corrosion prevention enhancement and passivation treatment on the steel plate base layer 11; wherein the annealing operation comprises the following steps: the cleaned steel plate base layer is sent into an annealing furnace, the dew point temperature in the annealing furnace is controlled to be not more than-40, the reaction between the essential substances in the protective gas injected into the annealing furnace and the plating bath is prevented, the negative influence on the aluminum-zinc plated layer 12 can be effectively avoided, and the concentration of hydrogen in the gas injected into the annealing furnace is not less than 35 percent (higher than that in the conventional hot-dip plating process).
Preferably, the composition of the plating solution used in the aluminum-zinc plated layer 12 in this embodiment is an alloy melt consisting of 55 wt% of Al, 43.4 wt% of Zn, 1.6 wt% of Si, and 0.1-0.2 wt% of Re, which is a rare earth element, and the aluminum-zinc plated layer 12 is obtained by a hot-dip plating process.
Preferably, in the present embodiment, the operation step of the surface corrosion prevention enhancement passivation treatment includes:
s10), preparing a preservative enhancing liquid in advance: premixing thermosetting epoxy resin, an epoxy resin curing agent and zinc powder, and then uniformly mixing the premixed material with a passivation solution to obtain an anticorrosion reinforcing solution;
s20), uniformly coating the anticorrosion enhancing liquid obtained in the step S10) on the surface of the aluminum-zinc-plated layer 12 through a coating roller;
s30), placing the steel plate coated with the anticorrosion enhancing liquid in an oven, setting the heating temperature range of the oven at 170-180 ℃, and heating for 3-6 minutes to volatilize the moisture in the passivation liquid and simultaneously enable the thermosetting epoxy resin and the epoxy resin curing agent to generate a crosslinking curing reaction to form the anticorrosion enhancing film layer.
The inventor of the present invention surprisingly found that by further adding a rare earth element Re to the existing aluminum-zinc alloy melt, it is found that the surface wettability of the steel plate can be significantly improved, and the grains in the structure of the aluminum-zinc alloy layer can be refined, so that the aluminum-zinc alloy layer 12 can have a good adhesion on the steel plate base layer 11, and further ensure that a stable and reliable anti-corrosion effect is achieved on the steel plate base layer 11, and meanwhile, the inventor also considers that the aluminum-zinc alloy layer after adding the rare earth element Re is relatively weak in mechanical strength, the embodiment further creatively provides an anti-corrosion enhancement film layer 13 having a special component, wherein the anti-corrosion enhancement liquid adopted by the anti-corrosion enhancement film layer comprises 50-60 wt% of a passivation solution, 20-35 wt% of a thermosetting epoxy resin, 1-3 wt% of an epoxy resin curing agent, and 8-25 wt% of a zinc powder; in practical application, the thermosetting epoxy resin and the curing agent thereof are subjected to a crosslinking curing reaction to obtain a crosslinking curing film layer so as to realize mechanical protection of the aluminum-plated zinc layer, the curing film layer has excellent corrosion resistance by adding zinc powder, and a conventional passivation solution is used as a basic component, so that an anti-corrosion enhanced film layer 13 with excellent mechanical property and corrosion resistance is formed, the anti-corrosion enhanced film layer 13 has good affinity with the aluminum-plated zinc layer 12 positioned in the middle, the anti-corrosion enhanced film layer 13 has good adhesive force on the surface of the aluminum-plated zinc layer 12, the problems of poor adhesive force of the traditional aluminum-plated zinc layer 12 on the steel plate base layer 11 and easy generation of pinhole-shaped plating-missing surface defects are powerfully solved, the corrosion resistance and the mechanical strength of the aluminum-plated zinc layer steel plate 1 are obviously improved, and the hot-plating process route of the aluminum-plated zinc layer 12 does not need to be changed, the implementation process is simple and convenient for production operation.
To further illustrate the technical effects of the present application, the following examples and comparative examples were specifically set forth and compared for corrosion resistance and mechanical properties:
example 1: the other technical solutions of this example 1 are the same as the above embodiment, wherein the adopted corrosion-prevention enhancing solution includes 60 wt% of trivalent chromium passivator, 20 wt% of thermosetting epoxy resin, 1 wt% of aliphatic polyamine curing agent, and 19 wt% of zinc powder.
Example 2: the other technical solutions of this embodiment 2 are the same as the above embodiment, wherein the adopted corrosion-prevention enhancing solution comprises 55 wt% of trivalent chromium passivator, 30 wt% of thermosetting epoxy resin, 2 wt% of aliphatic polyamine curing agent, and 13 wt% of zinc powder.
Example 3: the other technical solutions of this embodiment 3 are the same as the above embodiment, wherein the adopted corrosion-prevention enhancing solution comprises 50 wt% of hexavalent chromium passivator, 35 wt% of thermosetting epoxy resin, 3 wt% of aliphatic polyamine curing agent, and 12 wt% of zinc powder.
Example 4: the other technical solutions of this example 4 are the same as the above embodiment, wherein the adopted corrosion-prevention enhancing solution includes 54 wt% of trivalent chromium passivator, 35 wt% of thermosetting epoxy resin, 3 wt% of aliphatic polyamine curing agent, and 8 wt% of zinc powder.
Example 5: the other technical solutions of this example 5 are the same as the above embodiment, wherein the adopted corrosion-prevention enhancing solution includes 50 wt% of trivalent chromium passivator, 23 wt% of thermosetting epoxy resin, 2 wt% of aliphatic polyamine curing agent, and 25 wt% of zinc powder.
Example 6: the remaining technical solutions of this example 6 are the same as the above implementation technical solutions, wherein this example is not provided with an anticorrosion reinforcing film layer.
Comparative example: the remaining technical solution of the comparative example is the same as that of example 1, except that in the comparative example, the plating bath composition used therein is not added with the rare earth element Re.
The alnico coated steel sheets obtained in examples 1 to 6 and comparative example 1 were subjected to comparative tests for corrosion resistance and mechanical properties, and the test results are shown in table 1 below:
TABLE 1 comparison of the working results of the examples of the present application with the comparative examples
The impact resistance test in the embodiment is based on the test standard ISO 6272-1-2011; the acid-resistant salt spray is based on the test standard of; GB/T2423.17-2008.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a high-efficient corrosion resistance aluminized zinc layer steel sheet, includes steel sheet basic unit and the aluminized zinc layer that is located steel sheet basic unit surface, its characterized in that, the composition on aluminized zinc layer includes: 54-57 wt% of Al, 42-45 wt% of Zn, 1.5-1.7 wt% of Si and 0.1-0.2 wt% of rare earth element Re, and the rare earth element Re is used for improving the surface wettability of the steel plate and refining crystal grains in the structure of the aluminum-zinc plated layer.
2. The high efficiency corrosion resistant alzinciferous coated steel sheet according to claim 1, wherein the composition of the alzinciferous coating comprises: 55 wt% of Al, 43.4 wt% of Zn, 1.6 wt% of Si, and 0.1-0.2 wt% of rare earth element Re.
3. The high efficiency corrosion resistant alzinciferous coated steel sheet according to claim 1, wherein the alzinciferous coating has a thickness of 30 to 60 μm.
4. The high-efficiency corrosion-resistant aluminum-zinc-plated steel plate as claimed in claim 1 or 2, wherein the surface of the aluminum-zinc-plated layer is provided with a corrosion-resistant reinforced film layer, wherein the corrosion-resistant reinforced solution adopted by the corrosion-resistant reinforced film layer comprises 50-60 wt% of passivation solution, 20-35 wt% of thermosetting epoxy resin, 1-3 wt% of epoxy resin curing agent and 8-25 wt% of zinc powder.
5. The high efficiency corrosion resistant aluminum-zinc coated steel sheet according to claim 1, wherein the thickness of the corrosion prevention enhancing film layer is in the range of 10 to 30 μm.
6. The high-efficiency corrosion-resistant aluminum-zinc-plated steel plate as claimed in claim 1, wherein the corrosion-resistant reinforcing solution is coated on the steel plate substrate with the aluminum-zinc-plated layer, and under the heating environment with the temperature range of 170-180 ℃, the water in the passivation solution is volatilized, and simultaneously the thermosetting epoxy resin and the epoxy resin curing agent are subjected to a cross-linking curing reaction to form the corrosion-resistant reinforcing film layer.
7. The high-efficiency corrosion-resistant aluminum-zinc-plated steel sheet according to claim 1, wherein the zinc powder has an average particle size in the range of 3 to 5 μm.
8. A method for manufacturing a high-efficiency corrosion-resistant aluminum-zinc-plated steel sheet according to any one of claims 1 to 7, characterized by comprising the steps of: carrying out surface cleaning, annealing, aluminum and zinc plating, cooling, finishing, straightening and surface corrosion prevention enhancement and passivation treatment on the steel plate base layer; wherein the annealing operation comprises the following steps: and (3) conveying the cleaned steel plate base layer into an annealing furnace, wherein the dew point temperature in the annealing furnace is controlled to be not more than-40, and the concentration of hydrogen in the injected gas into the annealing furnace is not less than 35%.
9. The production method according to claim 8, wherein the composition of the plating solution used in the aluminum-zinc plated layer is an alloy melt consisting of 54 to 57 wt% of Al, 42 to 45 wt% of Zn, 1.5 to 1.7 wt% of Si, and 0.1 to 0.2 wt% of a rare earth element Re, and the aluminum-zinc plated layer is obtained by a hot-dip plating process.
10. The method of claim 8, wherein the step of applying a surface corrosion protection enhancing passivation treatment comprises:
s10), preparing a preservative enhancing liquid in advance: premixing thermosetting epoxy resin, an epoxy resin curing agent and zinc powder, and then uniformly mixing the premixed material with a passivation solution to obtain an anticorrosion reinforcing solution;
s20), uniformly coating the anti-corrosion enhancement solution obtained in the step S10) on the surface of the aluminum-zinc-plated layer by a coating roller;
s30), placing the steel plate coated with the anticorrosion enhancing liquid in an oven, setting the heating temperature range of the oven at 170-180 ℃, and heating for 3-6 minutes to volatilize the moisture in the passivation liquid and simultaneously enable the thermosetting epoxy resin and the epoxy resin curing agent to generate a crosslinking curing reaction to form the anticorrosion enhancing film layer.
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Application publication date: 20210806 |