CN113293375A - Preparation method of guardrail with good corrosion resistance - Google Patents

Preparation method of guardrail with good corrosion resistance Download PDF

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Publication number
CN113293375A
CN113293375A CN202110499845.XA CN202110499845A CN113293375A CN 113293375 A CN113293375 A CN 113293375A CN 202110499845 A CN202110499845 A CN 202110499845A CN 113293375 A CN113293375 A CN 113293375A
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Prior art keywords
base material
weight
parts
zinc
guardrail
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CN202110499845.XA
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Chinese (zh)
Inventor
张湘华
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Foshan Jubang Guardrail Co ltd
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Foshan Jubang Guardrail Co ltd
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Priority to CN202110499845.XA priority Critical patent/CN113293375A/en
Publication of CN113293375A publication Critical patent/CN113293375A/en
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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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
    • C23C28/3225—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only with at least one zinc-based layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
    • B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/546—No clear coat specified each layer being cured, at least partially, separately
    • 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
    • C23C2/04—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
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
    • C23C22/36—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates
    • C23C22/368—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates containing magnesium cations
    • 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
    • C23C22/82—After-treatment
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2504/00—Epoxy polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2506/00—Halogenated polymers
    • B05D2506/10—Fluorinated polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2508/00—Polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2518/00—Other type of polymers
    • B05D2518/10—Silicon-containing polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2601/00—Inorganic fillers
    • B05D2601/20—Inorganic fillers used for non-pigmentation effect

Abstract

The invention relates to the technical field of guardrails, in particular to a preparation method of a guardrail with good corrosion resistance, which comprises the following steps: s1, preprocessing a base material; s2, hot dip galvanizing; s3, passivating and degreasing; s4, phosphating; s5, cleaning and drying the phosphatized base material, spraying a zinc-rich primer, spraying an outer decorative coating after curing, and then curing to obtain a semi-finished product; and S6, manufacturing the semi-finished product into a guardrail. According to the invention, after the base material of the guardrail is pretreated, the surface of the base material is sequentially coated with the zinc layer, the passivation layer, the zinc phosphating film, the zinc-rich primer and the outer decorative coating from inside to outside, so that the purpose of multilayer anticorrosion protection from inside to outside is achieved, the corrosion resistance of the base material of the guardrail is effectively improved, and the prepared guardrail has an excellent anticorrosion effect.

Description

Preparation method of guardrail with good corrosion resistance
Technical Field
The invention relates to the technical field of guardrails, in particular to a preparation method of a guardrail with good corrosion resistance.
Background
Guardrail, especially outdoor guardrail are in external environment such as solarization and rain for a long time, and current guardrail anticorrosion effect is not good, and easy rust corrosion influences guardrail protective effect.
Disclosure of Invention
The invention aims to provide a preparation method of a guardrail with good corrosion resistance aiming at the prior technical situation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a guardrail with good corrosion resistance comprises the following steps:
s1, base material pretreatment: carrying out rust removal treatment on a base material after eddy current flaw detection and straightening, wherein the base material is made of steel;
in eddy current flaw detection, a metal material is used as a test object to be tested, an alternating current is supplied from an alternating current power supply to an excitation coil, an eddy current is induced in the vicinity of the surface of the test object, and a reaction magnetic field generated by the eddy current is detected by a detection coil. If a defect exists near the surface of the object, the flow of eddy current changes due to the defect, and the intensity and distribution of the reaction magnetic field generated by the eddy current also change, so that the presence or absence of the defect can be detected. The substrate can be screened in the early stage through eddy current inspection, so that the substrate with crack defects on the surface and the near surface is prevented from being mixed, and the anti-corrosion effect of the guardrail is prevented from being influenced.
The straightening in step S1 includes straightening the base material in the left-right direction and straightening in the front-back direction by the straightening machine.
The base material is straightened before hot dip galvanizing, passivation and other processing, so that the surface of the base material is regular, the corrosion resistant layer is prevented from being damaged by straightening after the corrosion resistant processing, and meanwhile, the corrosion resistant layers are more closely attached to the regular surface of the base material, and the corrosion resistant effect is improved.
S2, hot dip galvanizing, namely soaking the base material subjected to rust removal treatment in molten zinc liquid at about 400-600 ℃ to ensure that a zinc layer is attached to the surface of the base material, so as to play a role in electrochemical protection and prevent the steel base material from rusting from inside to outside;
s3, passivation and degreasing: cooling the base material subjected to hot dip galvanizing treatment, passivating, and forming a compact passivation protective film on the surface of the base material to form a second protective layer, so that the anti-corrosion effect is further improved, and degreasing treatment is performed;
s4, phosphating treatment: cleaning the degreased base material, and then immersing the degreased base material into zinc phosphating solution to form a phosphating film on the surface of the base material; the phosphating film provides anti-corrosion protection for the base material, and simultaneously can enhance the binding force between the follow-up base material and the zinc-rich primer so as to ensure that the follow-up coating can achieve better anti-corrosion capability.
S5, cleaning and drying the phosphatized base material, spraying a zinc-rich primer, spraying an outer decorative coating after curing, and then curing to obtain a semi-finished product; in the present invention, the outer coating layer is preferably a fluorocarbon coating or a silicon-modified polyester resin coating having excellent weather resistance.
The zinc-rich primer can provide long-term corrosion resistance and impact resistance, and further increase the corrosion resistance of the base material.
And S6, manufacturing the semi-finished product into guardrails with different specifications and shapes according to requirements.
According to the invention, after the base material of the guardrail is pretreated, the surface of the base material is sequentially coated with the zinc layer, the passivation layer, the zinc phosphating film, the zinc-rich primer and the outer decorative coating from inside to outside, so that the purpose of multilayer anticorrosion protection from inside to outside is achieved, the corrosion resistance of the base material of the guardrail is effectively improved, and the prepared guardrail has an excellent anticorrosion effect.
Preferably, the zinc phosphating solution comprises, by weight, 30-80 parts of zinc dihydrogen phosphate; 1-5 parts of sodium fluoride; 5-20 parts by weight of calcium nitrate; 1-5 parts by weight of nickel nitrate; 3-5 parts of cobalt nitrate; 3-8 parts by weight of magnesium nitrate; 0.5-3 parts by weight of sodium hexametaphosphate; 0.5-3 parts by weight of sodium tripolyphosphate; 0.1 to 1.5 parts by weight of potassium hexafluorophosphate.
The sodium fluoride and potassium hexafluorophosphate replace the traditional hydrofluoric acid, and the protection performance of the phosphating film can be improved.
According to the invention, the compound of calcium nitrate, nickel nitrate, cobalt nitrate and magnesium nitrate is introduced into the zinc phosphating solution, so that the grain size and the intercrystalline distance of a phosphating film can be greatly reduced, the phosphating film with fine grains is formed on the surface of a base material, and meanwhile, a micro sodium hexametaphosphate and sodium tripolyphosphate compound are combined to be beneficial to forming a microcrystalline film, and the two are combined with each other, so that the formed phosphating film has better compactness, and the microcrystalline and corrosion-resistant effects are better.
Tests show that compared with the zinc phosphating solution only added with any one of calcium nitrate, nickel nitrate, cobalt nitrate and magnesium nitrate in the compound, the zinc phosphating solution added with the compound has smaller grain size of a phosphating film and prolongs the salt spray resistant time by 20-50%.
The zinc phosphating solution comprises, by weight, 60 parts of zinc dihydrogen phosphate; 1 part by weight of sodium fluoride; 15 parts by weight of calcium nitrate; 2 parts of nickel nitrate; 3 parts of cobalt nitrate; 5 parts by weight of magnesium nitrate; 0.5 part by weight of sodium hexametaphosphate; 0.5 part by weight of sodium tripolyphosphate; 0.8 part by weight of potassium hexafluorophosphate.
Preferably, the zinc-rich primer is graphene-modified epoxy zinc-rich paint or graphene-modified silicate zinc-rich paint, and graphene is added into the zinc-rich primer, so that the salt spray resistance, impact resistance and hardness of the coating can be effectively improved, a better cathode protection effect is achieved, and the protection capability of the coating is remarkably improved.
The invention has the beneficial effects that:
1) according to the invention, after the base material of the guardrail is pretreated, the surface of the base material is sequentially coated with the zinc layer, the passivation layer, the zinc phosphating film, the zinc-rich primer and the outer decorative coating from inside to outside, so that the purpose of multilayer anticorrosion protection from inside to outside is achieved, the corrosion resistance of the base material of the guardrail is effectively improved, and the prepared guardrail has an excellent anticorrosion effect.
2) According to the invention, the compound of calcium nitrate, nickel nitrate, cobalt nitrate and magnesium nitrate is introduced into the zinc phosphating solution, so that the grain size and the intercrystalline distance of a phosphating film can be greatly reduced, the phosphating film with fine grains is formed on the surface of a base material, and meanwhile, a micro sodium hexametaphosphate and sodium tripolyphosphate compound are combined to be beneficial to forming a microcrystalline film, and the two are combined with each other, so that the formed phosphating film has better compactness, and the microcrystalline and corrosion-resistant effects are better.
Detailed Description
The invention is further illustrated by the following examples:
example 1
A preparation method of a guardrail with good corrosion resistance comprises the following steps:
s1, base material pretreatment: carrying out rust removal treatment on a base material after eddy current flaw detection and straightening, wherein the base material is made of steel;
s2, hot dip galvanizing, namely soaking the base material subjected to rust removal treatment in molten zinc liquid at about 400-600 ℃ to ensure that a zinc layer is attached to the surface of the base material;
s3, passivation and degreasing: cooling the base material subjected to hot dip galvanizing treatment, and then passivating and degreasing the base material;
s4, phosphating treatment: cleaning the degreased base material, and then immersing the degreased base material into zinc phosphating solution to form a phosphating film on the surface of the base material;
s5, cleaning and drying the phosphatized base material, spraying a zinc-rich primer, wherein the zinc-rich primer can be graphene modified epoxy zinc-rich paint or graphene modified silicate zinc-rich paint, spraying an outer decorative coating after curing, and then curing to obtain a semi-finished product;
and S6, manufacturing the semi-finished product into a guardrail according to the requirement.
Example 2
The difference between the embodiment and the embodiment 1 is that the zinc phosphating solution comprises, by weight, 30-80 parts of zinc dihydrogen phosphate; 1-5 parts of sodium fluoride; 5-20 parts by weight of calcium nitrate; 1-5 parts by weight of nickel nitrate; 3-5 parts of cobalt nitrate; 3-8 parts by weight of magnesium nitrate; 0.5-3 parts by weight of sodium hexametaphosphate; 0.5-3 parts by weight of sodium tripolyphosphate; 0.1 to 1.5 parts by weight of potassium hexafluorophosphate.
Example 3
The difference between the embodiment and the embodiment 1 is that the zinc phosphating solution comprises the following components in parts by weight, namely 60 parts by weight of zinc dihydrogen phosphate; 1 part by weight of sodium fluoride; 15 parts by weight of calcium nitrate; 2 parts of nickel nitrate; 3 parts of cobalt nitrate; 5 parts by weight of magnesium nitrate; 0.5 part by weight of sodium hexametaphosphate; 0.5 part by weight of sodium tripolyphosphate; 0.8 part by weight of potassium hexafluorophosphate.
The technical principles of the present invention have been described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive step, which shall fall within the scope of the present invention.

Claims (5)

1. A preparation method of a guardrail with good corrosion resistance is characterized by comprising the following steps:
s1, base material pretreatment: carrying out rust removal treatment on a base material after eddy current flaw detection and straightening, wherein the base material is made of steel;
s2, hot dip galvanizing, namely soaking the base material subjected to rust removal treatment in molten zinc liquid at about 400-600 ℃ to ensure that a zinc layer is attached to the surface of the base material;
s3, passivation and degreasing: cooling the base material subjected to hot dip galvanizing treatment, and then passivating and degreasing the base material;
s4, phosphating treatment: cleaning the degreased base material, and then immersing the degreased base material into zinc phosphating solution to form a phosphating film on the surface of the base material;
s5, cleaning and drying the phosphatized base material, spraying a zinc-rich primer, spraying an outer decorative coating after curing, and then curing to obtain a semi-finished product;
and S6, manufacturing the semi-finished product into a guardrail.
2. The method for manufacturing the guardrail with excellent corrosion resistance as claimed in claim 1, wherein the zinc phosphating solution comprises, by weight, 30-80 parts of zinc dihydrogen phosphate; 1-5 parts of sodium fluoride; 5-20 parts by weight of calcium nitrate; 1-5 parts by weight of nickel nitrate; 3-5 parts of cobalt nitrate; 3-8 parts by weight of magnesium nitrate; 0.5-3 parts by weight of sodium hexametaphosphate; 0.5-3 parts by weight of sodium tripolyphosphate; 0.1 to 1.5 parts by weight of potassium hexafluorophosphate.
3. The method for manufacturing a guardrail with excellent corrosion resistance as claimed in claim 2, wherein the zinc phosphating solution comprises, by weight, 60 parts of zinc dihydrogen phosphate; 1 part by weight of sodium fluoride; 15 parts by weight of calcium nitrate; 2 parts of nickel nitrate; 3 parts of cobalt nitrate; 5 parts by weight of magnesium nitrate; 0.5 part by weight of sodium hexametaphosphate; 0.5 part by weight of sodium tripolyphosphate; 0.8 part by weight of potassium hexafluorophosphate.
4. The method for preparing the guardrail with good corrosion resistance as claimed in claim 1, wherein the zinc-rich primer is graphene-modified epoxy zinc-rich paint or graphene-modified silicate zinc-rich paint.
5. The method for manufacturing a guardrail excellent in corrosion resistance according to claim 1, wherein the straightening in step S1 comprises straightening the base material in the left-right direction and straightening in the front-rear direction by a straightening machine.
CN202110499845.XA 2021-05-08 2021-05-08 Preparation method of guardrail with good corrosion resistance Pending CN113293375A (en)

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Citations (6)

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