CN113462216B - Gradual change type graphene zinc coating - Google Patents
Gradual change type graphene zinc coating Download PDFInfo
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- CN113462216B CN113462216B CN202110961549.7A CN202110961549A CN113462216B CN 113462216 B CN113462216 B CN 113462216B CN 202110961549 A CN202110961549 A CN 202110961549A CN 113462216 B CN113462216 B CN 113462216B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/042—Graphene or derivatives, e.g. graphene oxides
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Abstract
The invention discloses a graded graphene zinc coating, which adopts graphene and zinc with different amounts to form a plurality of coatings, wherein the first coating is contacted with a steel substrate, and by analogy, the last coating is contacted with a corrosive medium, the zinc content is gradually reduced from the first coating to the last coating to present a gradient, and by utilizing the advantages of large surface area and good conductivity of the nano graphene material, the nano graphene material is added into the zinc-containing coating to activate the cathode protection effect of a small amount of zinc in the coating, simultaneously improve the shielding and blocking performance of the coating on the corrosive medium, form a graded graphene zinc coating system with low surface density, gradually reduce the zinc content from inside to outside, maintain the effective cathode protection effect on the steel substrate, reduce the corrosion thermodynamic tendency of an outer coating, reduce the cost and the weight, and have obvious economic benefits.
Description
Technical Field
The invention belongs to the technical field of corrosion protection, and particularly relates to an organic or inorganic coating technology.
Background
The coating is one of the important means for corrosion protection of steel substrates, and the zinc-containing primer is a commonly used anti-corrosion primer. The corrosion potentials of zinc and mild steel in seawater are-1.10V and-0.7V, respectively, and when the zinc-containing primer and steel substrate are simultaneously exposed to a corrosive medium, the zinc-containing primer preferentially corrodes as an anode and the steel substrate is protected as a cathode because the corrosion potential of zinc is lower than that of the steel substrate. When the corrosion medium penetrates into the interface of the primer and the steel substrate, corrosion preferentially occurs in the zinc-containing primer, and the steel substrate is protected.
In order to interconnect the zinc dust in the zinc containing coating, the coating as a whole has a sufficiently low corrosion potential to maintain the protective effect on the steel substrate. The zinc content of the traditional zinc-rich primer dry film is not lower than 77%, the usage amount of zinc is extremely high, and the surface density of the coating is correspondingly high.
The corrosion potential of zinc is very low and corrosion is very likely to occur once it contacts a corrosive medium. In fact, the corrosion of zinc constitutes a protective effect on the steel substrate only if the corrosion medium penetrates the primer-steel substrate interface. Until then, the corrosion of zinc was ineffective in protecting the steel substrate and a significant amount of zinc powder in the coating was wasted.
The nano graphene material has large surface area and good conductivity, and the nano graphene material is added into the zinc-containing coating, so that the using amount of zinc in the coating can be reduced, the shielding and blocking performance of the coating on corrosive media is improved, and the coating has excellent corrosion resistance.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a graded graphene zinc coating, and in order to achieve the purpose, the invention adopts the following technical scheme.
A plurality of coatings are formed by adopting graphene and zinc with different contents, the first coating is contacted with a steel base material, the rest can be done in the same way, the last coating is contacted with a corrosive medium, and the zinc content is gradually reduced from the first coating to the last coating to present a gradient.
Further, the graphene in the coating is an individual or stacked carbon nanostructure.
Further, the number of coating layers is 2 to 5.
If the coating is 5 times, the zinc content is respectively more than 60% in the first time, 40% -60% in the second time, 20% -40% in the third time, 10% -20% in the fourth time and 5% -10% in the fifth time.
If the coating is 2-pass coating, the zinc content is respectively the zinc content of 2-pass coating in 5-pass coating, namely the first pass is more than 60%, the second pass is 40% -60%, or the first pass is more than 60%, the second pass is 20% -40%, or the first pass is more than 60%, the second pass is 10% -20%, or the first pass is more than 60%, the second pass is 5% -10%, or the first pass is 40% -60%, the second pass is 20% -40%, or the first pass is 40% -60%, the second pass is 10% -20%, or the first pass is 40% -60%, the second pass is 5% -10%, or the first pass is 20% -40%, the second pass is 10% -20%, or the first pass is 20% -40%, the second pass is 5% -10%, or the first pass is 10% -20%, and the second pass is 5% -10%.
By analogy, if the coating is 3 coatings, the zinc content is respectively the zinc content of 3 coatings in 5 coatings.
By analogy, if the coating is 4 coatings, the zinc content is the zinc content of 4 coatings in 5 coatings.
The invention has the beneficial effects that: by utilizing the advantages of large surface area and good conductivity of the nano graphene material, the nano graphene material is added into the zinc-containing coating, the cathode protection effect of a small amount of zinc in the coating is activated, the shielding and blocking performance of the coating on a corrosive medium is improved, a graded graphene zinc coating system with low areal density is formed, the content of zinc is gradually reduced from inside to outside, the graded graphene zinc coating system has obvious potential gradient, the potential of an inner layer is low, the electrochemical protection effect on a steel substrate is maximum, the potential of an outer layer is high, the corrosion thermodynamic tendency of the coating can be reduced, the corrosion thermodynamic tendency of the outer layer is reduced while the effective cathode protection effect on the steel substrate is maintained, the whole coating system has extremely high corrosion resistance, and meanwhile, the cost and the weight are reduced, so that the nano graphene zinc coating system has obvious economic benefits.
Drawings
FIG. 1 is a schematic diagram of 5 coating passes.
Detailed Description
The technical scheme of the invention is specifically explained in the following by combining the attached drawings.
The multi-layer coating formed by mixing the graphene with the zinc is shown in figure 1, the first coating is in contact with a steel substrate, the zinc content is more than 60%, the zinc content of the second coating is 40% -60%, and by analogy, the last coating is in contact with a corrosive medium, the zinc content is gradually reduced from the first coating to the last coating, and a gradient is formed.
The first coating is in 3.5% NaCl water solution, the self-corrosion potential is-1.1V to-1.0V, the self-corrosion potential of the steel base material is-0.7V, the first coating is in contact with the steel base material, the potential difference between the first coating and the steel base material is large, effective cathode protection effect is provided for the steel base material, the zinc content of the second coating and the subsequent coatings is gradually reduced, the thermodynamic corrosion tendency of the coating is reduced, the total thickness of the multiple coatings is consistent with that of the traditional zinc-rich coating with high zinc content, and the surface density of the coatings is reduced by 30% -50%.
The above-described embodiments are not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the present invention.
Claims (2)
1. A graded graphene zinc coating is characterized by comprising the following coatings: the coating is composed of 5 coatings formed by different amounts of graphene and zinc, wherein the first coating is contacted with a steel substrate, the last coating is contacted with a corrosive medium, and the zinc content is gradually reduced from the first coating to the last coating to present a gradient; the zinc content of the 5 coatings is respectively more than 60 percent of the first coating, 40-60 percent of the second coating, 20-40 percent of the third coating, 10-20 percent of the fourth coating and 5-10 percent of the fifth coating.
2. The graded graphene zinc coating according to claim 1, wherein the graphene in the coating is individual or stacked carbon nanostructures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110961549.7A CN113462216B (en) | 2021-08-20 | 2021-08-20 | Gradual change type graphene zinc coating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110961549.7A CN113462216B (en) | 2021-08-20 | 2021-08-20 | Gradual change type graphene zinc coating |
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| Publication Number | Publication Date |
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| CN113462216A CN113462216A (en) | 2021-10-01 |
| CN113462216B true CN113462216B (en) | 2022-12-27 |
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| CN114316637A (en) * | 2021-12-28 | 2022-04-12 | 南开大学 | Controllable preparation method of gradient composite membrane |
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| JP2021164996A (en) * | 2018-07-18 | 2021-10-14 | Ａｇｃ株式会社 | Method for manufacturing base material with coating film and base material with coating film |
| CN110041801B (en) * | 2019-04-08 | 2020-11-17 | 西安交通大学 | Preparation method of zinc-containing graphene epoxy anticorrosive paint |
| CN113150642A (en) * | 2020-12-30 | 2021-07-23 | 中国特种飞行器研究所 | Anticorrosive coating system for outer wall of tower cylinder of ocean wind turbine generator and coating method |
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