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Zinc-based composite coating with rapid repairing capability as well as preparation method and application thereof

A composite coating, zinc-based technology, used in transportation and packaging, metal processing equipment, pressure inorganic powder coating, etc., can solve problems such as poor self-healing ability, achieve strong rapid repair ability, strong cathodic protection, no Effects of undesirable phase formation

Active Publication Date: 2019-08-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-pressure cold spraying is a kind of cold spraying technology. It refers to the spraying technology with a spraying pressure of 0.5-1Mpa. Due to the low spraying pressure, the requirements for equipment are relatively high. Coatings with higher plasticity, such as Zn, Al, etc., domestic researchers have successfully prepared Zn-Al composite coatings on the steel surface by cold spraying method, which has good cathodic protection effect, but poor self-healing ability

Method used

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  • Zinc-based composite coating with rapid repairing capability as well as preparation method and application thereof
  • Zinc-based composite coating with rapid repairing capability as well as preparation method and application thereof
  • Zinc-based composite coating with rapid repairing capability as well as preparation method and application thereof

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Effect test

Embodiment 1

[0034] The preparation of embodiment 1Zn-0.1wt%rGo / Al coating

[0035] 1. Prepare rGo / Al powder with a concentration of 0.1wt% by in-situ reduction method, and the preparation steps are as follows:

[0036] (1) according to the concentration of 0.2mg graphene oxide / 1ml DI water, take 20mg graphene oxide and ultrasonically disperse in 100ml DI water, prepare the graphene oxide dispersion liquid that pH is 4.0;

[0037] (2) Add 20g of spherical aluminum powder with a particle size of 10-30um to the graphene oxide dispersion in (1), stir until the solution is clear, filter the solution, and obtain a reduced graphene oxide-coated aluminum concentration of 0.1 wt%. pink;

[0038] (3) Transfer the reduced graphene oxide-coated aluminum powder obtained in (2) to the ethanol solution, and magnetically stir for 3 minutes;

[0039] (4) Filter the reduced graphene oxide-coated aluminum powder cleaned with ethanol in (3) and then vacuum-dry it at 50° C. for 8 hours to obtain dry reduced...

Embodiment 2

[0043] The preparation of embodiment 2Zn-0.2wt%rGo / Al coating

[0044] 1. Prepare rGo / Al powder with a concentration of 0.2wt% by in-situ reduction method, and the preparation steps are as follows:

[0045] (1) According to the concentration of 0.2mg graphene oxide / 1ml DI water, take 40mg graphene oxide and ultrasonically disperse it in 200ml DI water, the pH of the prepared dispersion is 4.0 graphene oxide dispersion;

[0046] (2) In the graphene oxide dispersion in (1), add 20g of spherical aluminum powder with a particle size of 10-30um, stir until the solution is clear, filter the solution, and obtain a reduced graphene oxide coating with a concentration of 0.2wt%. aluminum powder;

[0047] (3) Transfer the reduced graphene oxide-coated aluminum powder obtained in (2) to the ethanol solution, and magnetically stir for 3 minutes;

[0048] (4) Filter the reduced graphene oxide-coated aluminum powder washed with ethanol in (3), and vacuum-dry at 50° C. for 8 hours to obtain...

Embodiment 3

[0053] The preparation of embodiment 3Zn-0.3wt%rGo / Al coating

[0054] 1. Prepare rGo / Al powder with a concentration of 0.3wt% by in-situ reduction method, and the preparation steps are as follows:

[0055] (1) According to the concentration of 0.2mg graphene oxide / 1ml DI water, 40mg graphene oxide is ultrasonically dispersed in 300ml DI water, and the pH of the prepared dispersion is 4.0 graphene oxide dispersion;

[0056] (2) Add 20g of spherical aluminum powder with a particle size of 10-30um to the graphene oxide dispersion in (1), stir until the solution is clear, filter the solution, and obtain a reduced graphene oxide-coated aluminum concentration of 0.3wt% pink;

[0057] (3) Transfer the reduced graphene oxide-coated aluminum powder obtained in (2) to the ethanol solution, and magnetically stir for 3 minutes;

[0058] (4) Filter the reduced graphene oxide-coated aluminum powder washed with ethanol in (3), and vacuum-dry at 50° C. for 8 hours to obtain dry reduced gra...

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Abstract

The invention belongs to the technical field of metal surface treatment, and discloses a zinc-based composite coating with rapid repairing capability as well as a preparation method and application thereof. The zinc-based composite coating is prepared through the following steps that reduced graphene oxide coated aluminum powder and zinc powder are adopted, a cold spraying method is adopted for deposit a feed on the surface of a substrate, and reduced graphene oxide is uniformly dispersed in the zinc-aluminum phase interface. The thickness of the zinc-based composite coating is 0.05-1 mm. Thecomposite coating has lower electrode potential, a stable corrosion product layer can be quickly generated when the coating is complete, the consumption rate of the coating is reduced, and the protection life of the coating is prolonged. When the coating is damaged and the substrate is exposed, the coating and the substrate form an original battery to serve as an anode to form cathode protection on the substrate, so that a compact corrosion product can be quickly generated to fill a defect of the coating, so that a corrosion medium is prevented from damaging the substrate, and the coating canbe applied to the field of cathode protection of carbon steel.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and more specifically relates to a zinc-based composite coating with rapid repair ability and its preparation method and application. Background technique [0002] The corrosion protection of metal can be considered from the design of the material itself, the improvement of the corrosion environment, the preparation of the surface anti-corrosion coating and the electrochemical protection. The anti-corrosion coating on the metal surface protects the substrate through a variety of mechanisms. The main protection mechanisms are: forming a barrier to prevent the penetration of corrosive agents and providing a surface layer with high ionic resistivity to minimize the interface between the coating and the metal coating. Under the electrochemical reaction, the active coating has the ability to store, release and deliver corrosion inhibitors to defects, as well as cathodic protection. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04B22F1/02C23F13/12
CPCC23C24/04C23F13/12B22F1/16
Inventor 吴惠舒詹浩芝张留艳吕晓罗军平揭晓华
Owner GUANGDONG UNIV OF TECH
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