A zinc-based composite coating with rapid repair ability and its preparation method and application

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

Active Publication Date: 2021-05-11
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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  • A zinc-based composite coating with rapid repair ability and its preparation method and application
  • A zinc-based composite coating with rapid repair ability and its preparation method and application
  • A zinc-based composite coating with rapid repair ability and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Preparation of Zn-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 / 1mlDI water, take 20mg graphene oxide and ultrasonically disperse in 100mlDI water, prepare the graphene oxide dispersion liquid that pH is 4.0;

[0037] (2) In the graphene oxide dispersion in (1), add 20 g of spherical aluminum powder with a particle size of 10 to 30 μm, stir until the solution is clear, filter the solution, and obtain a reduced graphene oxide-coated aluminum with a 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 washed with ethanol in (3) and then vacuum-dry it at 50° C. for 8 hours to obtain dry re...

Embodiment 2

[0043] Example 2 Preparation of Zn-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 / 1mlDI water, 40mg graphene oxide is ultrasonically dispersed in 200mlDI water, and the pH of the prepared dispersion is 4.0 graphene oxide dispersion;

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

Embodiment 3

[0053] Example 3 Preparation of Zn-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 / 1mlDI water, 60mg graphene oxide is ultrasonically dispersed in 300mlDI water, and the pH of the prepared dispersion is 4.0 graphene oxide dispersion;

[0056] (2) In the graphene oxide dispersion in (1), add 20 g of spherical aluminum powder with a particle size of 10 to 30 μm, stir until the solution is clear, filter the solution, and obtain a concentration of 0.3 wt% reduced graphene oxide coated aluminum 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 repair ability, a preparation method and application thereof. The zinc-based composite coating includes reduced graphene oxide coated aluminum powder and zinc powder, which is deposited on the surface of the substrate by cold spraying, and the reduced graphene oxide is uniformly dispersed on the zinc-aluminum two-phase interface. The thickness of the composite coating is 0.05-1 mm. The composite coating of the invention has lower electrode potential, can quickly generate a stable corrosion product layer when the coating is complete, reduces the consumption rate of the coating, and prolongs the protection period of the coating. When the coating is damaged and the substrate is exposed, the coating and the substrate form a primary battery and act as an anode to form cathodic protection for the substrate, quickly generating dense corrosion products to fill the defects of the coating, preventing the corrosive medium from damaging the substrate, and can be applied In the field of cathodic 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 Patents(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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