Metal-based self-repairing coating as well as preparation method and application thereof

A metal coating, self-healing technology, applied in coatings, electrolytic coatings, etc., can solve the problems of easy defects in metal and alloy coatings, and achieve the effect of improving the protection effect, prolonging the protection life, and improving the protection performance.

Inactive Publication Date: 2019-02-22
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical task of the present invention is to propose a metal-based self-repairing coating and its preparation method and application for the problem that the surface of the existing metal and alloy coating is prone to defects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A metal-based self-repairing coating of the invention is composed of a metal coating and a nano-container doped inside the metal coating. Among them, the nano-container uses mesoporous silica as a carrier, and the corrosion inhibitor molecule 8-hydroxyquinoline is loaded inside, and the surface is modified with acrylic acid polymer;

[0037] When the coating is corroded by external effects, the pH of the corrosion area changes. At this time, the nano-container responds to the change of pH, so that the 8-hydroxyquinoline molecules are automatically released, and a protective film is formed on the surface of the metal coating or the substrate to achieve the self-healing effect. .

[0038] In the present invention, the choice of the nano container carrier is not limited to mesoporous silica, but may also be mesoporous titania. One carrier can be used alone, or multiple carriers can be used in combination.

[0039] In the present invention, the selection of corrosion inhi...

Embodiment 2

[0041] A method for preparing a metal-based self-repairing coating of the present invention comprises the following steps:

[0042] 1) Weigh 0.5g of the corrosion inhibitor molecule 8-hydroxyquinoline, add it to 50mL of acetone solvent, put it into a beaker, stir it fully to dissolve it completely; then add 1.0g of mesoporous TiO 2 , after fully stirring, carry out negative pressure loading, the negative pressure is 0.4Mpa, the mesoporous TiO 2 The gas in the exhaust, the mesoporous TiO 2 The gas in the gas is fully discharged, and the corrosion inhibitor 8-hydroxyquinoline is loaded on the mesoporous TiO 2 middle.

[0043] 2) Put the nano-container carrying the corrosion inhibitor 8-hydroxyquinoline into a 50mL solution of 0.3mol / L acrylic acid polymer. The pores are fully blocked by the acrylic polymer, and the pH-responsive nanocontainers that can control the release of the corrosion inhibitor 8-hydroxyquinoline are prepared.

[0044] 3) Add the nanocontainer in step 2)...

Embodiment 3

[0047] A method for preparing a metal-based self-repairing coating of the present invention comprises the following steps:

[0048]1) Weigh 0.5g of the corrosion inhibitor molecule oleic acid, add it to 50mL of ethanol solvent, put it into a beaker, stir it fully to dissolve it completely; then add 0.25g of mesoporous SiO 2 , after fully stirring, carry out negative pressure loading, the negative pressure is 0.5Mpa, the mesoporous SiO 2 The gas in the exhaust, the mesoporous SiO 2 The gas in the gas is fully discharged, and the corrosion inhibitor oleic acid is loaded on the mesoporous SiO 2 middle.

[0049] 2) Put the nano-container carrying the corrosion inhibitor oleic acid into a 50mL, 0.2mol / L acrylic acid polymer solution, control the pH of the solution at 3, soak for a period of time, stir well, so that the micropores on the surface of the nano-container are fully covered The pH-responsive material is plugged, and the pH-responsive nanocontainer that can controlly re...

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PUM

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Abstract

The invention provides a metal-based self-repairing coating as well as a preparation method and application thereof, and belongs to the field of electrodeposition micro-nano composite coatings and self-repairing. The metal-based self-repairing coating is composed of a metal coating and a nano container doped in the metal coating, the nano container takes a mesoporous material as a carrier, corrosion inhibitor molecules are supported inside the nano container, and a pH response material is modified on the surface of the nano container. The method comprises the following steps that firstly, a corrosion inhibitor is supported in the nano container, then surface hole sealing treatment is performed on the nano container containing the corrosion inhibitor by adopting a solution with the pH response, then the nano container is further modified through a cationic surface modification solution to enable the surface to have the certain positive charge, finally, a metal electrodeposition solutionis prepared, the nano container which contains the corrosion inhibitor and is provided with the pH response is added into the electrodeposition solution, co-deposition is realized under the action ofcurrent, and the metal coating with a self-repairing function is prepared. According to the metal-based self-repairing coating as well as the preparation method and application thereof, the protective life of the metal coating can be effectively prolonged, and a new idea is provided for preparing the novel metal composite coating.

Description

technical field [0001] The invention relates to the field of electrodeposited micro-nano composite coating and self-repairing, in particular to a metal-based self-repairing coating and its preparation method and application. Background technique [0002] Metal and its alloy coatings have good physical, chemical and mechanical properties, such as high hardness, wear resistance and corrosion resistance, so they are widely used in the surface treatment of steel. However, due to the influence of various factors, defects such as pits and microcracks are prone to occur in the preparation process of the metal coating, resulting in a decrease in the corrosion resistance of the coating. [0003] The concept of self-healing provides an ideal way to solve the external trauma and internal defects of materials. By sensing and responding to the damage, it can repair the damage without affecting the overall performance of the system, which can ensure that the material is more reliable, sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00
CPCC25D15/00
Inventor 林志峰张伟许立坤
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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