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Method for preparing coating with metal surface corrosion inhibition and self-repair functions

A metal surface, metal corrosion inhibitor technology, applied in anti-corrosion coatings and other directions, can solve problems such as environmental pollution, carcinogenic side effects, etc., achieve the effects of less environmental pollution, enhanced corrosion inhibition performance, and prevention of the infiltration of corrosive media

Inactive Publication Date: 2009-12-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And as the research found that the chromate corrosion inhibitors widely used in industry have strong carcinogenic side effects, causing great pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Preparation of functional particles:

[0027] (1) SiO with a mass fraction of 2% and a particle size of 85nm 2The particle water dispersion was uniformly mixed with a 3 mg / ml polyallyl ammonium chloride (PAH, molecular weight: 56,000) solution, left to stand for 15 minutes, centrifuged, and washed three times with ultrapure water;

[0028] (2) Uniformly mix 3 mg / ml phytic acid (Pa, molecular weight: 660) solution with the aqueous dispersion of particles obtained in step (1), let stand for 15 min, centrifuge, and wash with ultrapure water three times. At this time, SiO 2 The particle surface is coated with polycationic PAH and phytic acid self-assembled bilayer film;

[0029] (3) Repeat steps (1) and (2), and finally adsorb a layer of PAH on the outermost layer, so that the outermost layer of the particles is a polyelectrolyte layer, reducing the spontaneous penetration of corrosion inhibitor molecules into the coating and the direct contact with the coating. possible...

example 2

[0036] Preparation of functional particles:

[0037] (1) SiO with a mass fraction of 2% and a particle size of 105nm 2 The aqueous particle dispersion was uniformly mixed with 5 mg / ml polyethyleneimine (PEI, molecular weight 750,000) solution, allowed to stand for 15 minutes, centrifuged, and washed three times with ultrapure water;

[0038] (2) Uniformly mix 2 mg / ml phytic acid (Pa, molecular weight: 660) solution with the aqueous dispersion of particles obtained in step (1), let stand for 15 min, centrifuge, and wash with ultrapure water three times. At this time, SiO 2 The particle surface is coated with polycationic PEI and phytic acid self-assembled double-layer film;

[0039] (3) Repeat steps (1) and (2), and finally adsorb a layer of PEI on the outermost layer, so that the outermost layer of the particles is a polyelectrolyte layer, reducing the spontaneous penetration of corrosion inhibitor molecules into the coating and the direct contact with the coating. possible...

example 3

[0044] Preparation of functional particles:

[0045] (1) SiO with a mass fraction of 5% and a particle size of 120nm 2 The particle water dispersion was uniformly mixed with a 3 mg / ml polyallyl ammonium chloride (PAH, molecular weight: 56,000) solution, left to stand for 15 minutes, centrifuged, and washed three times with ultrapure water;

[0046] (2) 5mg / ml of L-histidine (C 6 h 9 N 3 o 2 , the molecular weight is 155) solution and the water dispersion liquid of particle obtained in the previous step are uniformly mixed, left to stand for 15min, centrifuged, washed with ultrapure water three times, at this moment, SiO 2 The particle surface is coated with polycationic PAH and L-histidine self-assembled bilayer membrane;

[0047] (3) Repeat steps (1) and (2) once, and finally adsorb a layer of PAH on the outermost layer, so that the outermost layer of the particles is a polyelectrolyte layer, reducing the spontaneous penetration of corrosion inhibitor molecules into the ...

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Abstract

The invention belongs to the field of anticorrosion materials, and relates to a green and environment-friendly method for protecting metal from corroding, which can particularly control metal corrosion for long time effectively, and play a role in self-repairing the metal surface to a certain extent. The method is characterized in that an inhibitor molecule and polyelectrolyte are alternately deposited on the surface of a silicon dioxide nano-particle through green environment-friendly type metal inhibitor micromolecules and polyelectrolyte by adopting layer-by-layer self-assembly technology and utilizing the penetrating controllability of a polyelectrolyte self-assembly membrane so as to prepare a functional nano-particle with the inhibitor and the polyelectrolyte self-assembly composite membrane which are coated on the surface; and the prepared functional nano-particle is mixed with sol-gel to prepare the functional sol-gel membrane coated on the metal surface to be protected. The coating has the function of metal surface self-repairing, and ensures that the inhibitor molecules released by the functional membrane are adsorbed on the metal surface to reform a protecting membrane in a coating damaged microsection to play a certain role in self repairing. The method is applicable to corrosion protection of various metals.

Description

Technical field: [0001] The invention belongs to the field of anti-corrosion materials, and in particular relates to a green and environment-friendly metal anti-corrosion method, which can effectively control metal corrosion for a long time and play a certain role in metal surface self-repair. Background technique: [0002] Corrosion of metals has caused huge losses to society, and people have been seeking various ways to minimize metal corrosion for a long time. At present, the main ways to control corrosion include adding oxidants, anodic protection, or alloying to form a passivation film on the metal surface; by covering the metal surface with an organic or inorganic coating to prevent external corrosive media from contacting the metal surface under the paint film. Avoid metal corrosion; use electrochemical protection, such as applying an external current to shift the potential of the protected metal to the corrosion-free area or passivation area, to reduce the corrosion ...

Claims

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Application Information

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IPC IPC(8): C09D5/08
Inventor 李立东唐馥
Owner UNIV OF SCI & TECH BEIJING
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