Chromium-free waterborne corrosion resistant coating used for surface of metal and preparation method thereof

An anti-corrosion coating, metal surface technology, applied in anti-corrosion coatings, coatings and other directions, can solve the problems of environmental and human injury, the decline of corrosion resistance of coatings, etc., to save foreign exchange, improve salt spray resistance, reduce electrode potential Effect

Active Publication Date: 2010-04-14
CHANGZHOU JMT SURFACE ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional dacromet solution coating contains hexavalent chromium in the coating. When it is used, the hexavalent chromium will be decomposed when it meets water, which will reduce the corrosion resistance of the coating and cause harm to the environment and human body.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] ① Prepare the raw materials according to the specific formula in Table 1:

[0028] Table 1

[0029] components

Raw material name, specification

Dosage, mass%

Flake Zinc Powder

15-18μm long, 0.1-0.2μm thick

22

Flake aluminum powder

15-18μm long, 0.1-0.2μm thick

5

solvent

Dipropylene glycol

13.5

Auxiliary

Emulsifier

D

TX-10

JFC

1.5

1.0

The first silane coupling agent

Si-69

18

The second silane coupling agent

A-174

6

nano-SiO 2

Particle size 7~12nm

0.24

Nano-TiO 2

Particle size 10~20nm;

0.12

Nano-ZrO 2

Particle size 9~20nm

0.10

silver salt

AgNO 3

0.60

polyaniline

polyaniline

0.18

Tackifier

HEC

0

water

Top up to 100

[0030] Note: TX-10 is the product brand of nonylphenol polyoxyethylene ether nonionic emulsifier p...

Embodiment 2

[0038] ① Prepare the raw materials according to the specific formula in Table 2:

[0039] Table 2

[0040] components

Raw material name, specification

Dosage, mass%

Flake Zinc Powder

15-18μm long, 0.1-0.2μm thick

25

Flake aluminum powder

15-18μm long, 0.1-0.2μm thick

5

solvent

Isopropylene glycol

18

Auxiliary

Emulsifier

D

TX-10

polyethylene glycol

0.6

0.8

The first silane coupling agent

Si-69

22

The second silane coupling agent

KH-550

3

nano-SiO 2

Particle size 7~12nm

0.12

Nano-TiO 2

Particle size 10~20nm;

0.08

Nano-ZrO 2

Particle size 9~20nm

0.10

silver salt

AgNO 3

0.60

polyaniline

polyaniline

0.24

Tackifier

HEC

0.35

water

Top up to 100

[0041] Note: KH-550 is the brand name of γ-aminopropyltriethoxysilane produced by ...

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Abstract

The invention relates to a chromium-free waterborne corrosion resistant coating for the surface of metal and a preparation method thereof. The chromium-free waterborne corrosion resistant coating comprises the following components in percentage by mass: 15-33 flaked zinc powder, 2.5-8 flaked aluminium powder, 13.5-24 solvent, 0.2-2.5 assistant, 14-22 first silane coupling agent, 2-6 second silane coupling agent, 0.05-1.5 nano SiO2,0.03-1.2 nano TiO2, 0.02-1.5 nano ZrO2, 0.3-1 silver salt, 0.1-0.3 polyaniline, 0-0.6 tackifier and the balance of H2O, wherein the first silane coupling agent is a bi-[Gamma-(triethoxysilane) propyl] tetrasulfide; and the second silane coupling agent is a Gamma-aminopropyltriethoxysilane or Gamma-methacryloxypropyl trimethoxysilane. The coating contains no chromium and has corrosion resistance according with an international newest metal surface corrosion prevention technology.

Description

technical field [0001] The invention relates to a chromium-free water-based anti-corrosion coating for metal surfaces and a preparation method thereof. Background technique [0002] The traditional dacromet solution coating contains hexavalent chromium in the coating, and the hexavalent chromium will be decomposed when it meets water, which will reduce the corrosion resistance of the coating and cause harm to the environment and human body. European 2000 / 53 / EG stipulates that from July 1, 2003, the content of hexavalent chromium in each car produced and sold in Europe shall not exceed 2 grams. Therefore, a kind of green environmental protection technology has been developed abroad and is called Geomet technology for short. But it has been monopolized by international multinational companies. In order to make domestic cars go abroad, it is urgent to develop a coating product with independent intellectual property rights and performance comparable to Geomet technology. Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D5/10C09D7/12
Inventor 张建平
Owner CHANGZHOU JMT SURFACE ENG TECH
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