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VCI-containing flake zinc and aluminum protective coating on galvanizing surface and preparation method thereof

A zinc-aluminum coating and flake technology, applied in coatings, anti-corrosion coatings, etc., can solve the problems of corrosion and damage of steel components, limited anti-corrosion life, easy oxidation of zinc layer, etc., to achieve enhanced adhesion, long service life, and coating gloss. Good results

Active Publication Date: 2011-09-28
天津中航百慕新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the thickness of the galvanized layer used for hot-dip galvanized steel components such as highway guardrails and power towers is generally about 80-120 μm, such galvanized components are used in areas with harsh corrosive environments such as coastal areas and chemical plants, and their service life is often less than 5 years, it will lead to corrosion and damage of steel components; in addition, because the zinc layer is extremely easy to oxidize, brand-new galvanized components will become dark and lose light within a few months of use.
In addition, for some thin galvanized sheets used in the automotive industry, cable tray industry, decoration industry and other fields, the overall thickness of the sheet is only 1 to 3mm; the thickness of the galvanized layer on the surface of the sheet is less than 20μm. In the ordinary outdoor atmospheric environment, the anti-corrosion life is extremely limited, so there is an urgent need for a coating that can be used in the field of galvanized steel structures. The coating has excellent adhesion to the galvanized layer of the plate, and it is not easy to crack and peel off when the plate is deformed.

Method used

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  • VCI-containing flake zinc and aluminum protective coating on galvanizing surface and preparation method thereof
  • VCI-containing flake zinc and aluminum protective coating on galvanizing surface and preparation method thereof
  • VCI-containing flake zinc and aluminum protective coating on galvanizing surface and preparation method thereof

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0061] Preparation of test panels

[0062] Unless otherwise specified, the test samples are usually hot-dip galvanized cold-rolled low-carbon sheets. The thickness of the galvanized coating is 10-15 μm. Before the board is coated, it is first immersed in a water-based cleaning agent to degrease it. The water-based cleaner is LCX-52. After degreasing, rinse the sample with water. Then, soak the sample with 2% HCl for 1-2 minutes. Remove the board, rinse it with water, and let it dry.

[0063] Coating of Test Parts

[0064] After mixing the two components of the alcohol-soluble (or water-based) VCI flake zinc-aluminum paint in proportion, spray the prepared paint on the above-mentioned prepared test sample board with an air spray gun. After spraying, let it dry naturally for at least two weeks, then carry out the following tests.

[0065] bending experiment

[0066] Achieved through the test procedures of ASTM-D522. Use a piece of tape coated with pressure-sensitive adh...

Embodiment 1

[0071] Embodiment 1 (preparation of alcohol-soluble VCI flake zinc-aluminum composite coating)

[0072] Preparation of component A: Add 100 grams each of scale-type zinc powder and scale-type aluminum powder with a thickness ≤ 0.2 μm and a diameter ≤ 20 μm, add to 100 mL, 95% ethanol and stir for more than 0.5 hours to fully mix the two. Add 2 grams of modified polysiloxane type leveling agent, 150 grams of polyvinyl butyral and 10 grams of cyclohexylamine nitrite, and stir for more than 0.5 hours until uniform.

[0073] Preparation of component B: Dissolve 160 g of alkyl silicate in 100 mL of 95% ethanol, stir well and mix evenly, add 2 g of organic bentonite, and stir evenly.

[0074] Before coating, mix the two components A and B and stir them evenly to obtain a finished silver-gray alcohol-soluble zinc-aluminum composite coating.

Embodiment 2

[0075] Embodiment 2 (preparation of alcohol-soluble VCI flake zinc-aluminum composite coating)

[0076] Preparation of component A: 180 grams each of flake-type zinc powder and flake-type aluminum powder with a thickness ≤ 0.4 μm and a diameter ≤ 40 μm are added to 200 mL of 95% n-butanol and stirred for more than 0.5 hours to fully mix the two Evenly, add 5 grams of leveling agent M, 200 grams of polyvinyl butyral and 20 grams of hexamethylenetetramine, and stir for more than 0.5 hours until uniform.

[0077] Preparation of component B: Dissolve 200 grams of alkyl silicate in 100 mL of 95% n-butanol, stir and mix well, add 10 grams of fumed silica, and stir evenly.

[0078] Before coating, the two components A and B are mixed and stirred evenly to obtain a silver-gray finished alcohol-soluble zinc-aluminum composite coating.

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Abstract

A squama aluminum-zinc protective coating used for the surface of zincing plates and containing VCI (Vapor corrosion inhibitor) is used for the pretreatment technology of the zincing plates. Besides, the invention also provides a VCI squama aluminum-zinc protective coating system on a zincing surface and prepared by the coating.

Description

technical field [0001] The present invention relates to a flaky zinc-aluminum protective coating containing VCI (Vapor Corrosion Inhibitor, vapor phase slow-release agent) for the surface of galvanized sheet materials, the coating is used for the pretreatment process of galvanized sheet materials, and the galvanized surface prepared thereby VCI flake zinc-aluminum protective coating system. Background technique [0002] Zinc-rich paint is the most widely used antirust primer in the field of steel structure corrosion protection and shop primer field. However, the zinc-rich coatings actually used in domestic and foreign projects all belong to spherical zinc coatings, that is, all use spherical zinc powder as a filler. In the nodular zinc coating, in order to pursue a high dry film zinc content to ensure the conductivity and service life of the coating, the addition of zinc powder in the slurry is as high as 80%. Adding such a large amount of zinc powder has greatly exceeded ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D129/14C09D5/10C23F11/00
Inventor 杨忠林杨振波郭万生张亮黄玖梅李运德师华于一川马振岭张军魏久桓
Owner 天津中航百慕新材料技术有限公司