Waterborne anti-corrosive coating and preparation method thereof

A water-based technology for anti-corrosion coatings, applied in anti-corrosion coatings, coatings, etc., can solve the problems of low coating hardness, poor corrosion resistance, low porosity, etc., and achieve high matrix bonding force, good wear resistance, and good plasticity Effect

Inactive Publication Date: 2017-05-31
ZHEJIANG JIENENG AUTOMOBILE PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a water-based zinc-aluminum coating, which has significant advantages compared with the existing chrome-free zinc-aluminum coating, aiming at the shortcomings of existing chromium-free zinc-aluminum coatings such as low coating hardness, poor corrosion resistance, and pores. Increased hardness and corrosion resistance, and low porosity

Method used

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  • Waterborne anti-corrosive coating and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0012] A water-based anti-corrosion coating and its preparation method: preparation of component A mixture: first add 30% zinc-aluminum alloy powder (comprising 25% zinc powder, 4.4% aluminum powder and 0.6% silver powder) to 8% alcohol solution and stir 5min, then add 6% emulsifier and stir for 5min, then add 0.6% defoamer and stir for 5min, then add 0.1% thickener and stir for 5min; prepare component B mixture: add 0.9% micronized calcium oxide Slowly added to 15% deionized water and stirred for 15 minutes, then added 15% silane coupling agent and stirred for 5 minutes. Slowly pour the mixed solution of component A into the mixed solution of component B and stir for 15 minutes; add the rest of deionized water and stir for 15 minutes to obtain a water-based anti-corrosion coating.

[0013] The water-based anti-corrosion coating prepared in this example, the obtained coating is tested: the coating thickness is 25 ± 10 μm, the hardness is 5H, the adhesion is 4 grades, the salt ...

Embodiment 2

[0015] A water-based anti-corrosion coating and its preparation method: prepare the A-component mixture: first add 25% zinc-aluminum alloy powder (comprising 21% zinc powder, 3.8% aluminum powder and 0.2% silver powder) to 12% alcohol solution and stir 5min, then add 5% emulsifier and stir for 5min, then add 0.7% defoamer and stir for 5min, then add 0.2% thickener and stir for 5min; prepare component B mixture: add 0.6% micronized calcium oxide Slowly added to 12% deionized water and stirred for 15 min, then added 15% silane coupling agent and stirred for 5 min. Slowly pour the mixed solution of component A into the mixed solution of component B and stir for 15 minutes; add the rest of deionized water and stir for 15 minutes to obtain a water-based anti-corrosion coating.

[0016] The water-based anti-corrosion coating prepared in this example, the obtained coating is tested: the coating thickness is 20 ± 6 μm, the hardness is 5H, the adhesion is 5 grades, the salt resistance ...

Embodiment 3

[0018] A water-based anti-corrosion coating and its preparation method: prepare the A-component mixture: first add 35% zinc-aluminum alloy powder (comprising 30% zinc powder, 4.2% aluminum powder and 0.8% silver powder) to 16% alcohol solution and stir 5min, then add 4% emulsifier and stir for 5min, then add 0.8% defoamer and stir for 5min, then add 0.2% thickener and stir for 5min; prepare component B mixture: add 0.8% micronized calcium oxide Slowly added to 15% deionized water and stirred for 15 minutes, then added 12% silane coupling agent and stirred for 5 minutes. Slowly pour the mixed solution of component A into the mixed solution of component B and stir for 15 minutes; add the rest of deionized water and stir for 15 minutes to obtain a water-based anti-corrosion coating.

[0019] The water-based anti-corrosion coating prepared in this example, the obtained coating is tested: the thickness of the coating is 21 ± 3 μm, the hardness is 6H, the adhesion is grade 5, the sa...

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Abstract

The invention discloses a waterborne anti-corrosive coating and a preparation method thereof. The waterborne anti-corrosive coating can provide anti-corrosive protection for automotive parts such as rivets, bolts, springs and the like of a substrate. A composition of the coating is generally a formula of mixture comprising a component A and a component B, and the components A and B are uniformly mixed when in use. According to 100% of mass parts in total, mixture A comprises 22-38% of zinc-aluminum alloy powder, 8-28% of alcohol, 1-6% of an emulsifying agent, 0-0.5% of a thickening agent and 0.6-1% of a defoaming agent; mixture B comprises 0.1-0.9% of micro-powder calcium oxide, 10-15% of a silane coupling agent and deionized water. Compared with the existing chrome-free zinc-aluminum coating, a coating formed by adopting the composition of the coating disclosed by the invention has the advantages that the hardness is improved, the salt fog resistance is improved, and the porosity is reduced.

Description

technical field [0001] The invention belongs to the technical field of metal surface anticorrosion coatings, and in particular relates to a water-based chrome-free zinc-aluminum coating composition and a preparation method thereof. Background technique [0002] Rivets, bolts, springs and other parts are the solid and connecting components of the various parts of the car, and their reliability is a crucial issue. The main cause of failure of rivets, bolts, springs and other components is corrosion damage. In the 1960s and 1970s, Dacromet coatings were developed abroad. The salient feature of Dacromet coating is that the lamination of flake zinc-aluminum powder in the coating plays the role of mechanical isolation and sacrificial anode; The compound forms a network structure with self-healing effect. Dacromet coatings have excellent anti-corrosion properties and are widely used in the surface protection of rivets, bolts, springs and other auto parts. However, as the laws a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/10C09D7/12
Inventor 刘俊旺张立军王永达张志刚
Owner ZHEJIANG JIENENG AUTOMOBILE PARTS
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