Waterborne coating structure coating layer with high salt spray resistance

A water-based coating, salt spray-resistant technology, applied in coatings, anti-corrosion coatings, devices for coating liquids on surfaces, etc. Salt spray performance, small thickness effect

Active Publication Date: 2019-06-18
运研材料科技(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Dacromet was born in the late 1950s. American scientist Mike Martin developed a high-dispersion water-soluble paint based on metal zinc flakes and adding aluminum flakes, chromic acid, and deionized water as solvents. On the metal substrate, it is made by fully closed-circuit cycle coating and baking, and the salt spray resistance effect is better, but the disadvantage is that the energy consumption is still high and the processing cost is high
In recent years, environmentally friendly chromium-free zinc-aluminum coatings have been developed, such as Japan's Jiumet, Germany's Delken, etc., but they all require multiple layers of repeated coating to achieve the desired effect, resulting in high energy consumption. slightly thicker
[0003] In the prior art, although there are also technologies that use silane film to prevent the substrate from being corroded by salt spray, the disadvantage is that the corrosion resistance effect needs to be improved

Method used

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  • Waterborne coating structure coating layer with high salt spray resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1.1 A water-based paint structural coating with high salt spray resistance, the water-based paint structural coating includes:

[0061] The silane film coated on the iron sheet substrate, this silane is mercaptopropyltrimethoxysilane, its thickness is 50nm,

[0062] Coating the chromium-free zinc-aluminum coating on the above-mentioned silane film, the coating liquid used to form the chromium-free zinc-aluminum coating is composed of the following components by weight: 25 parts of zinc powder, 5 parts of aluminum powder, wetting and dispersing 22 parts of agent PEG2000, 2 parts of passivating agent sodium phosphomolybdate, 3 parts of corrosion inhibitor sodium molybdate, 26 parts of water, 7 parts of film-forming agent KH560 and 0.8 part of thickener hydroxyethyl cellulose, the thickness of which is 3 μm, and

[0063] The silane film coated on the chrome-free zinc-aluminum coating, the silane is mercaptopropyltrimethoxysilane, has a thickness of 50 nm.

[0064] 1.2 Th...

Embodiment 2

[0073] 2.1 A water-based paint structural coating with high salt spray resistance, the water-based paint structural coating includes:

[0074] The silane film that is coated on the iron sheet substrate, this silane is two-[3-(triethoxy silicon)-propyl]-tetrasulfide, the thickness of this silane film is 80nm,

[0075] Coating the chromium-free zinc-aluminum coating on the above-mentioned silane film, the coating liquid used to form the chromium-free zinc-aluminum coating is composed of the following components by weight: 25 parts of zinc powder, 5 parts of aluminum powder, wetting and dispersing 22 parts of PEG2000 agent, 2 parts of passivating agent sodium phosphomolybdate, 3 parts of corrosion inhibitor sodium molybdate, 26 parts of water, 7 parts of film forming agent KH560 and 0.8 part of thickener hydroxyethyl cellulose. The thickness of the coating is 5 μm, and

[0076] A silane film coated on the chrome-free zinc-aluminum coating, the silane is 3-aminopropyltriethoxysil...

Embodiment 3

[0088] The water-based paint structural coating prepared by the above-mentioned examples and comparative examples is tested for corrosion resistance under the following conditions: test by GB / T10125: sodium chloride mass concentration: (5 ± 0.5)%, pH value is 6.5~7.2 , the amount of fog falling is 1~2mL / (h·cm 2 ), the nozzle pressure is 78.5~137.3kPa (0.8~1.4kgf / cm 2 ). The corrosion resistance performance obtained from the test is shown in Table 1.

[0089] Table 1:

[0090] Example

[0091] It can be seen from Table 1 that the structural coating formed by sequentially coating silane film, chromium-free zinc-aluminum coating and silane film on the iron sheet substrate can achieve neutral salt spray resistance much longer than that of the single coating on the iron sheet substrate. The sum of the neutral salt spray resistance time achieved when a single layer of chromium-free zinc-aluminum coating is coated on a layer of silane film and an iron sheet substrate.

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Abstract

The invention discloses a waterborne coating structure coating layer with high salt spray resistance, and a preparation method thereof. The waterborne coating structure coating layer comprises a silane film applied to a substrate, a chromium-free zinc-aluminum coating layer applied to the silane film, and a silane film applied to the chromium-free zinc-aluminum coating layer. The waterborne coating structure coating layer with high salt spray resistance has the advantages of strong synergistic effects, simple structure, low processing energy consumption and high salt spray resistance.

Description

technical field [0001] The invention relates to a coating, in particular to a water-based paint structural coating with high salt spray resistance. Background technique [0002] Dacromet was born in the late 1950s. American scientist Mike Martin developed a high-dispersion water-soluble paint based on metal zinc flakes and adding aluminum flakes, chromic acid, and deionized water as solvents. On the metal substrate, it is made by coating and baking in a fully closed circuit, and the salt spray resistance effect is better, but the disadvantage is that the energy consumption is still high and the processing cost is high. In recent years, environmentally friendly chromium-free zinc-aluminum coatings have been developed, such as Japan's Jiumet, Germany's Delken, etc., but they all require multiple layers of repeated coating to achieve the desired effect, resulting in high energy consumption. Slightly thicker. [0003] In the prior art, although there are technologies that use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/08C09D1/00C09D5/10C09D183/06B05D5/00B05D1/38B05D7/14B05D7/24B05D1/02B05D1/18
Inventor 潘仕荣周小三马永龙
Owner 运研材料科技(上海)有限公司
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