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Chromium-free Zn-Al coating and a chromium-free Zn-Al coating layer

A zn-al, coating technology, used in coatings, anti-corrosion coatings, etc., can solve the problems of poor corrosion resistance and low sintering curing temperature, and achieve the effects of low sintering temperature, improved corrosion resistance and energy saving

Inactive Publication Date: 2019-01-01
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a kind of chromium-free Zn-Al paint for overcoming the defect of the poor corrosion resistance of the chromium-free Zn-Al paint described in the above-mentioned prior art, the chromium-free Zn-Al paint of this chromium-free Zn-Al paint preparation It has the advantages of strong corrosion resistance and low sintering and curing temperature

Method used

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  • Chromium-free Zn-Al coating and a chromium-free Zn-Al coating layer
  • Chromium-free Zn-Al coating and a chromium-free Zn-Al coating layer
  • Chromium-free Zn-Al coating and a chromium-free Zn-Al coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] A chromium-free Zn-Al paint prepared by the following method:

[0079] S1. Preparation of component A with GPTMS:MTMS=1:1: First take 20g GPTMS and 20g MTMS respectively, then add 80g methanol and stir for 5 min with a magnetic stirrer, then add 80g deionized water, dropwise concentration is 10 % Acetic acid solution or 5% NaOH solution, adjust the pH of the hydrolysate to 4.5, and finally stir the hydrolysate in a magnetic stirrer for 6 hours (speed 500 r / min, temperature 30 ℃) to obtain component A;

[0080] S2. Preparation of component B: first take 23.33g of flake zinc powder and 4.67g of flake aluminum powder, then add 11.2g of ethylene glycol and 0.8g of surfactant (OP-10), stir evenly with a glass rod to obtain Component B;

[0081] S3. Mixing of component A and component B: Take 40g of component A and add it to the beaker of component B, then add 8g of dispersant (Tween-20) and thickener (hydroxyethyl cellulose ether) 0.4 g, 0.4g defoamer (polyether modified polydime...

Embodiment 2

[0085] The difference between this embodiment and embodiment 1 is that the ratio of the components of the silane coupling agent in this embodiment is GPTMS:MTMS=1:2, that is, 13.33g GPTMS and 26.67g MTMS;

[0086] The amount of other raw materials and operation steps are the same as in Example 1.

Embodiment 3

[0088] The difference between this embodiment and embodiment 1 is that the ratio of the components of the silane coupling agent in this embodiment is GPTMS:MTMS=2:1, that is, 26.67g GPTMS and 13.33g MTMS;

[0089] The amount of other raw materials and operation steps are the same as in Example 1.

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Abstract

Chromium-free Zn-Al coating and a chromium-free Zn-Al coating layer are disclosed. The coating includes an A component, a B component and an auxiliary agent. The A component includes a silane couplingagent, water and alcohol. The silane coupling agent includes gamma-glycidyloxypropyltrimethoxysilane and methyltrimethoxysilane. The B component includes flake zinc-aluminum powder, a dispersing solvent and a surfactant. The coating adopts the gamma-glycidyloxypropyltrimethoxysilane (GPTMS) and the methyltrimethoxysilane (MTMS) which are compounded as the silane coupling agent, and corrosion resistance of the coating is significantly superior to that of chromium-free Zn-Al coating adopting the MTMS or GPTMS as a silane coupling agent separately at present. The disclosed chromium-free Zn-Al coating has a low sintering temperature, thus effectively saving energy.

Description

Technical field [0001] The invention belongs to the field of metal anti-corrosion coatings, and more specifically, relates to a chromium-free Zn-Al coating and a chromium-free Zn-Al coating. Background technique [0002] Snow on the road brings inconvenience to traffic and even causes traffic accidents. The common method of removing snow from the road surface is salting. But as the snow melts, the chlorine in the snow can cause vehicle corrosion. Many technologies have been developed to overcome the corrosion of equipment components, including thermal spraying, electroplating, chemical conversion coatings, hop dipping, paint coatings, and thermosetting coatings. In coatings, Dacromet coatings have been used for many years since they were invented in the 1950s to improve the corrosion resistance of equipment components. For a long time, many countries have used Dacromet coating to inhibit vehicle corrosion. [0003] In the sintering process of Dacromet coatings containing Zn-Al-...

Claims

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Application Information

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IPC IPC(8): C09D5/10C09D183/06
CPCC08G77/14C08K2003/0812C08K2003/0893C09D5/103C09D5/106C09D183/06C08K7/00C08K3/08
Inventor 王冠宁岳林勾俊峰谢光荣黄江江
Owner GUANGDONG UNIV OF TECH
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