Self-cleaning super-hydrophobic conversion film on metal matrix, preparation method and film-forming agent of self-cleaning super-hydrophobic conversion film

A metal substrate and conversion film technology, applied in the direction of metal material coating process, etc., can solve the problems of passive film not self-healing, restricting large-scale production and development, long-term protection of difficult metals, etc., to achieve good self-cleaning resistance, good protective effect, anti-corrosion effect

Active Publication Date: 2021-10-08
NORTH CHINA INST OF AEROSPACE ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent (CN105002487A) discloses a chromium-free passivator after metal plating with hydrophobic surface properties, which is mainly composed of silane coupling agent, nanomaterial, titanate coupling agent and water-based wax, although it has A certain degree of hydrophobicity but the passivation film is not self-healing, the corrosion resistance is not good, and it is difficult to provide long-term protection for the metal
Patent (CN107893223A) discloses a method for preparing a superhydrophobic phosphating composite film with high corrosion resistance and self-cleaning on the surface of zinc layer. The superhydrophobic phosphating composite film is obtained by hydrophobic modification treatment wi

Method used

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  • Self-cleaning super-hydrophobic conversion film on metal matrix, preparation method and film-forming agent of self-cleaning super-hydrophobic conversion film
  • Self-cleaning super-hydrophobic conversion film on metal matrix, preparation method and film-forming agent of self-cleaning super-hydrophobic conversion film
  • Self-cleaning super-hydrophobic conversion film on metal matrix, preparation method and film-forming agent of self-cleaning super-hydrophobic conversion film

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0045] Example 1:

[0046] This example is a self-cleaning superhydrophobic transforming film of a blue appearance, and the preparation method thereof comprises the steps of:

[0047] In the first step, the vinyltrimethoxysilane, ethanol, and deionized water were mixed in a ratio of 4: 6: 90, and the magnetic force was stirred for 1 h, and the hydrolyzed silica sol was allowed to give a hydrolyzed silicon sol.

[0048] In the second step, a certain amount of corrosion inhibitor (lanthanate), surface energy regulator (narda acid), film forming promoter (dioxygen), ionic aid (copper sulfate), to hydrolysis In a silica sol, magnetic stirring makes it sufficiently dissolved, forming a composite forming membrane fluid transparent and uniform, and finally adjusted the pH value of the solution to 3 to 5, i.e., a film forming agent of the conversion film. In this embodiment, the contents of each component are:

[0049] Silane crosslinker: 5% (V%)

[0050] Corrosion inhibitor: 0.004 (mol / ...

Example Embodiment

[0058] Example 2:

[0059] The preparation method in the present invention is different from the first embodiment, and the film formation liquid component in the examples is different:

[0060] In the first step, the methyltrimethoxysilane, ethanol, and deionized water were mixed, and the magnetic force was stirred for 1 h, and the hydrolyzed silicon sol was allowed to give a hydrolyzed silicon sol.

[0061] In the second step, a certain amount of corrosion inhibitor (cerium nitrate), surface energy regulator (stearic acid), film forming promoter (dioxywater), ionic aid (six-squeezide), to pre-proportion In the silica sol after hydrolysis, the magnetic force is stirred so much, forming a composite film liquid which is transparent and uniform, and finally adjusted the solution pH of the solution to 3 to 5, i.e., the film formulation of the transformed film was obtained by 4% nitric acid.

[0062] In the third step, the pretreated cleaning galvanized steel sample is immersed in a fo...

Example Embodiment

[0064] Example 3:

[0065] The substrate material selected in this example is a hot-dip galvanized aluminum alloy (Galfan) steel sheet, and superhydrophilic self-cleaning with blue appearance is prepared by the surface of the hot-dip galvanized aluminum alloy steel sheet by a heat galvanized aluminum alloy (Galfan) steel sheet. surface. Water droplets are greater than 150 ° in the surface of the hot-plated Galfan alloy, and the rolling angle is less than 10 °, which has good self-cleaning performance.

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Abstract

The invention relates to a self-cleaning super-hydrophobic conversion film on a metal matrix and a preparation method and a film-forming agent of the self-cleaning super-hydrophobic conversion film. The method comprises the following steps that the film-forming agent of the conversion film is obtained, and the film-forming agent of the conversion film mainly comprises the following components: a silane crosslinking agent, a corrosion inhibitor, an ion auxiliary agent, a film-forming accelerant, a surface energy regulator and a pH regulator; the ion auxiliary agent is a colored metal salt which can be subjected to a replacement reaction with the metal matrix, and the film-forming accelerant can promote a bonding reaction between silane and the metal matrix and can oxidize metal elements in the ion auxiliary agent at the same time; and the surface energy regulator can generate salt with a specific color with oxidized metal elements introduced by the ion auxiliary agent or oxides thereof, the salt grows on the surface of the metal matrix to form a film, and the salt and the silane/corrosion inhibitor are mutually crosslinked and synergistically protected in the film forming process, so that a compact film layer is formed on the surface of the metal matrix. The conversion film has a special color appearance and a lotus leaf-like effect, and has the advantages of environmental protection, simple preparation process, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment engineering, and in particular relates to a self-cleaning superhydrophobic conversion film on a metal substrate, a preparation method thereof, and a film-forming agent. Background technique [0002] The harm caused by metal corrosion is serious and common, and the corrosion of metals or alloys is still the focus of researchers. Zinc and its alloys have been widely used as anti-corrosion coating materials for steel, which can provide both physical barrier protection and sacrificial anode protection for steel substrates. In order to prevent the rapid corrosion of the galvanized layer and improve the corrosion resistance of the workpiece, chromate passivation and phosphating are usually used for surface treatment. However, phosphorus element is easy to cause eutrophication of water body, leading to water pollution, while Cr 6+ (VI) Chromate is highly toxic, harmful to human health, ...

Claims

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Application Information

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IPC IPC(8): C23C22/48C23C22/53C23C22/56
CPCC23C22/48C23C22/53C23C22/56
Inventor 李冲冲曹博皓沈文旗王倩
Owner NORTH CHINA INST OF AEROSPACE ENG
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