Cobaltous acetate-doped sol-gel film layer and preparation method thereof

A sol-gel, cobalt acetate technology, applied in coatings, metal material coating processes, solid-state chemical plating, etc., can solve the problems of reducing the stability of sol-gel, reducing corrosion resistance, and being unsuitable for long-term protection. Effects of strong social and economic value, improved corrosion resistance, good stability and durability

Inactive Publication Date: 2011-06-01
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of additives will also have some side effects, such as reducing the stability of the sol-gel, and molybdate ions will reduce the stability of the network structure of the sol-gel, thereby reducing its corrosion resistance
In addition, some additives are not easy to be controlled due to their rapid release from the film layer, and the solubility of the additives also has an important impact on the long-term corrosion protection performance of the sol-gel film. For example, trivalent cerium is not suitable for use due to its high solubility. for long-term protection

Method used

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  • Cobaltous acetate-doped sol-gel film layer and preparation method thereof
  • Cobaltous acetate-doped sol-gel film layer and preparation method thereof
  • Cobaltous acetate-doped sol-gel film layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1) Pretreatment of aluminum and aluminum alloys

[0041] ① Grinding: Grinding to 800# with sandpaper;

[0042] ②Washing with flowing tap water;

[0043] ③ Alkaline washing: Sodium hydroxide 55g / L, immerse at 50~60℃ for 30s;

[0044] ④Wash with hot water and then wash with running water;

[0045] ⑤ Idemitsu: chromic acid: 110g / L; nitric acid: 45g / L; hydrofluoric acid: 22g / L;

[0046] ⑥Wash with running water.

[0047] 2) Preparation of undoped sol

[0048] ① Use a graduated cylinder to measure 1L of absolute ethanol as a sol for later use;

[0049] ② Preparation of GTMS sol system: Slowly pour 60mL of GTMS into an appropriate amount of stirring solvent, then add excess deionized water to fully hydrolyze GTMS;

[0050]③Preparation of TPOZ sol system: using ethyl acetoacetate as catalyst, first fully stir 13mL of ethyl acetoacetate and an appropriate amount of solvent, then slowly add 26.7mL of TPOZ; after mixing evenly, slowly add deionized water dropwise, The mola...

Embodiment 2

[0059] 1) Pretreatment of aluminum and aluminum alloys

[0060] The specific process is the same as in Example 1.

[0061] 2) Preparation of doped 0.05wt.% cobalt acetate sol

[0062] ① Use a graduated cylinder to measure 1L of absolute ethanol as a sol for later use;

[0063] ② Preparation of GTMS sol system: Slowly pour 60mL of GTMS into an appropriate amount of solvent under stirring, and then add excess deionized water to fully hydrolyze GTMS;

[0064] ③Preparation of TPOZ sol system: using ethyl acetoacetate as catalyst, first fully stir 13mL of ethyl acetoacetate and an appropriate amount of solvent, then slowly add 26.7mL of TPOZ; after mixing evenly, slowly add deionized water dropwise, The molar ratio of TPOZ to deionized water is 3:1;

[0065] ④The above two sol systems were respectively placed at room temperature and stirred for 0.5h;

[0066] Mix the above two sol systems and stir evenly;

[0067] ⑤ Weighing a certain amount of cobalt acetate, fully dissolving...

Embodiment 3

[0072] 1) Pretreatment of aluminum and aluminum alloys

[0073] The specific process is the same as in Example 1.

[0074] 2) Preparation of doped 0.15wt.% cobalt acetate sol

[0075] ① Use a graduated cylinder to measure 1L of absolute ethanol as a sol for later use;

[0076] ② Preparation of GTMS sol system: Slowly pour 60mL of GTMS into an appropriate amount of stirring solvent, then add excess deionized water to fully hydrolyze GTMS;

[0077] ③Preparation of TPOZ sol system: using ethyl acetoacetate as catalyst, first fully stir 13mL of ethyl acetoacetate and an appropriate amount of solvent, then slowly add 26.7mL of TPOZ; after mixing evenly, slowly add deionized water dropwise, The molar ratio of TPOZ to deionized water is 3:1;

[0078] ④The above two sol systems were respectively placed at room temperature and stirred for 0.5h;

[0079] ⑤ Mix the above two sol systems and stir evenly;

[0080] ⑥ Weighing a certain amount of cobalt acetate, fully dissolving it in a...

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Abstract

The invention provides a cobaltous acetate-doped sol-gel film layer and a preparation method thereof. In the sol system of the sol-gel film layer, zirconium isopropanol and gamma-glycidoxypropyltrimethoxysilane are used a precursors, absolute ethanol is used as a solvent, ethyl acetoacetate is used as a catalyst, and cobaltous acetate serving as an additive is doped in the sol system. The film is complete and compact and can provide a physical barrier for aluminum and aluminum alloy to prevent corrosive media from entering the aluminum and aluminum alloy, so that the corrosion reaction on the aluminum alloy is inhibited and the corrosion resistance of the aluminum alloy is improved; and the film also has high stability and durability, can exert a corrosion inhibition effect on damaged sol-gel films, and the corrosion inhibition effect can delay or even inhibit the damage of the corrosive media to the surfaces of metals.

Description

technical field [0001] The invention relates to an anti-corrosion film layer of metal materials and a preparation method thereof, in particular to a sol-gel film layer doped with cobalt acetate and a preparation method thereof, which is especially suitable for corrosion protection of aluminum and aluminum alloys. Background technique [0002] Aluminum and aluminum alloys are widely used in light industry, building materials, aerospace, electronics and other fields due to their small specific gravity, good processing performance, excellent electrical and thermal conductivity, good plasticity, easy forming, and low price. However, the aluminum alloy substrate itself is easily corroded, and in certain cases it is necessary to carry out necessary surface treatment. [0003] In view of the fact that the use of traditional chromates that can provide corrosion resistance to aluminum alloys is harmful to the environment and is limited, a lot of research has been done on substitutes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C20/00
Inventor 李松梅丁娇娇刘建华于美詹中伟
Owner BEIHANG UNIV
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