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A kind of aluminum alloy chromium-free passivating agent and preparation method thereof

A chromium-free passivator and aluminum alloy technology, applied in the coating process of metal materials, etc., can solve problems such as workpiece corrosion and oxide film damage, and achieve the effect of avoiding damage

Active Publication Date: 2017-01-04
WUXI EPIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For aluminum alloy workpieces, because aluminum is easily oxidized in the air to form a dense oxide film, it has a certain protective effect on the interior of the aluminum alloy, but as time goes by and the environment changes, the oxide film is easily damaged
resulting in workpiece corrosion

Method used

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  • A kind of aluminum alloy chromium-free passivating agent and preparation method thereof

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Embodiment 1

[0023] A chromium-free passivating agent for aluminum alloy, which is prepared according to the proportions by weight of the following raw materials: 12 parts of citric acid, 10 parts of sodium citrate, 6 parts of sodium persulfate, 7 parts of sodium silicate, 6 parts of phosphoric acid, and cobalt nitrate 2 parts, 6 parts of sodium sulfite, 12 parts of malonic acid, 2 parts of ammonium fluoride, 1 part of sodium dodecylbenzenesulfonate, 25 parts of water.

[0024] A preparation method of an aluminum alloy chromium-free passivator, comprising the following steps:

[0025] (1) Pour citric acid, sodium citrate, sodium persulfate, sodium silicate, phosphoric acid and water into the reaction kettle, stir for 25 minutes at a temperature of 13°C and a pressure of 0.05MPa, and the speed of the stirrer is 400 rpm / min, adjust the pH to 4 after the stirring is completed;

[0026] (2) Add cobalt nitrate, sodium sulfite, and malonic acid into water, and dissolve them under magnetic stir...

Embodiment 2

[0030] A chromium-free passivating agent for aluminum alloy, which is prepared according to the proportions by weight of the following raw materials: 15 parts of citric acid, 12 parts of sodium citrate, 8 parts of sodium persulfate, 9 parts of sodium silicate, 8 parts of phosphoric acid, and cobalt nitrate 4 parts, 8 parts of sodium sulfite, 14 parts of malonic acid, 4 parts of ammonium fluoride, 2 parts of sodium dodecylbenzenesulfonate, 35 parts of water.

[0031] A preparation method of an aluminum alloy chromium-free passivator, comprising the following steps:

[0032] (1) Pour citric acid, sodium citrate, sodium persulfate, sodium silicate, phosphoric acid and water into the reaction kettle, stir for 30 minutes at a temperature of 15°C and a pressure of 0.06MPa, and the speed of the stirrer is 450 rpm / min, adjust the pH to 4 after the stirring is completed;

[0033] (2) Add cobalt nitrate, sodium sulfite, and malonic acid into water, and dissolve them under magnetic sti...

Embodiment 3

[0037] A chromium-free passivator for aluminum alloy, prepared according to the proportions of the following raw materials by weight: 20 parts of citric acid, 15 parts of sodium citrate, 10 parts of sodium persulfate, 12 parts of sodium silicate, 12 parts of phosphoric acid, cobalt nitrate 6 parts, 10 parts of sodium sulfite, 16 parts of malonic acid, 6 parts of ammonium fluoride, 4 parts of sodium dodecylbenzenesulfonate, 45 parts of water.

[0038] A preparation method of an aluminum alloy chromium-free passivator, comprising the following steps:

[0039] (1) Pour citric acid, sodium citrate, sodium persulfate, sodium silicate, phosphoric acid and water into the reaction kettle, stir for 33 minutes at a temperature of 17°C and a pressure of 0.06MPa, and the speed of the stirrer is 500 rpm / min, adjust the pH to 4 after the stirring is completed;

[0040] (2) Add cobalt nitrate, sodium sulfite, and malonic acid into water, and dissolve them under magnetic stirring at a tempe...

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Abstract

The invention discloses an aluminum alloy chromium-free passivating agent and a preparation method thereof. The aluminum alloy chromium-free passivating agent is prepared from the following raw materials by weight: 12-35 parts of citric acid, 10-22 parts of sodium citrate, 6-16 parts of sodium persulfate, 7-22 parts of sodium silicate, 6-18 parts of phosphoric acid, 2-11 parts of cobalt nitrate, 6-20 parts of sodium sulfite, 12-32 parts of malonic acid, 2-11 parts of ammonium fluoride, 1-9 parts of sodium dodecyl benzene sulfonate, and 25-65 parts of water. The passivating agent provided by the invention can achieve passivation at room temperature, has short passivation time, and is environment-friendly and pollution-free. The formed passivation film enhances the corrosion resistance of aluminum alloy.

Description

technical field [0001] The invention relates to a passivating agent, in particular to an aluminum alloy chromium-free passivating agent and a preparation method thereof. Background technique [0002] In recent decades, hexavalent chromate passivation has been used in our country. Hexavalent chromate passivation treatment significantly improves the corrosion resistance of the alloy, and the generated passivation film has self-healing effect, and is cheap and widely used. , but the chromate passivation solution contains hexavalent chromium, a highly toxic carcinogen, which seriously affects human health and pollutes the environment. At present, countries all over the world have begun to restrict or ban the use of chromate treatment methods. Therefore, there is an urgent need to develop a non-toxic, environmentally friendly, high-efficiency, and low-consumption hexavalent chromium-free passivation technology to achieve a high-quality, environmentally friendly steel surface pas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/36
Inventor 尤为
Owner WUXI EPIC TECH