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Hole sealing process for magnesium-aluminum alloy

A magnesium-aluminum alloy, sealing technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of easy change of aluminum alloy color tone, unsatisfactory anti-corrosion effect, unstable sealing effect, etc. Anti-corrosion effect, good stabilizing effect and strong binding ability

Inactive Publication Date: 2018-08-24
长沙小新新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the sealing methods of the oxide film on the aluminum alloy surface mainly include high-temperature sealing, metal salt sealing, modified metal salt sealing, and inorganic sealing. High-temperature sealing such as boiling water sealing and steam sealing consumes high energy ;Metal salt sealing such as dichromate sealing, nickel salt sealing, etc. are toxic and cause great pollution to the environment; while modified metal salt sealing is mainly nickel-fluorine system, this method also causes greater environmental pollution ; The toughness of inorganic sealing such as silica is poor, the sealing effect is unstable, resulting in unsatisfactory anti-corrosion effect, and it is easy to change the color tone of aluminum alloy

Method used

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  • Hole sealing process for magnesium-aluminum alloy
  • Hole sealing process for magnesium-aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A magnesium-aluminum alloy sealing process, comprising the following steps:

[0022] S1. Wash the magnesium-aluminum alloy with water, degrease with lye, polish the electrolyte, anodize it, wash it with deionized water, and dry it with cold air to obtain a coated magnesium-aluminum alloy for use;

[0023] S2. In parts by weight, add 12 parts of ethyl orthosilicate to 40 parts of ethanol, then add 80% acetic acid to adjust the pH value to 4.6, and keep stirring for 35 minutes to obtain Sol A;

[0024] S3. In parts by weight, add 7 parts of butyl titanate to 60 parts of ethanol and mix evenly, then slowly add 70% acetic acid to adjust the pH value to 3.8, and continue stirring for 40 minutes to obtain Sol B;

[0025] S4. In parts by weight, add 30 parts of stearic acid to 90 parts of isopropanol and mix evenly, then add Sol A and Sol B, then raise the temperature to 78°C in a water bath, and stir at 1250r / min for 3min to obtain Sealing solution, put the coated magnesium-...

Embodiment 2

[0029] A magnesium-aluminum alloy sealing process, comprising the following steps:

[0030] S1. Wash the magnesium-aluminum alloy with water, degrease with lye, polish the electrolyte, anodize it, wash it with deionized water, and dry it with cold air to obtain a coated magnesium-aluminum alloy for use;

[0031] S2. In parts by weight, add 13 parts of ethyl orthosilicate to 40 parts of ethanol, then add 70% acetic acid to adjust the pH value to 5, and keep stirring for 40 minutes to obtain Sol A;

[0032] S3. In parts by weight, add 5 parts of butyl titanate to 60 parts of ethanol and mix evenly, then slowly add 75% acetic acid to adjust the pH value to 4, and continue stirring for 30 minutes to obtain Sol B;

[0033] S4. In parts by weight, add 35 parts of stearic acid to 90 parts of isopropanol and mix evenly, then add sol A and sol B, then raise the temperature to 80°C in a water bath, and stir at 1000r / min for 4min to obtain Sealing solution, put the coated magnesium-alum...

Embodiment 3

[0037] A magnesium-aluminum alloy sealing process, comprising the following steps:

[0038] S1. Wash the magnesium-aluminum alloy with water, degrease with lye, polish the electrolyte, anodize it, wash it with deionized water, and dry it with cold air to obtain a coated magnesium-aluminum alloy for use;

[0039] S2. In parts by weight, add 10 parts of tetraethyl orthosilicate to 40 parts of ethanol, then add 75% acetic acid to adjust the pH value to 5.3, and keep stirring for 30 minutes to obtain Sol A;

[0040] S3. In parts by weight, add 6 parts of butyl titanate to 60 parts of ethanol and mix evenly, then slowly add 80% acetic acid to adjust the pH value to 3.5, and continue stirring for 36 minutes to obtain Sol B;

[0041] S4. In parts by weight, add 38 parts of stearic acid to 90 parts of isopropanol and mix evenly, then add Sol A and Sol B, then raise the temperature to 80°C in a water bath, and stir at 1000r / min for 4min to obtain Sealing solution, put the coated magne...

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Abstract

The invention discloses a hole sealing process for magnesium-aluminum alloy. The hole sealing process comprises the following steps of: washing the magnesium-aluminum alloy by using water; degreasingthe magnesium-aluminum alloy by using alkaline liquid; polishing the magnesium-aluminum alloy by using an electrolyte and subsequently carrying out anodic oxidation; washing the magnesium-aluminum alloy by using deionized water and drying the magnesium-aluminum alloy by cold air to obtain film-coated magnesium-aluminum alloy for later use; by weight, adding 10-13 parts of tetraethoxysilane into 40parts of ethanol; subsequently adding acetic acid to regulate the pH value to be 4.6 to 5.3; continuously mixing for 30 min to 40 min to obtain sol A; adding 5-7 parts of butyl titanate into 60 partsof ethanol; mixing the butyl titanate with the ethanol uniformly; afterwards slowly adding the acetic acid to regulate the pH value to 3.5 to 4; continuously mixing for 30 min to 40 min to obtain solB; dissolving stearic acid by using isopropanol; adding the sol A and the soil B into the isopropanol to obtain hole sealing liquid; and carrying out hole sealing on the magnesium-aluminum alloy by using the hole sealing liquid. The hole sealing process disclosed by the invention has the characteristics of being free of fluorine, free of heavy metal pollution, stable in hole sealing effect and low in energy consumption.

Description

technical field [0001] The invention relates to a hole sealing process of magnesium and aluminum alloys. Background technique [0002] In order to improve its corrosion resistance when aluminum alloy is used in construction, decoration and other industries, its surface is generally anodized, and then colored according to requirements. Since the alloy oxide film has a porous structure, the prior art usually performs sealing treatment on the alloy oxide film. At present, the sealing methods of the oxide film on the aluminum alloy surface mainly include high-temperature sealing, metal salt sealing, modified metal salt sealing, and inorganic sealing. High-temperature sealing such as boiling water sealing and steam sealing consumes high energy ;Metal salt sealing such as dichromate sealing, nickel salt sealing, etc. are toxic and cause great pollution to the environment; while modified metal salt sealing is mainly nickel-fluorine system, this method also causes greater environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/24
CPCC25D11/246
Inventor 不公告发明人
Owner 长沙小新新能源科技有限公司
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