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Preparation method of cast aluminum alloy film coat

A cast aluminum alloy and coating technology, which is applied in the field of preparation of cast aluminum alloy thin film coating, can solve problems such as easy corrosion, failure to meet service requirements, and influence on equipment reliability

Inactive Publication Date: 2010-07-21
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The surface protection treatment of large or extra-large aluminum alloy components is mainly divided into two categories: one is the treatment of the machined surface or the machined surface. At present, the chromate conductive oxidation treatment is mainly used. Although the formed conductive oxide film has Certain anti-corrosion ability (can withstand 5% neutral salt spray test ability for about 24 hours), but the protection ability is weak, it is difficult to resist the corrosion hazards of the marine environment, and cannot meet the use requirements
The second is the treatment of the non-machined surface of the shell, which basically adopts the treatment method of epoxy primer layer and acrylic polyurethane topcoat. The corrosion situation after use is specifically shown as: (1) Machined surface or machined lamination The contact part of the edge of the sealing groove on the surface is easy to corrode. After the corrosion product expands, stress corrosion occurs and gradually expands, which affects the positioning size or displacement, thereby affecting the reliability of equipment operation; (2) Machined surface or machined bonding surface Corrosion or corrosion pits are generated due to the penetration of corrosive atmosphere; (3) The surface of the shell is coated with epoxy primer and acrylic polyurethane topcoat. Although it can be repainted and repaired, the paint is often peeled off due to the erosion of corrosive atmosphere. must be effectively addressed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Cut the cast aluminum alloy ZL114 material into a test plate, the size is 50mm×50mm×4mm, and the cutting surface is polished to a surface roughness of Ra1.6; the above sample is cleaned with a mixed solvent of acetone:ethanol with a volume ratio of 1:1, the method: Use fine cotton yarn soaked in organic solvent to wipe, and clean it twice; then use a commercially available weak alkaline degreasing agent with a weight percentage of 1%, and heat it to 60°C to clean the oil stains, and finally wash with tap water to remove the residual weak alkaline Degreaser.

[0032] Use self-adhesive tape to separate the non-treated parts to avoid the erosion of the treatment agent as much as possible, and then use a clean wool brush to evenly brush the solution for chromate oxidation treatment with the following weight percentages: 0.5% sodium chromate, 0.2 % sodium fluoride, 1% sodium fluoroborate, 5% particle size is 20μm, bulk density is 0.4g / cm 3 hollow glass microspheres, and the...

Embodiment 2

[0037]Cut the cast aluminum alloy ZL104 material into a test plate with a size of 45mm×50mm×5mm, and polish the cutting surface to a surface roughness of Ra1.6; Mixed solvent cleaning method: use fine cotton yarn soaked in organic solvent to wipe, clean three times; then use a commercially available weak alkaline degreasing agent with a weight percentage of 1.5%, heat to 65°C to clean the oil, and finally wash and remove it with tap water Residual weak alkaline degreaser.

[0038] Use self-adhesive tape to separate the non-treated parts to avoid the erosion of the treatment agent as much as possible, and then use a clean wool brush to evenly brush the solution for chromate oxidation treatment in the following percentages by weight: 2% chromic anhydride, 0.5% Potassium fluoride, 2% fluoboric acid, 10% particle size 40μm, bulk density 0.35g / cm 3 hollow glass microspheres, and the balance is water; and the pH is adjusted to 2.3 by using 7% nitric acid solution and 4% sodium hydr...

Embodiment 3

[0043] Cut the test plate of the cast aluminum alloy ZL104 material, the size is 50mm×50mm×6mm, and the cutting surface is polished to a surface roughness of Ra0.8; the above sample is cleaned with acetone. Then use a commercially available weak alkaline degreasing agent with a weight percentage of 2%, heat it to 70° C. to clean the oil stains, and finally wash with tap water to remove the residual weak alkaline degreasing agent.

[0044] Use self-adhesive tape to separate the non-treated parts to avoid the erosion of the treatment agent as much as possible, and then use a clean wool brush to evenly brush the solution for chromate oxidation treatment in the following percentages by weight: 4% sodium dichromate, 1.5% potassium fluoride, 5% sodium fluorosilicate, 15% particle size 20μm, bulk density 0.4g / cm 3 fly ash, and the rest is water; and use 10% nitric acid solution and 5% sodium hydroxide solution to adjust the pH to 3.0. The subsequent chromate oxidation treatment is a...

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PUM

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Abstract

The invention relates to a preparation method of a cast aluminum alloy film coat, which is characterized by cleaning a cast aluminum alloy component firstly, performing chromate oxidation treatment secondly, and then preparing a film sealing coat of fluorine containing acrylicester on a chromate oxide film. Construction methods such as brushing or spraying is used for the invention, the methods are flexible and simple and has high maneuverability; the invention can be applied in the protective treatment for cast aluminum alloy of ZL102, ZL104, ZL107, ZL112, ZL114 and the like, and is particularly suitable for treatment of the cast aluminum alloy component used in the ocean environment; and the invention is also suitable for the protective treatment of other aluminum alloy materials or components, such as treatment of duralumin, super duralumin, wrought aluminum and rust-proof aluminum alloy.

Description

technical field [0001] The invention relates to chemical treatment of the surface of metal materials, in particular to a preparation method of cast aluminum alloy film coating. Background technique [0002] In the field of modern civil and military industries, in order to meet the requirements of high strength, corrosion resistance and lightweight, more and more aluminum alloy materials are used in the design and manufacture of equipment and general machinery. Aluminum alloy materials are used in military equipment and civilian products. It occupies an important position in the design and manufacture of aluminum alloy and is the most important lightweight material. Due to the good casting performance of aluminum alloy, a large number of large or extra-large structural parts are made of cast aluminum alloy materials. After the casting mold is completed, necessary machining and polishing are carried out according to the purpose of the component and the cooperation with other c...

Claims

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Application Information

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IPC IPC(8): C23C22/37C23C22/82
Inventor 邹洪庆苏艳吕基成方敏钱建才吴厚昌
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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