Aluminum alloy workpiece with layered double hydroxide-graphene oxide silane composite coating and preparation method of aluminum alloy workpiece

A hydroxide and composite coating technology, applied in coatings, electrolytic coatings, etc., can solve the problems of high price of fluorine-containing hydrophobic compounds, weak bonding force of dip coating modification, difficult to deal with long-term erosion, etc., and achieve stable long-term protection effect. , The effect of compact structure and high anti-corrosion performance

Active Publication Date: 2021-03-26
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

The above patents show that LDH has application prospects in the direction of corrosion protection. However, the price of fluorine-containing hydrophobic compounds is high, which will harm the environment, and the binding force of dip coating modification is weak, so it is difficult to meet the challenge of long-term corrosion

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  • Aluminum alloy workpiece with layered double hydroxide-graphene oxide silane composite coating and preparation method of aluminum alloy workpiece
  • Aluminum alloy workpiece with layered double hydroxide-graphene oxide silane composite coating and preparation method of aluminum alloy workpiece
  • Aluminum alloy workpiece with layered double hydroxide-graphene oxide silane composite coating and preparation method of aluminum alloy workpiece

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preparation example Construction

[0023] The preparation method of the aluminum alloy parts with layered double hydroxide-graphene oxide silane composite coating provided by the invention comprises the following steps:

[0024] Step S0, the pretreatment step, is performed before step S1, including a polishing step and an ultrasonic cleaning step, and the specific operations are as follows:

[0025] (1) In the grinding step, the aluminum alloy parts are polished with 600-mesh, 1000-mesh, 1500-mesh, and 2000-mesh water-grinding sandpaper in sequence,

[0026] (2) Ultrasonic cleaning step, the polished aluminum alloy parts are placed in acetone, ultrasonically cleaned, and then rinsed with absolute ethanol and deionized water in order to remove oil and grease on the surface of the aluminum alloy parts.

[0027] Step S1, prepare the mixed metal salt suspension with aluminum salt and zinc salt, and adjust the pH value of the mixed metal salt suspension to 9-11.

[0028] Step S2, putting the aluminum alloy part int...

Embodiment 1

[0046] A preparation method of layered double hydroxide-graphene oxide silane composite coating, comprising the steps of:

[0047] Step S0, pretreatment of aluminum alloy parts:

[0048] Three pieces of 40mm×13mm×2mm aluminum alloy 5052 were polished with 600#, 1000#, 1500#, 2000# water-grinding sandpaper in sequence. Then put the aluminum alloy in acetone, ultrasonically clean it with an ultrasonic cleaner for about 5 minutes, and then rinse it with absolute ethanol and deionized water in order to remove surface oil and grease. Take one piece of the aluminum alloy product obtained in this step as a blank aluminum alloy (BareAl), and continue the experiment with the remaining two pieces.

[0049] Step S1, preparation of mixed metal salt suspension:

[0050] Weigh 0.1M zinc nitrate and 0.05M aluminum nitrate and dissolve in 200mL water, measure concentrated ammonia water and dissolve in 20mL mixed metal salt suspension, and adjust pH=10.

[0051] Step S2, hydrothermal treatm...

Embodiment 2

[0069] A preparation method of layered double hydroxide-graphene oxide silane composite coating, comprising the steps of:

[0070] Step S0, pretreatment of aluminum alloy parts:

[0071] Three pieces of 40mm×13mm×2mm aluminum alloy 5052 were polished with 600#, 1000#, 1500#, 2000# water-grinding sandpaper in sequence. Put the aluminum alloy in acetone, ultrasonically clean it with an ultrasonic cleaner for about 5 minutes, and then rinse it with absolute ethanol and deionized water in order to remove surface oil and grease.

[0072] Step S1, preparation of mixed metal salt suspension:

[0073] Weigh 0.1M and dissolve in 200mL water, measure concentrated ammonia water and dissolve in 20mL mixed metal salt suspension, adjust pH=9.

[0074] Step S2, hydrothermal treatment co-precipitation:

[0075] Add the aluminum alloy obtained in step S0 to the solution obtained in step S1, place it at 60° C. for 12 hours, take it out and dry it naturally in the air. Take one piece of the ...

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Abstract

The invention belongs to the technical field of aluminum alloy surface treatment, and provides an aluminum alloy workpiece with a layered double hydroxide-graphene oxide silane composite coating and apreparation method of the aluminum alloy workpiece. The method comprises the following steps that S1, a mixed metal salt solution is prepared from aluminum salt and zinc salt, and the pH value of themixed metal salt solution is adjusted to 9-11; S2, the aluminum alloy workpiece is put into the mixed metal salt solution to be subjected to hydro-thermal treatment for a period of time, and the aluminum alloy workpiece subjected to thermal treatment is obtained; and S3, the aluminum alloy workpiece subjected to thermal treatment is put into a GO/DTMS ethanol solution, electro-deposition is conducted with the GO/DTMS ethanol solution as an electrolyte, a platinum electrode as an anode and the aluminum alloy workpiece as a cathode, and the layered double hydroxide-graphene oxide silane composite coating is deposited on the surface of the alloy workpiece. According to the aluminum alloy workpiece with the layered double hydroxide-graphene oxide silane composite coating and the preparation method of the aluminum alloy workpiece, the super-hydrophobic coating is prepared on the surface of the aluminum alloy, so that the corrosion resistance of the aluminum alloy in a saline solution is greatly improved; and in addition, the preparation method is simple, and large-scale preparation can be achieved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy surface treatment, and in particular relates to an aluminum alloy product with a layered double hydroxide-graphene oxide silane composite coating and a preparation method thereof. Background technique [0002] As a light metal with high specific strength, aluminum alloy plays an irreplaceable role in the fields of aerospace, automobile manufacturing and marine engineering. However, the corrosion problem has brought great challenges to the application of aluminum alloys. The annual direct loss caused by the corrosion of metal substrates is equivalent to 3-4% of the gross domestic product. In order to reduce the damage caused by corrosion, researchers have developed a variety of methods to provide protection for aluminum alloys, such as anodic oxidation, corrosion inhibitors, and organic coatings. [0003] In recent years, many researchers have focused their attention on the preparation of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/44C25D15/00
CPCC25D5/44C25D15/00
Inventor 徐群杰贺子豪周苗淼曾彦玮沈喜训闵宇霖
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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