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Double-layer copolymerized polyimide composite coating on surface of aluminum alloy and preparation method of double-layer copolymerized polyimide composite coating

A technology of aluminum alloy surface and composite coating, applied in surface reaction electrolytic coating, device for coating liquid on the surface, coating, etc. The effect of binding capacity

Inactive Publication Date: 2019-10-29
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the compartments of refrigerated trucks on the market now use aluminum alloy as their main material. Although the weight is light and the cost is not high, it is easy to shape during production. Corrosion, so the aluminum alloy carriage needs to be improved, otherwise it cannot be used for the transportation of seafood and aquatic products

Method used

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  • Double-layer copolymerized polyimide composite coating on surface of aluminum alloy and preparation method of double-layer copolymerized polyimide composite coating
  • Double-layer copolymerized polyimide composite coating on surface of aluminum alloy and preparation method of double-layer copolymerized polyimide composite coating
  • Double-layer copolymerized polyimide composite coating on surface of aluminum alloy and preparation method of double-layer copolymerized polyimide composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of anodized film substrate:

[0045] Aluminum alloy substrate pretreatment: degreasing - use 20% H 2 SO 4 Acid washing of the solution; alkaline washing—use 100g / L NaOH solution at a solution temperature of 50°C; ash removal—add 5% HNO to 160g / L sulfuric acid solution 3 .

[0046] Anodizing treatment:

[0047] Sulfuric acid is used as bath solution for anodic oxidation treatment. In order to improve the hardness and wear resistance of the sulfuric acid anodized film, a solution with a sulfuric acid concentration of 150g / L is selected, and oxalic acid with a concentration of 30g / L is added to the solution, which can reduce the corrosion effect of the bath on the anodized film; the current density is 1.2A / dm 2 , the oxidation time is 45min.

[0048] The aluminum alloy is used as the anode, and the graphite plate is used as the cathode. During the anodizing process, the method of mechanical stirring in the electrolytic cell is used to dissipate the h...

Embodiment 2

[0068] Anodized film substrate preparation:

[0069] (1) Aluminum alloy substrate pretreatment: degreasing - use 20% H 2 SO 4 Acid washing of the solution; alkaline washing—use 100g / L NaOH solution at a solution temperature of 50°C; ash removal—add 5% HNO to 160g / L sulfuric acid solution 3 .

[0070] (2) Anodizing treatment:

[0071] Sulfuric acid is used as bath solution for anodic oxidation treatment. In order to improve the hardness and wear resistance of the sulfuric acid anodized film, a solution with a sulfuric acid concentration of 150g / L is selected, and oxalic acid with a concentration of 30g / L is added to the solution, which can reduce the corrosion effect of the bath on the anodized film; the current density is 1.2A / dm 2 , the oxidation time is 45min.

[0072] The aluminum alloy is used as the anode, and the graphite plate is used as the cathode. During the anodizing process, the method of mechanical stirring in the electrolytic cell is used to dissipate the ...

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Abstract

The invention relates to a double-layer copolymerized polyimide composite coating on the surface of an aluminum alloy and a preparation method of the double-layer copolymerized polyimide composite coating. The preparation method comprises the following steps of coating polyimide solution on an aluminum alloy substrate containing an anode oxide film, carrying out drying and two-step curing treatment to obtain the double-layer copolymerized polyimide composite coating. The coating prepared by the preparation method has better corrosion resistance capability, strong adhesion capability and capability of effectively preventing shedding; and after the coating is used with an anodic oxidation coating, the adhesive force can be effectively increased, so that the coating has stronger corrosion resistance capability, the surface of an aluminum alloy material is effectively protected, and the coating has popularization and application values.

Description

technical field [0001] The invention belongs to the field of aluminum alloy materials and its preparation, in particular to a double-layer copolymerized polyimide composite coating on the surface of an aluminum alloy and its preparation. Background technique [0002] Copolymerized polyimide has excellent coating properties on the surface of various materials such as silicon wafers, metals, optical fibers, rubber optical fibers, etc., and can be widely used in machinery, aviation, sensors, electronics industries, etc. that require ultra-high temperature resistance and high insulation of various fields. Polyimide is a class of polymers containing imide rings on the main chain. Polyimide has excellent comprehensive properties and is a heterocyclic polymer compound widely used in polymer materials. Homo-phenylene polyimide is made of pyromellitic dianhydride and diaminodiphenyl ether. In the heterogeneous suspension polycondensation method, polyamic acid (PA acid) is synthesiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D3/00B05D3/02B05D7/14B05D7/24C25D11/04C25D11/08C25D11/24
CPCB05D3/002B05D3/0254B05D3/0272B05D7/14B05D7/24C25D11/04C25D11/08C25D11/246
Inventor 孔永华王慕帆何威
Owner DONGHUA UNIV