Method for modifying bonding surface of metal by virtue of electric grafting of aryl diazonium salts onto surface of metal

An aryl diazonium salt and electrografting technology, which is applied in the direction of metal layered products, chemical instruments and methods, surface reaction electrolytic coating, etc., can solve the problems of fiber strength loss, easy pollution, high cost, etc., and achieve interface bonding The effect of enhanced effect, low price, and simple and easy surface treatment method

Inactive Publication Date: 2016-07-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the technical problems of low production efficiency, easy pollution, high cost and large loss of fiber strength in the current carbon fiber surface modification method

Method used

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  • Method for modifying bonding surface of metal by virtue of electric grafting of aryl diazonium salts onto surface of metal
  • Method for modifying bonding surface of metal by virtue of electric grafting of aryl diazonium salts onto surface of metal
  • Method for modifying bonding surface of metal by virtue of electric grafting of aryl diazonium salts onto surface of metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1), TA2 titanium plate surface pickling pretreatment:

[0035] Rinse the surface of the TA2 titanium plate with distilled water to remove surface pollutants; then wipe the surface of the TA2 thin plate with acetone to remove surface grease; then put the TA2 titanium plate into a mixed acid composed of 350g / L nitric acid and 60g / L hydrofluoric acid In the solution, acid wash at 40°C for 40s to remove the surface oxide layer, take it out and dry it at 80°C for 10min to obtain a dried and cleaned TA2 board.

[0036] 2. Preparation of p-nitrophenylaryl diazonium salt:

[0037] Measure 4ml of distilled water and 6.8ml of concentrated hydrochloric acid into a clean 50mL beaker and keep stirring. After cooling to room temperature, move the beaker to an ice-salt bath. Then add 2.76g of p-nitroaniline powder into the beaker and stir for 3 to 5 minutes to completely dissolve it. Stand for several minutes so that the temperature of the solution is maintained at 0-5°C. At the s...

Embodiment 2

[0048] (1), TA2 surface anodic oxidation pretreatment:

[0049] (A), rinse the surface of the TA2 titanium plate with distilled water to remove surface pollutants; then wipe the surface of the TA2 thin plate with acetone to remove surface grease; then put the TA2 titanium plate into the nitric acid of 350g / L and the hydrofluorine of 60g / L In a mixed acid solution composed of acid, pickle at 40°C for 40s to remove the surface oxide layer, take it out and dry it at 80°C for 10min to obtain a dried and cleaned TA2 board.

[0050] (B), the TA2 titanium plate that obtains in the step (A) is put into electrolyzer and carry out anodic oxidation, with TA2 titanium plate as anode, stainless steel plate as negative electrode, by 300g / L sodium hydroxide, 65g / L sodium tartrate , 30g / L ethylenediaminetetraacetic acid, 6g / L sodium silicate in the electrolyte composed of 10V voltage oxidation for 10min, so that the surface of TA2 titanium plate to obtain a layer of uniform and dense oxide fi...

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Abstract

The invention belongs to the field of treatment of a bonding surface of metal and particularly relates to a method for modifying the bonding surface of metal by virtue of electric grafting of aryl diazonium salts onto the surface of metal. The method comprises the steps that a clean metal plate is subjected to surface treatment with an acid pickling method or/and an anodizing method and dried; p-nitroaniline is dissolved in an acidic aqueous solution, then a sodium nitrite solution is added dropwise to the p-nitroaniline-containing acidic aqueous solution under the condition of 0-5 DEG C, and an obtained mixture is stirred and subjected to cold storage; the pretreated metal plate is placed into an aryl diazonium salt solution prepared in the previous step, and an electric grafting reaction is carried out by cyclic voltammetry in a three-electrode system; and the metal plate is cleaned and dried finally. Active functional groups are produced on the metal surface with the electric grafting method, so that the properties of an interface between the metal and resin are improved under an anchoring action and a chemical bond action. The surface treatment method is simple and easy and suitable for mass production, and the cost is low.

Description

technical field [0001] The invention belongs to the field of metal adhesive surface treatment, in particular to a method for modifying the metal adhesive surface by electrografting of aryl diazonium salt. Background technique [0002] Fiber Reinforced Metal laminates (Fiber Reinforced Metal laminates) is an interlayer hybrid composite material formed by hot pressing and curing of metal sheets and fiber composite materials. It has excellent fatigue properties, high specific strength, corrosion resistance, flame retardancy, and impact resistance. Therefore, it is widely used in the fields of military and civilian industries, and it has attracted the attention of the world because of its brilliant performance in the aerospace field. However, the biggest feature of the fiber metal laminate structure is the multi-layer interface. The existence of these interfaces makes the fiber metal laminate prone to delamination and cracking during use, resulting in a decrease in material stif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/00B32B15/14B32B37/12B32B38/00
CPCC25D11/00B32B15/14B32B37/12B32B38/00
Inventor 潘蕾段理想徐飞吕云飞陶杰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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