Method for significantly improving metal joint strength by using metal complex

A technology of metal complexes and metal glues, applied in metal material coating process, anodic oxidation, electrolytic coating, etc., can solve the problems of high temperature resistance, improve interface performance, simple preparation process, and controllable reaction conditions

Active Publication Date: 2018-03-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method of improving the surface activity of metals through organic substances is only used in medi...

Method used

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  • Method for significantly improving metal joint strength by using metal complex
  • Method for significantly improving metal joint strength by using metal complex
  • Method for significantly improving metal joint strength by using metal complex

Examples

Experimental program
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Embodiment 1

[0031] The first step is metal pretreatment. Cut a TC4 titanium plate of appropriate size, wash it with distilled water, and put the sample into acetone to clean it to remove oil; Rinse the sample with clean water and then transfer it to acid solution for cleaning for about 40 seconds to remove the oxide film on the surface of the TC4 titanium plate.

[0032] The second step is metal anodizing. Preparation of electrolyte: sodium hydroxide 300g / L, sodium tartrate 65g / L, ethylenediaminetetraacetic acid 30g / L, sodium silicate 6g / L. A TC4 titanium plate is used as the anode, and a stainless steel of the same size is used as the cathode, and the distance between the cathode and the anode is fixed at 3 cm. The voltage of the DC power supply during anodizing is 10V-15V, and the time is 10min-20min.

[0033] The third step is the hydroxylation of the metal surface. Configure Piranha solution, where H 2 SO 4 with H 2 o 2 The volume ratio of the solution is 7:3. Immerse the tre...

Embodiment 2

[0039] The first step is metal pretreatment. Cut a TC4 titanium plate of appropriate size, wash it with distilled water, and then put the sample into an acetone solution to clean it to remove oil stains; Rinse the sample with clean water and then transfer it to acid solution for cleaning for about 40s to remove the oxide film on the surface of the TC4 titanium plate.

[0040] In the second step, the metal surface is hydroxylated. Configure Piranha solution, where H 2 SO 4 with H 2 o 2 The volume ratio of the solution is 7:3. Immerse the treated TC4 in the above solution, treat it at a high temperature of 90°C for about 5 minutes, take out the metal plate, rinse it with distilled water several times, dry it, and set it aside.

[0041] The third step is to prepare Schiff base complexes and Schiff base titanium complexes. Weigh 9.4g (0.04mol) of 3,5-di-tert-butylsalicylaldehyde in 60mL of absolute ethanol, dissolve under magnetic stirring under reflux, and quickly drop 1.2...

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Abstract

The invention relates to a method for significantly improving the metal joint strength by using a metal complex, in particular to influence of a schiff base metal complex on the metal joint strength.According to the design method, a micro-nano structure is constructed on a clean metal plate firstly, the surface of the metal plate is subjected to hydroxylation, and a bis-salicylaldehyde schiff base ligand and the metal complex thereof are prepared; and the schiff base metal complex is self-assembled on the surface of the metal plate, hot pressing is conducted for making a single-lap shearing sample, and the influence of the schiff base metal complex on the joint strength of metal/resin is researched. According to the method for significantly improving the metal joint strength by using themetal complex, the interfacial strength between the metal and resin is improved through actions such as mechanical meshing force, chemical bonds and molecular winding; anodic oxidation is combined with a schiff base titanium complex process, and the single-lap shearing strength of TC4/PEEK reaches 47.5 MPa and is improved by 54.2% compared with a pure anodic oxidation sample (30.8 MPa); and the problems of interfacial stratification and damp-heat aging in fiber metal laminated plates are advantageously solved, the preparation process is simple, reaction conditions are controllable, and large-scale production and application can be achieved.

Description

technical field [0001] The invention belongs to the field of metal surface modification, and relates to a method for improving metal bonding strength by using metal complexes, in particular to the influence of Schiff base metal complexes on metal bonding strength. Background technique [0002] Fiber metal laminates, which were developed for high fatigue crack areas of civil aircraft in the early days, are super-hybrid laminates formed by alternate lamination of fiber composite materials and metal sheets and hot pressing. Hyper-hybrid laminates combine the excellent toughness of metals with the high strength, high modulus, and fatigue resistance of fiber composites to meet higher requirements in the aerospace field. [0003] There are multi-layer interfaces in the middle of fiber metal laminates. If the interface bonding performance is poor, the advantages of metal laminates such as excellent fatigue resistance, high damage tolerance, and high strength cannot be exerted. The...

Claims

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Application Information

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IPC IPC(8): C23C22/54C23C22/56C23C22/83C23C22/78C25D11/06C25D11/26
CPCC23C22/54C23C22/56C23C22/78C23C22/83C25D11/06C25D11/26
Inventor 潘蕾胡静玲丁文烨马文亮王斐庞小飞陶杰汪涛
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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