A method for electrodepositing nanocrystalline functional coatings on the surface of anodized porous metal substrates

A technology of anodic oxidation and porous metal, which is applied in the direction of anodic oxidation, metal material coating process, liquid chemical plating, etc. It can solve the problems of high chemical activity of titanium metal, difficulty in ensuring interfacial bonding force, and difficulty in growing functional coatings, etc. , to achieve good interfacial bonding, relieve growth stress, and avoid cracking

Active Publication Date: 2019-09-27
江苏柏瑞鑫铝业科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the current technical bottleneck is: the chemical activity of titanium metal is high, even after being pretreated by acid solutions such as HF acid, the exposed fresh Ti will spontaneously combine with O in the air. 2 reaction, promote the passivation of its surface into a dense oxide film, it is difficult to grow a functional coating on its surface, and due to the existence of the oxide film, the interface bonding force between the titanium substrate and the surface coating is difficult to guarantee

Method used

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  • A method for electrodepositing nanocrystalline functional coatings on the surface of anodized porous metal substrates
  • A method for electrodepositing nanocrystalline functional coatings on the surface of anodized porous metal substrates
  • A method for electrodepositing nanocrystalline functional coatings on the surface of anodized porous metal substrates

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Embodiment 1

[0033] In this embodiment, the TA2 high-purity titanium sheet is used as the base material, and the commercially rolled and annealed high-purity titanium is cut into flake-shaped titanium as the substrate, and the size is 5mm×2mm×0.5mm.

[0034] The method of electro-depositing nanocrystalline functional coatings on the surface of anodized porous metal substrates includes sequentially performing mechanical polishing on the surface of high-purity titanium substrates, degreasing with hot lye, anodizing, Pd 2+ -Sn 2+ Sensitization activation, Ni-P electroless plating and pulse electrodeposition nanocrystalline functional coating.

[0035] The concrete steps of described method are as follows:

[0036] The first step, mechanical polishing: use 800 # , 1200 # and 1500 # The SiC water sandpaper is used for rough grinding of the pure titanium substrate, and then Al 2 o 3 After polishing with polishing paste, after forming a mirror surface, observe the surface with a metallograp...

Embodiment 2

[0055] The difference from Example 1 is that the aging annealing treatment is performed before the pulse electrodeposited nanocrystalline functional coating, the treatment temperature is 450° C., the time is 1.5 h, and the furnace is air-cooled.

[0056] Compared with Example 1, the difference is that: 450°C×2.5h aging annealing treatment is carried out on the Ni-P electroless plating including the anodized film, its main function is to reduce the growth stress of the electroless Ni-P alloy and reduce the thickness of the coating. Cracking tendency; the dispersed phases such as Ni3P generated at the same time diffuse with Ti / TiO2 atoms in the titanium-based nanopores, which can promote the metallurgical combination of the interface.

[0057] The method is used to prepare a large-thickness (controllable) nanocrystalline functional coating on the surface of the anodic oxide film, which has a compact structure and excellent performance. The interface between the surface coating an...

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Abstract

The invention discloses a method for electrodepositing a nanocrystalline functional coating on the surface of a porous metal substrate based on anodic oxidation. 2+ -Sn 2+ Sensitization activation, Ni-P electroless plating and pulse electrodeposition nanocrystalline functional coating. The method of the present invention utilizes the electroless Ni-P film as a transition layer, which is beneficial to subsequent electrodeposition of multiple coatings, such as Ni, Cu, and the amorphous structure helps to refine the grain size of the subsequent coating; The aging treatment at low temperature in the method is beneficial to alleviate the growth stress of the Ni-P film and avoids the tendency of cracking; the method of the present invention is applicable to the surface modification of various active metals such as pure titanium, aluminum or magnesium; The Ni‑P thin film is used as a transition layer to electrodeposit a large thickness of nanocrystalline coating. The method of scratch test and cross-section observation is used to verify that the interface bonding force is good, and it can be used as an engineering surface material under general low-load and anti-wear conditions.

Description

technical field [0001] The invention belongs to the field of metal materials and relates to surface modification of metal materials, in particular to a method for electrodepositing a nanocrystalline functional coating on the surface of an anodized porous metal substrate. Background technique [0002] Due to the advantages of high specific strength, excellent corrosion resistance and high thermal stability, pure titanium and its alloys are widely used in aerospace, 3D printing materials, biomedicine and other fields. However, the wear resistance and weldability of the titanium alloy surface are poor in actual use, which severely limits its application range. [0003] In order to further improve the application range of pure titanium and its alloys, it is necessary to modify and strengthen its surface. Common surface modification technologies mainly include: mechanical alloying, laser surface coating, friction stir welding, plasma double-glow technology, physical and chemical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/18C25D5/34C25D11/02C23C18/32C23C18/18C23C28/02
Inventor 周小卫
Owner 江苏柏瑞鑫铝业科技有限公司
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