Processing of parts with metal coating sections of different shape

FIELD: process engineering.

SUBSTANCE: invention relates for surface processing to get glossy and dull sections. In compliance with this process, surface pre-coated with first copper ply and second ply including bottom nickel ply and top chromium ply is subjected to selective removal of chromium ply on sections to be frosted. Selective removal is performed by laser displaced above the surface. Note here that laser exposure and power are adjusted to get various texture. Then, ply of noncorrosive metal containing zirconium and chromium is evaporated from vapour phase on said surface.

EFFECT: production of glossy and frosted surface sections.

5 cl

 

The technical field to which the invention relates

The present invention relates to the field of coatings. In particular, it relates to a method for machining, which allows you to combine different gloss and Matt coatings on the same details.

The level of technology

Electrolytic chromium coatings are now used as decorative and protective layer against corrosion. These coatings are usually applied in electrolytic baths.

In these conventional tubs plastic is not a conductor, so it requires the complicated process of pre-processing to provide the ability to coat.

Currently developing new methods for the deposition of chromium coatings by physical vapour deposition (PVD), which allow you to use less toxic products. Technology PVD begins directly with applied solid material, followed by its conversion into steam by heating or irradiation with high-energy ions. The vapor condenses on the surface of the substrate, forming a thin layer. The method is performed in a vacuum or in a controlled atmosphere to prevent interaction between metal vapor with air. The method of coating by this method is described in the application ES 2239907 A1.

D�I create a chrome plating on plastic or on metal surfaces are first precipitated copper on the surface of the product. The thickness of this layer is about 20-25 microns. This is followed by deposition of Nickel with a thickness of about 15 microns and finally put chromium of a thickness of typically about 0.5 micron. In the case where it is assumed a matte finish, the last layer of Nickel must be Matt prior to the application of chromium. However, if items must be matte and shiny areas, the area or areas with the appearance that is different from most of the details should be included independently, creating additional complexity. Currently opaque areas can be obtained by partial deposition of organic layers on the chrome shiny surface. This solution has the problem of defining the boundaries of different coatings and durability required for outdoor use in automobiles, such as adhesion, scratch resistance, etc.

Disclosure of the invention

The purpose of the invention is to solve the technical problems mentioned in the previous section. For this purpose a method for processing parts to create on the surface of various glossy and shiny coating. The method includes performing a selective etching of the second layer on the surface previously covered with the first layer of copper and a second metal layer, and selective etching is carried out respectively on the section or sections which are to be matting unlike other�of the details.

Selective etching may be performed using the laser, which passes over a given area or areas of the surface of the coating. The laser is preferably a laser yttrium aluminum garnet (Yag) with a wavelength of 1064 nm and power of 100 watts. The second metal layer may be Nickel or Nickel and chromium as the top layer. In the first case is carried out the etching of the layer of Nickel, whereas in the second case, conduct etching of the chrome layer. After selective etching is applied another layer of non-corrosive metal (again chrome, steel or metals such as Zr, Au, Pt, Ru, In, etc.). These metals can be deposited on the details of PVD or by any other suitable means. Chromium can also be deposited by electrolysis before the etching, and at the final stage.

The implementation of the invention

The method of the invention is used on parts made of plastic material and metal, for example, those which are deposited on the layer of copper and Nickel as a preparation to the plating process. In the first implementation of the partial etching of the surface is performed on the Nickel layer, which allows to obtain adjacent parcels with different texture/sheen. Then detail chromium, for example, electrolytic plating.

In another implementation is carried out the etching of the surface layer of chromium on the details with layers of copper, Nickel� and chromium.

Selective etching is performed by laser, creating texture or Shine (gloss), which differs from previously protected surfaces.

If the etching is a chemical or scratching, areas that should not be processed and will be shiny, protect protective coating or masking coating, then the protection is removed.

Finally, a layer of non-corrosive metal may be deposited using PVD (sputtering, arc deposition, etc.), the conservation of the various levels of the received gloss or texture is provided as described above. The metals used in this last phase, are chromium, titanium, zirconium, indium, ruthenium, or noble metals such as gold or platinum. Different metals give details on coating various colors, glossy look of the plots previously treated with selective etching, detail is retained and protected from aggressive external influences. The final coating non-shiny areas may have different roughness or geometric shape, the use of a laser is preferred in this particular example. For striped coatings preferably, the etching scratching.

Chromium is deposited as the intermediate stage and the last stage may be electrolytic chamomile chrome applied PVD.

This way is achieved that the same parts have areas with different coatings without the need to enter the removable elements on different parts of the main body part or use a partially applied on the metal of the organic layers, and facilitates obtaining a homogeneous and stable in external and internal conditions of the surface of the component, for example, required in the automotive industry. So on the surface there are areas with different gloss depending on time of etching and the method used (from gloss to Mat, including gloss and all intermediate grades, the difference in thickness which can not be observed by the human eye without optical devices.

Under selective etching means that intended for the treatment plots pre-selected and modified to partially change the texture and Shine of a previously deposited layer of Nickel or chromium. This gives the selected surface appearance different from main shiny surface.

Selective laser etching is performed, for example, Yag-laser with a wavelength of 1064 nm and power of 100 watts.

You can make application with other types of laser with similar characteristics.

Various coatings can be obtained by varying the power and time dei�the third laser which gives different nuances and details, from closest to the mirror tone (shiny area) to a more or less matte coating or coating with a certain texture.

1. Method of treatment of parts for creating a surface with shiny and matte areas, which on the surface, previously coated with a first layer of copper and a second layer comprising a lower layer of Nickel and another top layer of chromium, perform selective removal of the second layer, and the selective removal of the second layer is carried out at the site or sites subject to matting, unlike the rest of the parts by means of laser yttrium aluminum garnet with a wavelength of 1064 nm and power of 100 W, which moves over the surface, matarua the desired area or areas, characterized by the fact that what is the duration and the laser power adjust to get different textures, and selective removal is performed on the chromium layer, and after performing the selective removal of the surface by physical vapor deposition (PVD) is applied another layer of non-corrosive metal containing Zr and Cr.

2. A method according to claim 1, wherein the selective removal of the chrome layer is performed until reaching the underlying layer of Nickel.

3. A method according to claim 1, wherein chromium is deposited by electrolysis.

4. A method according to any one of claims. 1-3, in which the part of fullment�and of plastic material.

5. A method according to any one of claims. 1-3, in which the part is made of metal.



 

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