WO2018067148A1 - Substrat en alliage à revêtement extérieur - Google Patents

Substrat en alliage à revêtement extérieur Download PDF

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Publication number
WO2018067148A1
WO2018067148A1 PCT/US2016/055598 US2016055598W WO2018067148A1 WO 2018067148 A1 WO2018067148 A1 WO 2018067148A1 US 2016055598 W US2016055598 W US 2016055598W WO 2018067148 A1 WO2018067148 A1 WO 2018067148A1
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WIPO (PCT)
Prior art keywords
coat
alloy
electrically conductive
alloy substrate
layer
Prior art date
Application number
PCT/US2016/055598
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English (en)
Inventor
Yong-jun LI
Kuan-Ting Wu
Xiao-jun ZHU
Original Assignee
Hewlett-Packard Development Company, L.P.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hewlett-Packard Development Company, L.P. filed Critical Hewlett-Packard Development Company, L.P.
Priority to US16/323,088 priority Critical patent/US20190177858A1/en
Priority to PCT/US2016/055598 priority patent/WO2018067148A1/fr
Priority to CN201680088908.XA priority patent/CN109790625A/zh
Priority to EP16918429.8A priority patent/EP3478873A4/fr
Publication of WO2018067148A1 publication Critical patent/WO2018067148A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
    • B05D3/107—Post-treatment of applied coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/546—No clear coat specified each layer being cured, at least partially, separately
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/026—Anodisation with spark discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/20—Metallic substrate based on light metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/20—Metallic substrate based on light metals
    • B05D2202/25—Metallic substrate based on light metals based on Al
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/30—Metallic substrate based on refractory metals (Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
    • B05D3/141—Plasma treatment
    • B05D3/145—After-treatment
    • B05D3/148—After-treatment affecting the surface properties of the coating

Definitions

  • Metai alloys exhibit a wide variety of characteristics that make them suitable for different applications ranging from commercial and industrial materials to military and medical equipment, in general, the type of properties possessed by a metai alloy is determined by the constituents of the metal alloy. The properties possessed by a metal alloy, in turn determine use of the metal alloy for a given application.
  • the properties and characteristics of the metai alloys can be customized during manufacturing of the alloys, depending upon composition of the alloy, and process used for fabricating such alloys.
  • the process of manufacturing metai alloys is generally a controlled process.
  • the composition of the alloy as well as tiie process parameters are monitored to obtain a metal alloy having characteristics in accordance with an end application.
  • FIG. 1 illustrates a sectional view of an die-casted metal aiipy with an exterior coat deposition, in accordance with an implementation of the present subject matter
  • FIG. 2 illustrates different stages of treating a surface of an alloy substrate for depositing an exterior coat, according to an implementation of the present subject matter
  • FIG. 3 illustrates an example method for treating a surface of an alloy substrate, according to an implementation of the present subject matter.
  • Fig.4 illustrates an example method for depositing an exterior coat on an alloy substrate, according to an implementation of the present subject matter.
  • metal alloys such as magnesium alloys, titanium alloys and aluminum alloys have high surface porosity with large number of pores and cavities on their surfaces.
  • the pores and cavities make the surface uneven, hard and chemically unstable for coating with other materials.
  • Such large number of pores and cavities may also provide reduced surface contact of an applied material with the surface of the metal alloys and prevent the applied material to have sufficient binding with the surface.
  • the surface of the metal alloys is also reactive and tend to oxidize with gases of the atmosphere to form an unstable oxide layer on the surface.
  • the unstable oxide layer reduces stability of the surface for adhering to an exterior coat, and makes the surface chemically resistant towards different materials.
  • the surface of the metal alloys are generally subjected to multiple surface treatment processes, followed by deposition of a putty and the exterior coat
  • the multiple surface treatment processes make the overall process of treating the surface and applying the exterior coat complex, time and resource consuming.
  • an alloy substrate of a die-casted metal alloy is received.
  • the die- casted metal alloy is obtained through casting or molding of molten metal alloy in a die or a mold, and then cooling and solidifying are performed to obtain the alloy substrate.
  • the surface of the alloy substrate is porous having multiple pores on the surface.
  • an electrically conductive layer is deposited on the surface of the alloy substrate.
  • the electrically conductive layer is deposited on the surface to cover the surface entirely.
  • the electrically conductive layer may be deposited through a spraying technique or may be deposited manually.
  • the electrically conductive layer may be composed of metal particles and electrically conductive polymers.
  • the surface is subjected to a machining process that may include scrubbing and polishing of the surface. During machining, excess material of electrically conductive layer may be removed and the surface Is made smooth by allowing the metal particles to fill the pores, thereby reducing porosity of the surface.
  • the surface of the alloy substrate is oxidized based on an oxidation process to form an oxidation layer on the surface.
  • the oxidation layer so formed provides stability to the surface for adhering to exterior coats and insulates the surface from the outside environment to prevent direct exposure of the surface to the environment and reduce reactivity of the surface and corrosion.
  • an exterior coat including at least one coating layer is deposited on the surface of the alloy substrate. The exterior coat may provide a smooth and lustrous appearance to the alloy substrate.
  • the described techniques of depositing the electrically conductive layer and performing the oxidation efficiently reduce porosity and reactivity of the surface and enhance binding of an applied exterior coat with the surface. Further, the techniques provide a time and resource efficient mechanism of treating the surface and making the surface stable for coating.
  • Fig. 1 illustrates a sectional view of a dte-casted metal alloy 100 with an exterior coat deposition, according to an implementation of the present subject matter,
  • the die-casted metal alloy 100 possesses a uniform surface devoid of pores and is obtained on subjecting an alloy substrate 102 to a surface treatment process, as per techniques described in herein.
  • the description of the surface treatment process is provided in details with reference to subsequent figures.
  • the alloy substrate 102 is composed of a metal alloy, for instance, a magnesium alloy, a titanium alloy, or an aluminum alloy.
  • the alloy substrate 102 may be fabricated through techniques of manufacturing alloys, such as molding or die-casting of the metal alloy using a die wherein a molten metal alloy is poured and then allowed to cod to take the shape of the die.
  • various imperfections, such as gas and air entrapment? may occur that result in formation of pores and cavities on the surface of the alloy substrate 102.
  • the die-casted metal alloy 100 has an electrically conductive layer 104 deposited over tine alloy substrate 102.
  • the electrically conductive layer 104 is composed of single or multiple layers of metal particles and electrically conductive polymers.
  • the metal particles include one of aluminum particles, magnesium particles, and titanium particles and the electrically conductive polymers can be one of polylactene, polyphenylenevinylene, poiythienylenevinyiene, polythiophene, poly-3-alkylthiopene, poiypyrrole, polyaniline, polyphenylene, polyphenylene sulfide and polyfuran, and po)y-3,4-ethylenedioxythiopene polystyrene sulfonate (PEDOT).
  • the electrically conductive layer 104 reduces porosity of the surface by allowing the metal particles of the electrically conductive layer 104 to fill the pores and cavities of the surface of the alloy substrate 102.
  • the die-casted metal alloy 100 includes an oxidation layer 106.
  • the oxidation layer 106 is a dense ceramic protective layer that provides hardness and stability to the surface for binding with exterior coats and insulates the surface from the outside environment thereby reducing reactivity of the surface, in an example, the oxidation layer 106 may be a magnesium oxide (MgO) layer with a thickness of about 3-15 micro meter (pm).
  • MgO magnesium oxide
  • the die-casted metal alloy 100 includes an exterior coat 108 disposed on the oxidation layer 106.
  • the exterior coat 108 may have a coating layer, such as a paint coat having several paint layers coated on the die-casted metal alloy 100 to provide a color and a texture to the surface.
  • the coating layer may be a metallic coat composed of metallic powders. Such metallic coats provide a metallic luster to the surface of the alloy substrate 102.
  • the exterior coat 108 makes the alloy substrate 102 water resistant smooth, and soft and imparts an anti-bacteriaf, anti-smudge and anti-fingerprint characteristics to the alloy substrate 102.
  • the die-casted metal alloy 100 with the exterior coat having such characteristics may be used for applications in electronic devices, such as making back covers and housings for laptops, notebooks, and smaitphones.
  • Fig. 2 illustrates various stages 200 of treating the surface of a metal alloy, implemented by various unite, according to an example implementation of the present subject matter.
  • a unit in context of the present description, can be an apparatus, a machine or a combination of apparatuses or machines tor performing an operation at a stage.
  • different units interact with the alloy substrate 202 to add the different layers deposited over the surface of the alloy substrate 202 to create the die-casted metal alloy, such as the above-described die-casted metal alloy 100.
  • the alloy substrate 202 is obtained for surface treatment and exterior coat deposition.
  • the alloy substrate 202 is then subjected to application of an electrically conductive layer 206 by an applying unit 204.
  • the applying unit 204 may be a spraying apparatus or multiple spraying apparatuses for spraying electrically conductive material on the surface of the alloy substrate 202 to form the electrically conductive layer 206 on the alloy substrate 202.
  • the electrically conductive layer 206 may be deposited manually. In manual deposition, an amount of fluid electrically conductive material is poured on the alloy substrate 202 to cover the surface of the alloy substrate 202 and the conductive material is spread over the surface using a spreading apparatus, such as a plastic knife.
  • the electrically conductive layer 206 is alike the electrically conductive layer 104 described earlier and is composed of metal particles and conductive polymers, in an example, the electrically conductive layer 206 allows formation of a ceramic oxide layer over the surface of the alloy substrate 202.
  • the ceramic oxide layer is composed of the metal particles that are filled in the pores and cavities of the surface of the alloy substrate 202.
  • the alloy substrate 202 with the electrically conductive layer 206 is then subjected to a machining process implemented by a machining unit 208.
  • the machining unit 208 may include machining tools and a polishing equipment for removal of excess electrically conductive material from the surface and scrub or brush the remaining conductive material to polish the surface.
  • polishing is performed by rotating the polishing equipment on the surface of the electrically conductive layer 206. The polishing of the surface allows the metal particles of the electrically conductive layer 206 to fill the pores and cavities of the surface to smoothed the surface and reduce porosity of the alloy substrate 202.
  • a machined alloy substrate 210 is obtained.
  • an oxidation process is performed on the machined alloy substrate 210 by an oxidation unit 212.
  • the oxidation process may be a Micro Arc Oxidation (MAO) and the oxidation unit 212 may include electrodes, a container with an electrolyte, and transducers for performing the MAO of the alloy substrate 202, and form an oxidation layer 214 on the surface of the machined alloy substrate 210.
  • the MAO may be performed at a voltage of about 160-350 Volts (V) at a temperature of about 10-45 degree Celsius (°C) for a duration of about 2-10 minutes.
  • the chemicals may be used during the MAO, for instance, as electrolyte or for aqueous solutions used for oxidation.
  • the chemicals includes sodium silicate, metal phosphate, potassium fluoride, potassium hydroxide or sodium hydroxide, fluorozirconate.
  • the chemicals may be used along with water with the composition of about 0.05-15 percent (%) of the amount of water at a pH value of about 8-13.
  • the MAO enhances adhesion of the surface of the alloy substrate 202 with exterior coats applied on the alloy substrate 202 and prevents surface peeling issues.
  • an exterior coat 216 is applied on the machined alloy substrate 210 by a coating unit 218.
  • the coating unit 218 may be a paint apparatus or a spraying apparatus for spraying exterior coat material on the alloy substrate 202.
  • the exterior coat 216 may include at least one coating layer.
  • the coating layer may be a paint coat having a paint layer or several paint layers.
  • the paint layers may be of different colors and appearances.
  • the paint layers include a single layer of an Ultraviolet (UV) coat or a Polyurethane (PU) coat in another example, the paint layers include a base coat along with either the UV coat or the PU coat.
  • the coaling layer of the exterior coat 216 may include a metallic coat, such as a metallic UV coat or a metallic PU coat
  • the metallic coat is deposited over the surface to provide a metallic lustre to the alloy substrate 102.
  • the metallic UV coat is deposited at a temperature of about 50-55°C, with 600 - 1000 Millijoules (mj) UV exposure for a duration of about 10-12 minutes.
  • the metallic UV coat is composed of pearl, metal powders, dyes and color pigments
  • the metallic UV coat may be composed of resins, such as polyurethane, polycarbonate, urethane acrylates, polyacrylate, polystyrene, polyetheretherketone, polyacryletheretherketone, polyesters, fluoropolymers, and a mixture of the resins.
  • the thickness of the metallic UV coat is about 10-25 pm.
  • the metallic PU coat may be composed of polyurethane or urethane acrylates. In an example, the thickness of the metallic PU coat is about 5 - 20 pm. in an example implementation, the metallic PU coat may be deposited in two layers, a base coat (not shown in the figure) and a top coat (not shown in the figure). In an example, the base coat is deposited at a temperature of about 80-150 °C for a duration of about 20-40 minutes.
  • the base coat may be composed of barium sulfate, talc, dyes, metal powders and color pigments.
  • the base coat may also include base coat resin, such as po!yuretnane and acryJic-potyurethane and may contain aluminum particles for metallic luster. Thereafter, the top coat may be deposited at a temperature of about 80-140°C for about 20-40 minutes.
  • the coating layer of the exterior coat 216 may include a primer and a powder coat (not shown in the figure) deposited on the oxidation layer 214 prior to depositing the metallic UV coat.
  • the primer and the powder coat may be deposited to enhance adhesion and durability of exterior coats on sharp edges of the surface.
  • the primer may be composed of resin such as epoxy, acryiic-epoxy hybrids, acrylics, polyurethane and acrylic-poiyurethane.
  • the primer may also contain fillers from a group of carbon black, titanium dioxide, clay, mica, talc, barium sulphate, calcium carbonate, synthetic pigments, metallic powders, aluminium oxide, CNT, graphene, graphite, organic and inorganic powders.
  • the powder coat is composed of high ratio fillers such as talc, clay, graphene and high aspect ratio pigments. Further, the powder coat may include epoxy, poly (vinyl chloride), poiyamides, polyesters, polyuretiianes, acrylics, polyphenylene ether.
  • the primer resin may be subjected to a temperature of about 80-160°C for about 20 - 40 minutes, in an example, the powder coat and the primer may contain fillers from carbon black, titanium dioxide, clay, mica, talc, barium sulphate, calcium carbonate, synthetic pigments, metallic powders, aluminium oxide, CNT, graphene, graphite, organic and inorganic powders,
  • a die- casted metal alloy 220 having the substrate alloy 202 with the exterior coat 216 as the top most layer is received.
  • the described techniques provide for a surface treatment process including depositing an electrically conductive layer and an oxidation layer to reduce porosity and reactivity of the alloy substrate 102.
  • Fig. 3 and Fig. 4 illustrate methods 300 and 400 for treating surface of an alloy substrate for deposition of exterior coats.
  • the order in which the methods 300 and 400 is described is not intended to be construed as a limitation, and any number of the described method blocks may be combined in any order to implement the methods 300 and 400, or an alternative method.
  • Fig. 3 illustrates the method 300 for treating surface of an alloy substrate, according to an example implementation of the present subject matter.
  • the surface of the alloy substrate generally has large number of pores and cavities that makes the surface uneven and resistant for coating with different materials. Further, the surface is also reactive with gases of the atmosphere and is unstable for holding exterior coats applied on the surface. Therefore, to reduce porosity and reactivity of the surface and make the surface stable for adhesion with exterior coats, a surface treatment process is performed.
  • the exterior coat may be a single layer or multiple layers of paint material or a metallic coat deposited on the alloy substrate for providing smooth and lustrous appearance to the alloy substrate.
  • an electrically conductive layer is applied on the alloy substrate.
  • the electrically conductive layer is composed of metal particles and electrically conductive polymers.
  • the electrically conductive layer is applied such that the metal particles fill the multiple pores on the surface of the alloy substrate.
  • the alloy substrate is subjected to an oxidation process to form an oxidation layer over the surface.
  • the oxidation layer provides for adhesion of the surface with an exterior coat
  • the alloy substrate 102 with the exterior coat is a die-casted metal alloy, such as the above-described die-casted metal alloy 100 and 220 with characteristics of a surface quality that may be used in various applications, for example, making housing and back covers of electronic devices.
  • Fig. 4 illustrates the method 400 for treating surface of an alloy substrate and deposit an exterior coat, according to another example implementation of the present subject matter.
  • an alloy substrate is received.
  • the alloy substrate is a die-casted metal alloy and has a surface which is porous with multiple pores and cavities.
  • the alloy substrate may be obtained alter molding or die-casting of the metal alloy in a die or a mold and the pores and the cavities may be due to imperfections, such as gas and air entrapment during molding or die- casting of the metal alloy.
  • an electrically conductive layer is deposited on the surface of the alloy substrate.
  • the electrically conductive layer is composed of metal particles and electrically conductive polymers.
  • fine metal particles can be one of aluminum particles, magnesium particles, and titanium particles and the electrically conductive polymers can be one of polylactene, polyphenylenevinylene, polythienylenevinylene, polythiophene, poly-3-alkylthiopene, po!ypyrrole, polyaniline, polyphenylene, polyphenylene sulfide and polyfuran, and pdy-3,4-ethyienedioxythiopene polystyrene sulfonate (PEDOT).
  • the electrically conductive layer 104 may be deposited over the alloy substrate 102.
  • the surface of the alloy substrate is subjected to a machining process to smoothen the surface by allowing the metal particles to fill pores of the alloy substrate, at block 406. Therefore, the machining process reduces porosity of the surface of the alloy substrate 102.
  • the machining process may include scrubbing, brushing or polishing of the surface to remove excess electrically conductive material from the surface of the alloy substrate.
  • an oxidation process is performed onto the surface to oxidize the surface and form an oxidation layer on the surface.
  • the oxidation layer provides stability to the alloy substrate to adhere to exterior coats and reduces reactivity of the alloy substrate.
  • the oxidation layer also provides hardness to the alloy substrate, in an example implementation, the oxidation process is the MAO process and the oxidation layer 106 is formed over the surface of the alloy substrate 102.
  • the exterior coat is deposited on the surface of the alloy substrate.
  • the exterior coat may include a single coating layer or multiple coating layers.
  • the exterior coat may be a paint coat with a color and a smooth texture.
  • the exterior coat may be deposited to provide a lustrous appearance to the alloy substrate with anti-bacterial, anti-fingerprint, anti-smudge and water resistant characteristics.
  • the exterior coat may be a metallic coat composed of metallic powders, pearl, dyes, and color pigments.
  • the metallic coat may include a metallic Ultraviolet (UV) coat or a metallic PU (Polyurethane) coat.
  • UV Ultraviolet
  • metallic PU Polyurethane
  • the metallic coat provides a metallic luster appearance to the alloy substrate 102.
  • the alloy substrate coated with the metallic coat may men be used for application in electronic devices as back cover for laptop, notebook and smartphones.
  • the die-casted metal alloy obtained by the described method of surface treatment may be used for various purposes where a metal alloy sheet with non-porous surface having high adherence to exterior coating is desired.
  • the die-casted metal ailoy may be used to manufacture back covers for electronic devices, such as laptops and smart phones.
  • the described techniques efficiently reduce porosity and reactivity of the metal alloys to enhance binding between an exterior coat and the surface of the metal alloys. Further, the described techniques provide a time and resource efficient mechanism of treating the surface of the metal alloys.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

Des exemples se rapportant au revêtement d'un substrat en alliage sont décrits. Par exemple, des techniques, visant à traiter une surface du substrat en alliage afin d'appliquer sur le substrat en alliage une couche extérieure, consistent à produire un substrat dans un alliage métallique coulé, le substrat en alliage comportant une surface pourvue de multiples pores, et appliquer une couche électroconductrice sur la surface du substrat en alliage. La surface électroconductrice est composée de particules métalliques et de polymères électroconducteurs, et la couche électroconductrice est appliquée de sorte que les particules métalliques remplissent les multiples pores sur la surface du substrat en alliage. Ensuite, un processus d'oxydation est effectué sur la surface pour former une couche d'oxydation sur celle-ci. La couche d'oxydation assure l'adhérence de la surface avec la couche extérieure.
PCT/US2016/055598 2016-10-05 2016-10-05 Substrat en alliage à revêtement extérieur WO2018067148A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US16/323,088 US20190177858A1 (en) 2016-10-05 2016-10-05 Coating an alloy substrate
PCT/US2016/055598 WO2018067148A1 (fr) 2016-10-05 2016-10-05 Substrat en alliage à revêtement extérieur
CN201680088908.XA CN109790625A (zh) 2016-10-05 2016-10-05 具有外部涂层的合金基底
EP16918429.8A EP3478873A4 (fr) 2016-10-05 2016-10-05 Substrat en alliage à revêtement extérieur

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WO2021092852A1 (fr) * 2019-11-14 2021-05-20 Hewlett-Packard Development Company, L.P. Enceintes à finition en céramique à brillant élevé
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EP3478873A1 (fr) 2019-05-08
US20190177858A1 (en) 2019-06-13
CN109790625A (zh) 2019-05-21

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