EP0414025A1 - Objet recouvert d'une couche de protection - Google Patents

Objet recouvert d'une couche de protection Download PDF

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Publication number
EP0414025A1
EP0414025A1 EP90115056A EP90115056A EP0414025A1 EP 0414025 A1 EP0414025 A1 EP 0414025A1 EP 90115056 A EP90115056 A EP 90115056A EP 90115056 A EP90115056 A EP 90115056A EP 0414025 A1 EP0414025 A1 EP 0414025A1
Authority
EP
European Patent Office
Prior art keywords
layer
substrate
object according
aluminum
cast
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP90115056A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jacques Müller
André Triponez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETA SA Manufacture Horlogere Suisse
Ebauchesfabrik ETA AG
Original Assignee
Ebauchesfabrik ETA AG
Eta SA Fabriques dEbauches
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 Ebauchesfabrik ETA AG, Eta SA Fabriques dEbauches filed Critical Ebauchesfabrik ETA AG
Publication of EP0414025A1 publication Critical patent/EP0414025A1/fr
Withdrawn legal-status Critical Current

Links

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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12611—Oxide-containing component

Definitions

  • the present invention relates to a decorative and / or utility object, used in particular in watchmaking or in jewelry, comprising a metal substrate constituting the framework of the object and a protective coating covering said substrate at least in part to make it insensitive. external constraints that may arise.
  • protective coatings generally consisting of deposits of thin layers using, for example, nickel or chromium.
  • a particularly effective and pleasant appearance protection consists in coating the object with an aluminum oxide if the base substrate is pure aluminum or an aluminum alloy.
  • Japanese publication JP-A-59-40 916 describes such a treatment on a watch case whose substrate is made of aluminum alloy.
  • This treatment consists in anodically oxidizing the substrate in a 10-20% solution of sulfuric acid maintained between -4 and 10 ° C, solution in which air is introduced as an agitator.
  • the electric voltage and current density are gradually increased from 24 to 90 V and from 2 to 7 A / dm2 respectively, so that a layer of aluminum oxide is created which has crystal growths on the surface of the substrate.
  • the oxide layer is then impregnated with an aqueous liquid containing a fluorocarbon polymer having particles in the form of grains whose size is smaller than 2 ⁇ m and which are placed between the crystalline growths to finally come close off the holes existing between said growths. Thanks to this method, the wear resistance of the visible parts of the watch case is improved.
  • this substrate could be made of a material other than pure aluminum, such as steel, brass or even cast aluminum for example, which would then be covered with a first layer of aluminum in a substantially pure state, then a second layer covering the first, said second layer consisting of aluminum oxide formed from said first layer, as proposed by the present invention.
  • This first example is a preferred embodiment of the invention in which the substrate, which constitutes the framework of the object to be manufactured, is produced by means of cast aluminum which can be cast or injected into a mold for give it its final form.
  • Cast aluminum however, has a high silicon content which is present to facilitate molding.
  • This high silicon content between 5 and 22% by weight, has a major drawback when it comes to anodizing the molded part. Indeed, the silicon particles prevent regular anodization, which results in an irregular surface state with welts or mottling resulting in a surface state unusable for the sale of the object.
  • the present invention therefore proposes to coat the cast aluminum part with a first layer of aluminum in a substantially pure state, the silicon content of which is low, for example less than 0.5 %.
  • This first deposition can be carried out by ordinary galvanic means, but could also be applied in another way, by physical vapor deposition (PVD) for example.
  • PVD physical vapor deposition
  • the aluminum oxide surface is produced by electrolysis, using metal as the anode.
  • the second layer may have a thickness of between 2.5 and 200 ⁇ m.
  • sulfuric acid an oxalic acid or a chromic acid can also be used.
  • the second oxide layer makes it possible to provide an object of great surface hardness and resistant to chemical agents.
  • This second layer also has the advantage that it can be colored either by dyeing the layer or by adding different metals to the oxidation bath. It will be added that if a layer thickness of 10 ⁇ m is necessary to resist corrosion and wear, at least a thickness of 20 ⁇ m will be necessary to obtain good coloring.
  • the object in question may be another decorative object. It can for example be a bracelet link which can be molded with shapes as complicated as desired, which moreover is often the case for links nested one after the other.
  • the substrate of this second embodiment is made from cast zinc.
  • the alloy of the Zamak type (registered trademark) is preferably used, which comprises by weight 3 to 6% of aluminum, 1.2 to 3.2% of copper and traces of other metals.
  • the cast iron is cast or injected into a mold, then the substrate obtained is covered with the same layers as those which have been described in Example No. 1.
  • Zinc cast iron has the same advantages as cast aluminum, in that the object obtained does not need to be machined since it immediately presents itself in its finished form.
  • the substrate is coated with the two layers described in Example No. 1. If the machining has the disadvantages mentioned above, the anodized aluminum coating, on the other hand, has the advantages which have been mentioned: hardness, good satin appearance and, optionally, coloring.
  • the substrate is made of brass which is subsequently machined. After machining, the substrate is coated with the two layers described in Example No 1. This embodiment has the same advantages and disadvantages mentioned in connection with Example No 3.
  • the object of the invention proposes, as can be seen from all the examples set out above, the deposition of a layer of substantially pure aluminum on the substrate. If this deposition is carried out by galvanic plating, the electrode or electrodes used for this purpose will leave after plating one or more places of the substrate which have not been covered by the first layer of aluminum. If the substrate is made of zinc cast iron, steel or brass, the subsequent anodic oxidation operation will lead to chemical attack on the substrate in unplated areas, to the point of possibly causing the substrate to pierce. When using the substrates which have just been mentioned, it will therefore be necessary to cover the contact areas of the electrodes with an acid-insensitive material used for anodization.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Adornments (AREA)
  • Laminated Bodies (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Physical Vapour Deposition (AREA)
  • Dental Preparations (AREA)
EP90115056A 1989-08-25 1990-08-06 Objet recouvert d'une couche de protection Withdrawn EP0414025A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3086/89 1989-08-25
CH308689A CH676650GA3 (enrdf_load_stackoverflow) 1989-08-25 1989-08-25

Publications (1)

Publication Number Publication Date
EP0414025A1 true EP0414025A1 (fr) 1991-02-27

Family

ID=4248315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90115056A Withdrawn EP0414025A1 (fr) 1989-08-25 1990-08-06 Objet recouvert d'une couche de protection

Country Status (6)

Country Link
US (1) US5029149A (enrdf_load_stackoverflow)
EP (1) EP0414025A1 (enrdf_load_stackoverflow)
JP (1) JPH03118001A (enrdf_load_stackoverflow)
KR (1) KR910004841A (enrdf_load_stackoverflow)
CN (1) CN1049687A (enrdf_load_stackoverflow)
CH (1) CH676650GA3 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273679A1 (de) * 2001-07-05 2003-01-08 CemeCon AG Metallisches Bauteil mit äusserer Funktionsschicht und Verfahren zu seiner Herstellung

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVI20040032U1 (it) * 2004-11-23 2005-02-23 Italo Bottene Ossido duro di alluminio ed al titanio per fare gioielli con metalli preziosi, pietre dure e/o diamanti
DE102007004570A1 (de) * 2007-01-30 2008-07-31 Daimler Ag Glänzende Beschichtungen für Aluminium- oder Stahloberflächen und deren Herstellung
US20100307671A1 (en) * 2009-06-08 2010-12-09 Zoltan David Metal ornamentation method
ITAR20130035A1 (it) * 2013-09-06 2015-03-07 Gen Preziosi S R L Metodo di produzione di articoli di oreficeria, gioielleria e bigiotteria
EP3587626B1 (fr) * 2018-06-28 2023-02-22 Comadur S.A. Pièce décorative réalisée par incrustation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE28527E (en) * 1970-01-13 1975-08-26 Watch case
FR2360112A1 (fr) * 1976-07-29 1978-02-24 Ducommun Georges Element de montre et procede de fabrication
GB2071153A (en) * 1980-02-27 1981-09-16 Citizen Watch Co Ltd Method for manufacturing a bicoloured polyhedral body of aluminium

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5940916A (ja) * 1982-08-31 1984-03-06 Mitsuru Yamanaka 自動車用暖房装置における初期暖房装置
JPS61201798A (ja) * 1985-03-01 1986-09-06 Citizen Watch Co Ltd 腕時計用外装部品

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE28527E (en) * 1970-01-13 1975-08-26 Watch case
FR2360112A1 (fr) * 1976-07-29 1978-02-24 Ducommun Georges Element de montre et procede de fabrication
GB2071153A (en) * 1980-02-27 1981-09-16 Citizen Watch Co Ltd Method for manufacturing a bicoloured polyhedral body of aluminium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
horological journal no. 111, août 1968, 2/6 pages 22 - 24; B.MORGAN: ""all that glisters"" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273679A1 (de) * 2001-07-05 2003-01-08 CemeCon AG Metallisches Bauteil mit äusserer Funktionsschicht und Verfahren zu seiner Herstellung
DE10132089A1 (de) * 2001-07-05 2003-01-30 Cemecon Ceramic Metal Coatings Metallisches Bauteil mit äußerer Funktionsschicht und Verfahren zu seiner Herstellung

Also Published As

Publication number Publication date
US5029149A (en) 1991-07-02
JPH03118001A (ja) 1991-05-20
KR910004841A (ko) 1991-03-29
CN1049687A (zh) 1991-03-06
CH676650GA3 (enrdf_load_stackoverflow) 1991-02-28

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