US2965551A - Metal plating process - Google Patents

Metal plating process Download PDF

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Publication number
US2965551A
US2965551A US676722A US67672257A US2965551A US 2965551 A US2965551 A US 2965551A US 676722 A US676722 A US 676722A US 67672257 A US67672257 A US 67672257A US 2965551 A US2965551 A US 2965551A
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United States
Prior art keywords
coating
bath
metal
nickel
current
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Expired - Lifetime
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US676722A
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English (en)
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Richaud Henri
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Pechiney SA
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Pechiney SA
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/18—Pretreatment of the material to be coated
    • C23C18/1803—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces
    • C23C18/1824—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces by chemical pretreatment
    • C23C18/1837—Multistep pretreatment
    • C23C18/1844—Multistep pretreatment with use of organic or inorganic compounds other than metals, first
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/18—Pretreatment of the material to be coated
    • C23C18/1803—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces
    • C23C18/1848—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces by electrochemical pretreatment
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/31—Coating with metals
    • C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
    • C23C18/34—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents
    • C23C18/36—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents using hypophosphites
    • 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
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/18—Pretreatment of the material to be coated
    • C23C18/1803—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces
    • C23C18/1806—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces by mechanical pretreatment, e.g. grinding, sanding
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S205/00—Electrolysis: processes, compositions used therein, and methods of preparing the compositions
    • Y10S205/916—Sequential electrolytic and nonelectrolytic, or nonelectrolytic and electrolytic coating from the same bath

Definitions

  • the coating of a metal surface with a cover layer of another metal or other metals is greatly facilitated by the process according to my invention, which comprises the preliminary treatment of the metal surface to be coated prior to plating the same with the desired coating metal or metals by the step of electrolytic oxidation of that surface in the presence of at least one compound of that aforesaid coating metal or metals, and in a medium containing at least one reducing agent.
  • the metal surface to becoated is first anodically oxidized and immersed in a solution which contains simultaneously a compound of the desired coating metal or metals, and a. reducing agent. It is preferred to have the base metal connected to the source of electric current at the moment of immersing the base, metal surface into the aforesaid solution, so that current passes through the contact sur face from the very first instant of establishing contact between the metal surface and the solution constituting the oxidation bath.
  • This preferably brief step of oxidizing the metal surface to be coated is controlled in such a manner that a thin oxidic layer is formed on the metal surface to be coated.
  • the duration of this anodic oxidation step variesbetween a few seconds and up to one minute.
  • the oxidic layer is of a thickness below 20 microns, and preferably between 0.1 and 10 microns. Especially favorable results are obtained if oxide layers are allowed to form the thickness of which varies between 0.2 and 2 microns, and, in the case of aluminum and its alloys, more particularly between 0.5 and 1 micron.
  • This anodic oxidation step according to my invention can be carried out with the aid of different types of electric current such as direct, alternating or undulatory current at carefully chosen rates of current density and voltage.
  • the oxidizing step in the process according to my invention is preferably preceded by conventional cleansing steps such as mechanical polishing, degreasing with organic agents such as trichloroethylene, and/or cathodic cleaning followed by rinsing with distilled water.
  • conventional cleansing steps such as mechanical polishing, degreasing with organic agents such as trichloroethylene, and/or cathodic cleaning followed by rinsing with distilled water.
  • an oxidation bath Prior to carrying out the step of anodic oxidation, an oxidation bath is prepared, which comprises at least one compound of the desired coating metal or metals and at least one reducing agent, and the pH value of this oxidation bath is adjusted, by a conventional addition of an acidic or basic agent, to a determined optimal pH, which is, by way of example only in the range of preferably 0.5 to 4.8 in the case of aluminum alloys to be coated with nickel.
  • the process according to the invention can be used in a variety of applications in the field of metal plating, and particularly in coating metal surfaces with protective, well adherent cover layers of chromium, copper, cadmium, nickel, silver, gold, zinc and others.
  • These coating metals may be applied, in acidic or alkaline baths, as the case may be, to a great variety of suitable base metals such as: aluminum, magnesium, titanium, uranium, beryllium, zirconium, iron, copper, zinc, nickel, and their different alloys.
  • suitable base metals such as: aluminum, magnesium, titanium, uranium, beryllium, zirconium, iron, copper, zinc, nickel, and their different alloys.
  • the bath in which the anodic oxidation step according to my invention is to be carried out should contain simultaneously, at least one compound of the coating metal or metals, and a reducing agent. While it is preferable to have present in the solution a cation of the desired metal, it is also possible to use a solution containing a compound of the coating metal which is little or completely un-ionized. Therefore, salts of the coating metal or metals, such as sulfates, chlorides, fluorides, perchlorates, acetates and the like are suitable, but so are cyano complexes, tartrates and different other organic compounds of the coating metal or metals, contained singly or in combination with each other, in the oxidation bath.
  • salts of the coating metal or metals such as sulfates, chlorides, fluorides, perchlorates, acetates and the like are suitable, but so are cyano complexes, tartrates and different other organic compounds of the coating metal or metals, contained singly or in combination with each
  • Reducing agents in the oxidation bath which are useful in carrying out my invention in practice, can be of Widely varying nature, depending on the nature of base metals and on the coating metals to be applied thereto.
  • reducing salts such as sulfites, thiosulfates, hydrosulfites, arsenites, phosphites or hypophosphites, preferably in the form of their sodium or potassium salts, as well as the salts of metals of less than their maximum valency according to the periodic table can be used.
  • ferrous, dior trivalent titanous, cu prous, stannous and the like salts are suitable.
  • organic reducing agents may be used either alone or in mixture with eachother and/or with the -inorganic"- reducing agents described above.
  • Suitable organic reducing'agents are, for instance, alcohols such as methanol, aldehydes, particularlyformaldehyde, ketones, organic acids in. particular of the hydroxy mono or dicarboxylic type such as lactic or succinic acid either in the form of the free acid or a sodium or potassium salt thereof.
  • the anodic oxidation step may be carried out directly in the same bath that is subsequently-used for obtaining the coating metal deposit.
  • the duralumin object' is connected prior to immersion to the positive pole of a DC. source, and concurrently with its immersion in the aforesaid oxidation bath, a current of 14 volts' is caused to pass therethrough at a current density of 1.7 amperes per square decimeter treated surface, during 30' seconds.
  • the object is coated with oxide layer having a thickness of about 0.8 micron.
  • the temperature of the bath during the oxidation step is about 96 C.
  • the object re. mains'in the'same bath during approximately one hour at a temperature of 96 to 98 C. Thereby a desired.
  • nickel coating having: a thickness of about 22 microns is deposited on the anodically oxidized surface of the ob-' ject. The coated object is then rinsed and dried first in air and then:in an oven at '165 C. for one hour.
  • the object is transferred," without rinsing, to an identical bath as described in Example I '(the pH 'value of which has been adjusted to 4.7).
  • Example 1 After rinsing and drying in an oven for about one hour. at 165 C., the coating reveals the same advantageous properties asthe' one obtained in Example 1.
  • Example III Plates'of aluminum of 99.5% purity are' degreased with trichloroethylene, cleaned "duringone minute at'a" temperature of 70 C. in a solution of caustic soda'hav-- ing aconcentration' of g./1., rinsed, and neutralized,
  • the plates are transferred, without rinsing, to a nickel-plating bath similar to that described in Example I.
  • the plates remain in this bath for one hour at a temperature of 96 to 98 0., whereby nickel layers of a thickness of 22 microns and excellent adherence to the base metal are.
  • Example IV The same treatment as described in Example llliis carried out with an oxidation bath containing 10 g./l
  • Example V In the same 'treatment 'as describedin Example 111,
  • a process for coating a metal surface with nickel comprising the steps of (a) degreasing and cleaning the surface in a conventional manner, and (b) subjecting the cleaned surface to electrolytic oxidation in a bath capable of providing an oxidizing environment at the anode, said bath containing at least one compound of nickel and at least one reducing agent being a mineral salt selected from the group consisting of sulfites, thiosulfates, hydrosulfites, arsenites, phosphites, and hypophosphites, and (c) coating the oxidic layer thus formed on said surface in a coating bath with a cover layer of nickel.
  • a process for coating the metal surface of a body consisting of a metal with nickel comprising the steps of (a) connecting said body in an electrolytic circuit, (b) immersing said body surface into an electrolytic bath capable of providing an oxidizing environment at the anode and containing at least one compound of nickel and at least one reducing agent being a mineral salt from the group consisting of sulfites, thiosulfates, hydrosulfites, arsenites, phosphites, and hypophosphites, (c) electrolytically oxidizing said surface by passing current through said circuit, and (d) coating the oxidic layer thus formed on said surface in a coating bath with a cover layer of nickel.
  • a process for coating the metal surface of a body consisting of a metal with nickel comprising the steps of (a) connecting said body in an electrolytic circuit, (b) immersing said body surface into an electrolytic bath capable of providing an oxidizing environment at the anode and containing at least one compound of nickel and at least one reducing agent being a mineral salt from the group consisting of sulfites, thiosulfates, hydrosulfites, arsenites, phosphites, and hypophosphites, (c) electrolytically oxidizing said surface by passing current through said circuit until an oxidic coating is formed on said body surface which coating is less than 20 microns thick, and (d) coating the oxidic layer thus formed on said surface in a coating bath with a cover layer of nickel.
  • a process for coating the metal surface of a body consisting of a metal with nickel comprising the steps of (a) connecting said body in an electrolytic circuit, (b) immersing said body surface into an electrolytic bath capable of providing an oxidizing environment at the anode and containing at least one compound of nickel and at least one reducing agent being a mineral salt from the group consisting of sulfites, thiosulfates, hydrosulfites, arsenites, phosphites, and hypophosphites, (c) electrolytically oxidizing said surface by passing current through said circuit until an oxidic coating is formed on said body surface which coating has a thickness between 0.1 and 10 microns, and (d) coating the oxidic layer thus formed on said surface in a coating bath with a cover layer of nickel.
  • said reducing agent is a salt of a metal in an inferior valency stage below its full valency according to the Periodic Table, selected from the group consisting of the salts of divalent iron, divalent and trivalent titanium, divalent tin, and monovalent copper.
  • a process for plating the metal surface of a body consisting of an easily oxidizable base metal with nickel comprising the steps of successively (a) connecting said body to the anode of the current source of an electrolytic circuit, (b) immersing said metal surface of said body into an aqueous electrolytic bath capable of providing an oxidizing environment at the anode and containing at least one compound of nickel and at least one reducing agent being a mineral salt selected from the group consisting of sulfites, thiosulfates, hydrosulfites, arsenites, phosphites, and hypophosphites, (c) anodically oxidizing said surface by passing current through said circuit so as to deposit an oxidic layer on said surface, and (d) coating the oxidic layer on said surface with a cover layer of nickel.
  • a process for plating the metal surface of a body consisting of an easily oxidizable base metal with nickel comprising the steps of successively (a) connecting said body to the anode of the current source of an electrolytic circuit, (b) immersing said metal surface of said body into an aqueous electrolytic bath capable of providing an oxidizing environment at the anode and containing at least one compound of nickel and at least one reducing agent being a mineral salt selected from the group consisting of sulfites, thiosulfates, hydrosulfites, arsenites, phosphites, and hypophosphites, (c) anodically oxidizing said surface by passing current through said circuit so as to deposit an oxidic layer on said surface, and (d) coating the oxidic layer on said surface in an electrolytic nickel plating bath having a higher pH value than said reducing agent-containing bath with a cover layer of nickel.
  • a process for the preliminary treatment of the surface of a body of a metal selected from the group consisting of aluminum and aluminum alloys, prior to the plating of said surface with nickel comprising the steps of (a) connecting said body to the anode of a current source in an electrolytic circuit, (b) immersing said surface into an aqueous bath capable of providing an oxidizing environment at the anode and containing nickel sulfate, an alkali metal hypophosphite, and at least one salt of an organic acid, (0) electrolytically oxidizing said surface by passing current through said circuit until an oxidic coating is formed on said body surface, which coating has a thickness between 0.1 and 10 microns.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemically Coating (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Electroplating Methods And Accessories (AREA)
US676722A 1956-08-08 1957-08-07 Metal plating process Expired - Lifetime US2965551A (en)

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FR720113 1956-08-08

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US (1) US2965551A (no)
BE (1) BE559886A (no)
CH (1) CH363871A (no)
DE (1) DE1125254B (no)
FR (1) FR1157194A (no)
GB (1) GB870060A (no)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041259A (en) * 1959-07-31 1962-06-26 Hanson Van Winkle Munning Co Cleaning aluminum surfaces
US3178311A (en) * 1961-09-25 1965-04-13 Bunker Ramo Electroless plating process
US3207679A (en) * 1960-05-03 1965-09-21 American Potash & Chem Corp Method for electroplating on titanium
US3219557A (en) * 1962-04-12 1965-11-23 Pacific Scientific Co Method of producing a rotary coupling
US3234110A (en) * 1959-02-06 1966-02-08 Amalgamated Curacao Patents Co Electrode and method of making same
US3282809A (en) * 1962-11-07 1966-11-01 Clevite Corp Iron coating for refractory metal
US3309291A (en) * 1961-07-07 1967-03-14 Lab Dalic Method of electroplating selected portions of an electrically conductive object
US3310430A (en) * 1965-06-30 1967-03-21 Day Company Electroless copper plating
US3340164A (en) * 1963-12-26 1967-09-05 Sperry Rand Corp Method of copper plating anodized aluminum
US3350285A (en) * 1963-07-20 1967-10-31 Ngk Insulators Ltd Method of forming rust-proofing and corrosion-resisting coating on metal surfaces
US3380151A (en) * 1962-02-09 1968-04-30 Oakite Prod Inc Fusion-joining coarse-surfaced high carbon ferrous metals to metals
US3386896A (en) * 1964-11-05 1968-06-04 Bell Telephone Labor Inc Electroplasting onto molybdenum surfaces
US3393134A (en) * 1965-03-23 1968-07-16 Benno A. Schwartz Jr. Method of chromium plating
US3454473A (en) * 1963-12-07 1969-07-08 Matsushita Electric Ind Co Ltd Method for the manufacture of titanium anodic oxidation film capacitors having non-electrolytically plated cathode
US3489657A (en) * 1968-09-30 1970-01-13 Sylvania Electric Prod Process for producing solderable aluminum materials
US3493474A (en) * 1966-04-29 1970-02-03 Gen Motors Corp Aluminum plating process
US3515650A (en) * 1966-06-02 1970-06-02 Toyoda Chuo Kenkyusho Kk Method of electroplating nickel on an aluminum article
US3533918A (en) * 1967-04-18 1970-10-13 John C Smith Method of making electrodes for fuel cells
US3620777A (en) * 1968-07-24 1971-11-16 Hooker Chemical Corp Chromate chemical coating solution for zinc alloy
US3640854A (en) * 1969-12-10 1972-02-08 Mallory & Co Inc P R Continuous forming of metal oxides
US3685582A (en) * 1971-01-14 1972-08-22 Shell Oil Co Electroless metal plating techniques for consolidation of incompetent formations
US4115211A (en) * 1975-12-26 1978-09-19 Nihon Kagaku Sangyo Co., Ltd. Process for metal plating on aluminum and aluminum alloys
US4120760A (en) * 1975-03-20 1978-10-17 Mitsubishi Jukogyo Kabushiki Kaisha Surface treatment of metals
US4293617A (en) * 1979-12-26 1981-10-06 Gould Inc. Process for producing strippable copper on an aluminum carrier and the article so obtained
US4325791A (en) * 1981-01-07 1982-04-20 The United States Of America As Represented By The United States Department Of Energy Method for providing uranium articles with a corrosion resistant anodized coating
US4474651A (en) * 1981-08-20 1984-10-02 Sumitomo Metal Industries, Ltd. Oil well casing and tubing joint and production of same
US4502924A (en) * 1981-09-01 1985-03-05 Nippon Steel Corporation Method for repairing a mold for continuous casting of steel
US5183500A (en) * 1991-04-18 1993-02-02 Kosaku & Co., Ltd. Electroless plating bath composition and method for production thereof
US5298058A (en) * 1991-11-28 1994-03-29 C. Uyemura & Co., Ltd. Electroless copper plating bath
EP1199385A3 (en) * 2000-10-19 2004-02-04 CESCOR S.r.l. Method of coloring titanium and its alloys through anodic oxidation
CN103898582A (zh) * 2013-06-03 2014-07-02 无锡市锡山区鹅湖镇荡口青荡金属制品厂 一种镁合金压铸件表面电镀铬预处理溶液

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FR2091934A1 (en) * 1970-05-15 1971-01-21 Delarue Ets Treatment of magnesium articles - prior to chrome plating
JPS5095139A (no) * 1973-12-27 1975-07-29
DE3124522C2 (de) * 1981-06-23 1983-11-24 Dornier System Gmbh, 7990 Friedrichshafen Verfahren zur stromlosen Einfärbung poröser Materialien
FR2567913B1 (fr) * 1984-07-18 1989-11-10 Commissariat Energie Atomique Procede de preparation de la surface de pieces en uranium ou en alliage a base d'uranium
JPS63140091A (ja) * 1986-12-02 1988-06-11 Kobe Steel Ltd 磁気デイスク用無電解Ｎｉ−Ｐメツキ基盤の耐食性向上方法

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US1947981A (en) * 1930-11-07 1934-02-20 Siemens Ag Plating aluminum
GB515648A (en) * 1937-10-01 1939-12-11 Ig Farbenindustrie Ag Improvements in or relating to a method of producing coatings on magnesium or its alloys
US2231086A (en) * 1936-04-23 1941-02-11 Sherka Chemical Co Inc Method of producing oxide coated aluminum and aluminum base alloys and electrolyte therefor
US2473163A (en) * 1945-06-25 1949-06-14 Ewald H Mccoy Plating nickel on aluminum
US2495941A (en) * 1946-12-18 1950-01-31 Reynolds Metals Co Electroplating copper on aluminum

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DE656663C (de) * 1936-06-19 1938-02-10 Ver Aluminium Werke Akt Ges Verfahren zum elektrolytischen UEberziehen von Aluminium und Aluminiumlegierungen mit Metallen
US2532283A (en) * 1947-05-05 1950-12-05 Brenner Abner Nickel plating by chemical reduction
NL154931B (nl) * 1949-08-08 Philips Nv Stofzuigeraggregaat.
FR1016580A (fr) * 1950-04-21 1952-11-17 Procédé de chromage de l'aluminium ou ses alliages
US2658839A (en) * 1951-04-21 1953-11-10 Gen Am Transport Process of chemical nickel plating
FR1078895A (fr) * 1952-06-24 1954-11-24 Thomson Houston Comp Francaise Procédé de métallisation galvanoplastique de l'aluminium

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
US1947981A (en) * 1930-11-07 1934-02-20 Siemens Ag Plating aluminum
US2231086A (en) * 1936-04-23 1941-02-11 Sherka Chemical Co Inc Method of producing oxide coated aluminum and aluminum base alloys and electrolyte therefor
GB515648A (en) * 1937-10-01 1939-12-11 Ig Farbenindustrie Ag Improvements in or relating to a method of producing coatings on magnesium or its alloys
US2473163A (en) * 1945-06-25 1949-06-14 Ewald H Mccoy Plating nickel on aluminum
US2495941A (en) * 1946-12-18 1950-01-31 Reynolds Metals Co Electroplating copper on aluminum

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234110A (en) * 1959-02-06 1966-02-08 Amalgamated Curacao Patents Co Electrode and method of making same
US3041259A (en) * 1959-07-31 1962-06-26 Hanson Van Winkle Munning Co Cleaning aluminum surfaces
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DE1125254B (de) 1962-03-08
CH363871A (fr) 1962-08-15
FR1157194A (fr) 1958-05-27
GB870060A (en) 1961-06-07
BE559886A (no)

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