US2128550A - Anticorrosion process for zinc base castings - Google Patents

Anticorrosion process for zinc base castings Download PDF

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US2128550A
US2128550A US655453A US65545333A US2128550A US 2128550 A US2128550 A US 2128550A US 655453 A US655453 A US 655453A US 65545333 A US65545333 A US 65545333A US 2128550 A US2128550 A US 2128550A
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zinc
metal
zinc base
coatings
anticorrosion process
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US655453A
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Jay T Ford
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Motors Liquidation Co
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Motors Liquidation Co
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    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
    • 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
    • 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
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9335—Product by special process
    • Y10S428/934—Electrical process
    • 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
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9335—Product by special process
    • Y10S428/934—Electrical process
    • Y10S428/935—Electroplating
    • 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
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9335—Product by special process
    • Y10S428/936—Chemical deposition, e.g. electroless plating
    • 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
    • Y10T292/00—Closure fasteners
    • Y10T292/82—Knobs
    • 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
    • Y10T428/12583—Component contains compound of adjacent metal
    • 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.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y10T428/12792—Zn-base component
    • 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.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12806—Refractory [Group IVB, VB, or VIB] metal-base component
    • Y10T428/12826—Group VIB metal-base component
    • Y10T428/12847—Cr-base component
    • Y10T428/12854—Next to Co-, Fe-, or Ni-base component
    • 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.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12903—Cu-base component
    • Y10T428/1291—Next to Co-, Cu-, or Ni-base component

Definitions

  • the invention relates to the treatment of'metal surfaces to inhibit or preventcorrosion and is particularly concerned with the treatment of articles composed of alloys having a material con- 5 tent of zinc.
  • Zinc-base alloys for this purpose 0 may contain in the neighborhood of four percent of aluminum and generally magnesium to an amount not over one tenth of one percent, with or without a small content of copper, for example three percent, the remainder being substantially zinc.
  • Such alloys are highly desirable from the standpoint of fluidity, strength and durability for the casting of many small but relatively complicated parts, such as parts of automobile fittings, coach hardware, etc.
  • Electra-deposited coatings are normally somewhat porous and corrosive agencies apparently 0 obtain access to the base metal through the pores of the coating. At any rate, the products of corrosion exude through the electro-plated coating and appear as unsightly spots of white deposit on the surface.
  • concentrations of the salts employed and of the acid may be varied within widelimits.
  • a bath which has been found satisfactory com-' prises about 100 grams of sodium or potassium.
  • 56 cles should be rinsed thoroughly and then dried in air.
  • the rinsing may be in ordinary tap water atroom temperature.
  • the treatmentdescribed produces on the surface a very thin film which has high corrosionresisting properties and serves toprotect the base 4 metal from attack by atmospheric or like agencies. It also acts toinhibit or prevent intercrystalline corrosion. If the treatment has been applied directly to the base metal, the articles thus treated may be employed without further coatings for uses where decoration orother additional surface finishes are not required. If, however, electrodeposited or like finishes are desired they may be applied after the treatment descri, or the articles may be subjected to the anti-corrosion treatment after the other coatings have been applied.
  • a door handle which is cast of a zinc-base alloy of the general character above referred to.
  • the handle is coated with successive layers of copper, nickel and chromium, all of which may be applied in the usual manner from electrolytic baths of standard composition.
  • electro-deposited metal coatings such as copper-nickel-chromium coatings referred to above, chromium being preferable for the outer portion at least of such metal coating, may be applied by the methods commonly used for electro-plating.

Description

Aug. 30, 1938s J, T ORD 2,128,550
ANTICORROSION PROCESS FOR ZINC BASE CASTINGS Filed Feb. 6-, 1933 ZINC BASE ALLOY COPPIR menu.
Patented Aug. 30, 1938 UNITED STATES PATENT OFFICE 2.128.550 i I AI'lTICORBOSlON PROCESS FOR. ZINC BASE CASTING I Jay T. Ford, Flint, Mich, assignor, by mesne assignments, to General Motors Corporation, -Detroit, Mich., a corporation of Delaware Application February 6, 1933; Serial No. 655,453
Claims. (Cl. mid-l3) The invention relates to the treatment of'metal surfaces to inhibit or preventcorrosion and is particularly concerned with the treatment of articles composed of alloys having a material con- 5 tent of zinc.
Alloys of this type, generally termed zincbase alloys, are of especial importance in the manufacture of articles by the method knownas die-casting." Zinc-base alloys for this purpose 0 may contain in the neighborhood of four percent of aluminum and generally magnesium to an amount not over one tenth of one percent, with or without a small content of copper, for example three percent, the remainder being substantially zinc. Such alloys are highly desirable from the standpoint of fluidity, strength and durability for the casting of many small but relatively complicated parts, such as parts of automobile fittings, coach hardware, etc. I
One material defect that has been encountered in castings from. zinc-base alloys is their tendency to corrode when exposed to atmospheric or other corrosive agencies. Even the usual metal coatings, such as the copper-nickel-chromium 25 coatings now in general use, are ineffective to prevent attack on the zinc unless great care is taken and unusually heavy coatings applied.
Electra-deposited coatings are normally somewhat porous and corrosive agencies apparently 0 obtain access to the base metal through the pores of the coating. At any rate, the products of corrosion exude through the electro-plated coating and appear as unsightly spots of white deposit on the surface.
I have found that the corrosion of zinc and zinc-base alloys upon exposure to weathering agencies, salt-spray tests, and the like, may be substantially prevented by a chemical treatment of the surfaces which may be appliedeither be- 40 fore or after the application of electrolytic deposits. This chemical treatment comprisessubjecting the surfaces to the action of an acid bath containing a dichromate, preferably of sodium or potassium. I
The concentrations of the salts employed and of the acid may be varied within widelimits. A bath which has been found satisfactory com-' prises about 100 grams of sodium or potassium.
56 cles should be rinsed thoroughly and then dried in air. The rinsing may be in ordinary tap water atroom temperature.
The treatmentdescribed produces on the surface a very thin film which has high corrosionresisting properties and serves toprotect the base 4 metal from attack by atmospheric or like agencies. It also acts toinhibit or prevent intercrystalline corrosion. If the treatment has been applied directly to the base metal, the articles thus treated may be employed without further coatings for uses where decoration orother additional surface finishes are not required. If, however, electrodeposited or like finishes are desired they may be applied after the treatment descri, or the articles may be subjected to the anti-corrosion treatment after the other coatings have been applied.
In the accompanying drawing is shown asan example of the articles to which the invention may be applied, a door handle which is cast of a zinc-base alloy of the general character above referred to. As illustrated, the handle is coated with successive layers of copper, nickel and chromium, all of which may be applied in the usual manner from electrolytic baths of standard composition.
The electro-deposited metal coatings such as copper-nickel-chromium coatings referred to above, chromium being preferable for the outer portion at least of such metal coating, may be applied by the methods commonly used for electro-plating.
I claim: v
l. 'The method of treating articles composed largely of zinc to prevent corrosion of the surface comprising applying to the surface of the article a'combination of coatings, one produced by immersion in' an acidified dichromate solution and one consisting of electro-deposited metal.
2. The method as set-forth in claim 1, the treatment with dichromate solution being applied to the surface subsequent to the deposition of metal thereon.
3. The method as set forth in claim 1, the metal coating consisting of successively deposited layers, the outer one of which is chromium.
4. An article having a relatively large content of zinc and coated with a thin film of the reaction product of an acidified solution of dichromate acting upon the zinc, the surface being also coated with electro-deposlted metal. I
5. An article as set forth in claim 4. the outer portion at least of said metal coating being of chromium.
JAY '1. FORD.
US655453A 1933-02-06 1933-02-06 Anticorrosion process for zinc base castings Expired - Lifetime US2128550A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491837A (en) * 1948-08-31 1949-12-20 Gen Electric Manufacture of ice
US2768133A (en) * 1951-08-04 1956-10-23 Lundbye Axel Plastic articles and method of making same
US2796361A (en) * 1953-04-15 1957-06-18 Poor & Co Method of making corrosion protected articles
US2894885A (en) * 1945-01-06 1959-07-14 Allen G Gray Method of applying copper coatings to uranium
US3247082A (en) * 1962-08-07 1966-04-19 Harshaw Chem Corp Electrodeposition of a corrosion resistant coating
US3282659A (en) * 1965-08-24 1966-11-01 Westinghouse Electric Corp Plated zinc base articles and method of making
US3345145A (en) * 1963-03-05 1967-10-03 Philips Corp Auxiliary member of a composite foil for joining two objects of different coefficients of thermal expansion
US3505178A (en) * 1967-05-12 1970-04-07 Engelhard Ind Inc Process of electroplating an article by sequentially passing the same and a platinum coated tungsten anode through a series of different electroplating baths
US3664933A (en) * 1969-06-19 1972-05-23 Udylite Corp Process for acid copper plating of zinc
US4273837A (en) * 1975-04-18 1981-06-16 Stauffer Chemical Company Plated metal article
US5700044A (en) * 1996-09-11 1997-12-23 Wartian; George Door latch operator

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2894885A (en) * 1945-01-06 1959-07-14 Allen G Gray Method of applying copper coatings to uranium
US2491837A (en) * 1948-08-31 1949-12-20 Gen Electric Manufacture of ice
US2768133A (en) * 1951-08-04 1956-10-23 Lundbye Axel Plastic articles and method of making same
US2796361A (en) * 1953-04-15 1957-06-18 Poor & Co Method of making corrosion protected articles
US3247082A (en) * 1962-08-07 1966-04-19 Harshaw Chem Corp Electrodeposition of a corrosion resistant coating
US3345145A (en) * 1963-03-05 1967-10-03 Philips Corp Auxiliary member of a composite foil for joining two objects of different coefficients of thermal expansion
US3282659A (en) * 1965-08-24 1966-11-01 Westinghouse Electric Corp Plated zinc base articles and method of making
US3505178A (en) * 1967-05-12 1970-04-07 Engelhard Ind Inc Process of electroplating an article by sequentially passing the same and a platinum coated tungsten anode through a series of different electroplating baths
US3664933A (en) * 1969-06-19 1972-05-23 Udylite Corp Process for acid copper plating of zinc
US4273837A (en) * 1975-04-18 1981-06-16 Stauffer Chemical Company Plated metal article
US5700044A (en) * 1996-09-11 1997-12-23 Wartian; George Door latch operator

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