DE1521457A1 - Application of a nickel-cobalt alloy to an aluminum base - Google Patents

Description

152U57

Sperry Hand Corporation The Sperry Band Building 1290 Avenue of the Americas New York 19, N.T., USA

Applying a nickel-fused alloy to a Aluminum base

The invention relates to the application of a nickel-cobalt alloy on aluminum substrates, and in particular that Plating or coating of aluminum work pieces with a magnetic alloy film made of nickel-cobalt. In the invention, the term aluminum is pure aluminum, the commercially available aluminum with the Usual impurities, alloys with aluminum baeia and The aluminum alloys understood, in which the aluminum is the main and distinctive component . the alloy 1st.

Aluminum storage devices or units, the aluminum * £ J miniuasoheiben, drums and the like. Have on their a magnetic metal film was applied to the surface,

_ω are widely used. Sets The production of these storage devices from aluminum is advantageous, since aluminum - "is relatively cheap, can be easily processed, and is available almost everywhere and is available in small quantities.

BATH ORIGINAL

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However, aluminum is an active metal and it is therefore difficult to plate another metal on the aluminum using conventional flattening techniques. Heretofore, it has been extremely difficult to apply a magnetic film or coating, e.g. B _9, a magnetic film made of a nickel-cobalt alloy, to be applied to an aluminum base.

This invention relates to a method, one on a magnetic film composed of a metal alloy to a To apply aluminum underlay.

Another object of the invention is a method of making a magnetic film made of a metal alloy by electroless application to an aluminum support to plate.

Another object of the invention is a method, one consisting of the nickel-cobalt magnet alloy PlIa directly by electroless application of a aqueous solution containing Niekel cobalt to a To apply aluminum underlay

Furthermore, an object of the invention is the finishing of aluminum workpieces with a magnetic film made of nickel-cobalt alloy.

Vie accomplishes these and other objects of the invention can be found in the following Besehreilraag in connection with the attached drawing, in who climbed a flowchart in a schematic way which corresponds to an embodiment of the invention.

Haeh's invention has now been discovered; that a Viekel-Kbbalt-iila can thus be effectively applied to an aluminum base by adding the aluminum base .old overflowed a ßchutischitht made of zinc whereupon the aluiaium-

'908831 / 11.9 * ~ ³ ~

ORIGINAL

pad ait containing an aqueous nickel-cobalt Solution is brought into contact, this being a solution Composition has, whereby, «in immediately · β application the nickel-cobalt alloy is effected on the aluminum base. Here the zinc overxug of the aluminum base dissolved on the same side in the solution mentioned, so that an immediate application the nickel-cobalt alloy comes about on the aluminum base.

In the drawing, the workflow according to the invention is shown by a block diagram. An aluminum pad or an aluminum workpiece that is finished with a the coating is to be applied to remove oil, grease, dirt and other grease on the surface any impurities are cleaned. The cleaned workpiece is then processed in order to make the adhesive surface To remove aluminum oxide, which forms very quickly on aluminum when it is mixed with an oxygen-containing ^ Environment is in contact. As indicated, the film formed on the surface may be aluminum oxide can be effectively eliminated by removing the aluminum workpiece is immersed in a nitric acid bath.

After removing the aluminum oxide surface the aluminum base or the workpiece made of aluminum is immersed in a zinc-electrolytic bath, x. Am an aqueous solution of an alkali zincate, for an • electroless application of a protective layer made of zinc effect on the aluminum. The zinc layer serves to protect the aluminum base from oxidation before applying the nickel-cobalt film. Upon need the used zinc plating bath can »awaken restoration or for the recovery of parts, e.g. B · Zinc parts, can be recycled.

After the zinc plating process, the jetet is «in · Aluminum workpiece with a protective layer made of zinc in a nickel-cobalt-containing plating

9 09831/1133

BATH ORIGINAL

152U57

bath dipped in such a way that the Zinc protective layer removed from the Aluainiuaunterlage, dissolved in the bath and on the same side Nickel-cobalt alloy film or coating is applied to the aluminum base. After the electroless Flattierungsvorgangeβ the Aluminum base, which is now coated with a magnetic Niokel-Cobalt alloy, taken from the bath « If necessary, the Nlekel-Cobalt bath can be used again Recycling can be renewed or metal parts can be recovered.

z-

According to the invention, the aluminum workpiece to be obtained carefully cleaned to remove all oil, grease, dirt or the like from the surface * Bas cleaning can be done by solvent washing with water in a bath and / or by applying a wet steam jet stream It is desirable that the removal of contaminants be performed on the aluminum workpiece The process used should not chemically attack the aluminum workpiece itself.

After the cleaning process, the adhesive surface film or the aluminum oxide layer is removed by known methods removed, e.g. B. by nitric acid bath, which is preferably followed by a water rinse. Bach dem Removing the aluminum oxide layer becomes the aluminum workpiece immersed in an aqueous zinc plating bath. This process usually requires an immersion dee Aluminum work piece during a tent breakdown sound ea. 0.25 - 3 minutes at room temperature in an aqueous Solution of alkali zincate, which is about 100 Grams of zinc oxide and about 4oo grams of caustic soda pve liter of the bath, the best being essentially Water is. Bas Alkali-Met al 1-ZinkatT-Bad can be used in «a Composition and concentration vary widely will. The amount of zinc oxide can be less than 1oo Graj * per liter, however, the ratio of caustic soda to zinc oxide is usually within the range

909831/1133

BATH ORIGINAL

152H57

Ratio * 3 (1 to β> 1. Sti Allcali-ltetall-aiakat bath can also be made from equivalent quantities tos cinnamon or other alkali solutions are prepared · I let it be desired that the bath small amounts το »at least * an iron-Xooalt- and Hiokel-hydroside occur. Sa « Presence of such an additional connection · »promotes a uniform, served and adhesive 2jjücao storage on the surface of the aluminum workpiece · fite Presence toa additional copper salsa provides further Pie parts

I am an alkali metal zincate bath with the following approval in grams per liter can be used «

ZnO IaOH

IeCl, · 6H ₂ O-1

C / AiP "6 --— 5

Another alkali-metal-zinc-catalyst bath can have the following composition according to the invention)

Water - 1 liter Caustic soda - 4ο

- 8th· "

Copper in the form of Potassium Xupfer Cyanide - 2 "

latrium sulfite - 25 "

The bath also has the effect of removing any aluminum oxide film that may be left behind.

After immersion in the bath, the aluminum workpiece becomes removed and rinsed with water to remove any zincate solution that may still be adhering the aluminum workpiece with one made of zinc Protective layer overspray. Then it becomes so exaggerated Workpiece in an aqueous electroless Hickel cobalt plating solution immersed to thus an essentially

-6-

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SAD

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dissolving of the stoking zinc in the same direction Aohicht and the deposit "ineβ magnetic film * do one Hlokel cobalt layer directly on the surface cause the aluminum work piece su. Here, dia Hiokel-Iobalt alloy on the aluminum bar surface level the white zinc layer applied.

Bin alaktroloaaa Plattierungebad that custody for dia application eineβ from Hickel cobalt beetehendea magnetic films is, via iet follows susammengestallt t

CoCl ₂ · 6 BgO - 6o-35 g / l

HiOl ₂ . 6 H ₂ O - 2-25 "

Seignette-Salx (Kalum-Hatrium- Tartrate) - 2oo "

HaH ₂ PO ₂ .H ₂ O - 2ο ".

It is desirable that the constituent of hypophosphite ions in the Hickel cobalt flattening bath be in the range of about 11 to 13 grams per liter when the bath is about 60 grams of CoCl ₀ · _{6H 3} O per liter and about 2 grams of HlCl ₂ · 6 H ₂ O per liter, the above-mentioned constituents remaining unchanged, a Nlokel cobalt fila is applied to the aluminum workpiece, which in its composition has about 90 % cobalt, 7 % Hiokel and 3 % phosphorus by weight. When the nickel-xobalt plating bath has about 35 grams of CoCl ₂ # 6 H ₂ O and about 25 grams of HlCl ₂ . 8 H ₂ O contains, ao a magnetic film is applied, the following composition according to weight onweiati about 40% cobalt, 56 % Hickel and M-% phosphorus.

The compositions of the Hickel cobalt flattening baths according to the invention are described in copending application Ho. 146,953 filed on October 31, 1961 at to the name of Ernest W. Jones, who is also considered a co-inventor of the present invention. The teaching of the listed patent application is used here and is considered to be for the benefit of the invention.

909831/1133 BAD GRiG ^ AL ~ ⁷ ~

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Because «electroless plating with a magnetic layer Nickel-cobalt on an aluminum workpiece can be used at any temperature, which is τοη room temperature extend to 18o ° F or beyond as appropriate can, and be carried out during a tent breakdown, sufficient to make one made of Hiokel-Cobalt existing alloy layer of the desired thickness on the To apply aluminum workpiece, d. H. generally 1 to 10 minutes.

After immersion in the nickel-cobalt electroless plating bath the workpiece is taught in, washed and is then ready for further processing. The spent Hickel-Cobalt plating bath is on retained in order to recover τοη metal parts including nickel, cobalt and zinc.

Obviously, many changes can be made to those skilled in the art and rearrangement of the description set forth above come within the scope of the invention without to deviate from the aim of the invention "

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Claims (1)

• H2U5T- Claims 1. Method of depositing a film of nickel-cobalt alloy on an aluminum base, characterized in that a zinc layer is applied to the aluminum base is applied and this so processed base with an aqueous,. Nickel and cobalt-containing solution is brought into contact, which has a composition has) that a nickel-cobalt alloy are applied directly to the aluminum base can, with the Einkschicht on the same side of the aluminum base peeled off and dissolved in the solution in order to apply the nickel-cobalt alloy immediately to effect on the aluminum base 2. The method according to claim 1, characterized in that that a zinc layer is applied to the aluminum base from a water-containing alkali metal zincate solution will.. 3. The method according to claim 2, characterized in that that the alkali metal zincate solution of zinc oxide and Sodium hydroxide solution is produced, with the weight ratio never the caustic soda to zinc oxide is in the range of 3 t 1 to 8: 1. 4. The method according to claim 1, characterized in that that the coating solution containing nickel and cobalt has the following composition: CoCl ₂ . 6 H ₂ O • -60-35 HiCl ₂ . 6 H ₂ O - 2-25 " Seignette-Sali - 2ee " HH ₄ Cl \ 5 " HaH ₂ PO ₂ . H ₂ O ~ 2 " -2-909831 / 1133 BATH ORIGINAL 3 152U57 5. The method according to claim 1, characterized in that the zinc layer consists of a water-containing alkali Metal zincate solution applied to the aluminum base gene, the hating solution containing nickel and cobalt has the following composition: CoCl ₂ . 6 H ₂ O - 6o-35 g / l HiCl ₂ , 6 H ₂ O - 2-25 ^w Seignette SalB - 2oo " - 5o ^M - 2o ⁿ 6. Method of applying a film also more magnetic Hiekel cobalt alloy directly on the surface of an aluminum workpiece, characterized in that the impurities on the surface and the adhesive layer of aluminum oxide from the aluminum workpiece be removed, that then on the -from the aluminum oxide layer substantially freed workpiece a zinc layer is applied on its surface, so that the coated workpiece with a water-containing Nickel-cobalt flatting solution comes into contact, this plating solution having a composition through which the nickel-cobalt alloy can be applied directly to the workpiece surface and whereby the zinc layer is released from the workpiece at the same time, so that the Hickel-cobalt alloy is deposited is effected directly on the surface of the aluminum workpiece. 7 «Method according to claim 6, characterized in that that the zinc layer consists of a water-containing alkali metal zincate solution is applied to the surface of the aluminum workpiece. 8. The method according to claim 7t, characterized in that the Aliali-Hetall-Zinlcatlösung is made from zinc oxide and sodium hydroxide solution, the weight ratio of the sodium hydroxide solution to the zinc oxide in the range of 3 * 1 bl "approx. 8: 1. 909831/1133 "*** BATH ORIGINAL Ϊ521457 9. The method according to claim 6, characterized in that that the plating solution containing nickel and cobalt has the following composition: CoCl ₂ . 6 H ₂ O 60-35 β / 1 NiCl ₂ . 6 H ₂ O 2-25 n Seignette salt (potassium Sodium tar tr at; 2oo η NH ₄ Cl 5o η NaHpPO ₂ . H ₂ O 2o η 60-35 egg 2-25 It 2oo η 5o ft 2o π 1o «method according to claim 6, thereby germinated« lehnet, that the plating solution containing nickel and cobalt has the following composition: CoCl ₂ · _{6H 2} O
NiCl ₂ . 6 H ₂ O Seignette salt (potassium sodium tartrate) NH ₄ Cl
NaH ₂ PO ₂ . H ₂ O and that the zinc layer consists of a water-containing alkali metal zincate solution applied to the surface of the aluminum workpiece. 11. Aluminum workpiece, characterized by a nickel-cobalt coating according to claim 1. 12 · Aluminum workpiece, identified by a Nickel-cobalt coating according to claim 6. 909831/113 * ORIGINAL BATHROOM -