Nickel cobalt boron ternary alloys

a ternary alloy and cobalt technology, applied in the field of ternary alloys, can solve the problems of restricted use of chromium (vi) and its compounds in certain applications, and achieve the effects of increasing the bright plating range, and facilitating deposition of metal ions

Inactive Publication Date: 2005-08-11
TASKEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] The present invention provides nickel, cobalt, and boron ternary alloys that have a mirror bright deposit and a hardness on par with chrome. The desirable characteristics of the ternary alloys made in accordance with the present invention are, at least in part, attributable to the use of certain brighteners in the electroplating bath. The brighteners facilitate deposition of metal ions on the cathode in such a manner as to result in electroplated nickel cobalt boron ternary alloys having numerous desirable properties. For example, the brighteners facilitate deposition of metal ions at relatively low current densities, thereby increasing the bright plating range. Consequently, the nickel cobalt boron ternary alloys may take the place of electroplated chrome and chromium alloys, thereby providing potential environmental benefits.

Problems solved by technology

However, the use of chromium (VI) and its compounds are restricted in certain applications in some areas, primarily in the European Union.

Method used

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  • Nickel cobalt boron ternary alloys
  • Nickel cobalt boron ternary alloys
  • Nickel cobalt boron ternary alloys

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0071] The electroplating bath of Comparative Example 1 is prepared except that 0.05 g / L of sodium laurel sulfate as a surfactant, 2.25 g / L of sodium saccharin as a stress reliever, 0.01 g / L of 2-butyne-1,4-diol and 0.01 g / L of propargyl alcohol as brighteners, and 0.10 g / L of 1-(sulfopropyl)pyridinium hydroxide as a leveler are added.

[0072] A metal deposit is produced from the electroplating bath with a surfactant, a stress reducing agent, and brighteners using 2 amp DC current in a mechanically agitated 267 ml Hull cell to determine plate response over a wide plating current density. The electroplating bath using a standard make up requires 6.2 Volts to achieve 2 amps. Plating time is 5 minutes. The type / appearance of the metal plate is shown in FIG. 4. A mirror bright deposit is obtained over at a wide range of current densities as low as about 4 ASF and higher.

example 2

[0073] The electroplating bath of Comparative Example 1 is prepared except that 0.1 g / L of sodium 2-ethylhexyl sulfate as a surfactant, 1 g / L of bisbenzenesulfonimide as a stress reliever, 0.01 g / L of 2-butyne-1,4-diol and 0.02 g / L of propargyl alcohol as brighteners, and 0.08 g / L of (1-sulfo-2-hydroxypropyl)pyridinium hydroxide as a leveler are added.

[0074] A metal deposit is produced from the electroplating bath with a surfactant, a stress reducing agent, and brighteners using 2 amp DC current in a mechanically agitated 267 ml Hull cell to determine plate response over a wide plating current density. Plating time is 5 minutes. The type / appearance of the metal plate is shown in FIG. 4. A mirror bright deposit is obtained over at a wide range of current densities as low as about 4 ASF and higher.

example 3

[0075] The electroplating bath of Example 1 is prepared except that a 100 g / L of sodium sulfate decahydrate is added via the make up. Voltage is lowered to 5 Volts to achieve 2 amps without impacting the type / appearance of the metal plate.

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Abstract

Disclosed are methods of electroplating a nickel cobalt boron alloy involving providing an electroplating bath comprising ionic nickel, ionic cobalt, ionic boron, and at least one brightener; and applying a current to the electroplating bath whereby a nickel cobalt boron alloy forms.

Description

FIELD OF THE INVENTION [0001] The present invention generally relates to ternary alloys containing nickel, cobalt, and boron that may be employed in place of chrome and chrome alloys and methods of making the ternary alloys. BACKGROUND OF THE INVENTION [0002] Chromium is steel-gray, lustrous, hard, metallic, and takes a high polish. Chromium is a naturally occurring element present in the environment in several different forms. The most common forms are chromium (0), chromium (III), and chromium (VI). The metal chromium, which is the chromium (0) form, is used for making steel. Chromium (VI) and chromium (III) are often used for chrome plating. Chromium (VI) is used as an anti-corrosion treatment and as an electrical shielding material for certain sheet metals. There are many desirable characteristics associated with chromium plating. [0003] However, the use of chromium (VI) and its compounds are restricted in certain applications in some areas, primarily in the European Union. Broa...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25D3/56C25D5/18
CPCC25D5/18C25D3/562C25D5/611C25D5/623C25D5/627
Inventor BOKISA, GEORGEECKLES, WILLIAM E.FRISCHAUF, ROBERT E.
Owner TASKEM
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