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Cyanide-free electroplating baths for white bronze based on copper (I) ions

An electroplating bath and ion technology, applied in the field of cyanide-free electroplating baths, can solve problems such as increasing costs and reducing overall process efficiency

Active Publication Date: 2016-04-06
ROHM & HAAS ELECTRONICS MATERIALS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This extra step reduces the efficiency of the overall process and increases costs, since ultrasonic equipment must be installed or in the case of cathodic degreasing a separate tank with a current supply is required

Method used

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  • Cyanide-free electroplating baths for white bronze based on copper (I) ions
  • Cyanide-free electroplating baths for white bronze based on copper (I) ions
  • Cyanide-free electroplating baths for white bronze based on copper (I) ions

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0050] Copper / tin / silver ternary white bronze

[0051] Prepare the following aqueous acid white bronze plating bath:

[0052] Table 1

[0053] compound

Concentration(g / L)

Copper(I) ion in the form of copper oxide

30

Tin(II) ion in the form of tin methanesulfonate

12

Silver(I) ion in the form of silver methanesulfonate

5

1-(2-Dimethylamino-ethyl)-5-mercapto-1,2,3,4-tetrazole

96

3,6-Dithia-1,8-octanediol

75

Methanesulfonic acid (70%)

150g / L

Antimony in the form of potassium antimony tartrate

0.16

Nonionic Phenol Ethoxylates 1

0.8

hydroquinone monosulfonic acid

1g / L

[0054] 1 Adeka Tol PC-8: Non-ionic surfactant, commercially available from Adeka Corporation.

[0055] The pH of the bath was less than 1 as measured using a KNICK Instruments conventional laboratory pH meter. The molar masses of tetrazole compound, 3,6-dithia-1,8-octanediol and copper(I) ion a...

example 2

[0059] Copper / tin binary white bronze

[0060] Prepare the following aqueous acid white bronze plating bath:

[0061] Table 2

[0062] compound

Concentration(g / L)

Copper(I) ion in the form of copper oxide

14

Tin(II) ion in the form of tin methanesulfonate

8

1-(2-Dimethylamino-ethyl)-5-mercapto-1,2,3,4-tetrazole

42

thiodiethanol

80

hydroquinone monosulfonic acid

1.6g / L

Methanesulfonic acid (70%)

90g / L

bismuth methanesulfonate

0.02

1,10-Phenanthroline Monohydrate

0.01

Nonionic Phenol Ethoxylates 2

0.8

[0063] 2 Adico TolPC-8: non-ionic surfactant, available from Addico.

[0064] The pH of the bath solution is less than 1 as measured with a Konik Instruments routine laboratory pH meter. The molar ratio of tetrazole to copper(I) ions in the bath was 1.1:1, and the molar ratio of tetrazole to thiodiethanol was 0.4:1.

[0065] Use RONACLEAN on a brass panel w...

example 3

[0068] Tetrazole / 3,6-dithia-1,8-octanediol molar ratio in copper / tin / silver electroplating baths

[0069] White bronze copper / tin / silver alloy electroplating baths were prepared as described in Example 1 except that the amount of 3,6-dithia-1,8-octanediol was varied as shown in Table 3 below. The molar ratio of 1-(2-dimethylamino-ethyl)-5-mercapto-1,2,3,4-tetrazole to 3,6-dithia-1,8-octanediol is listed in Table 3 shown.

[0070] Brass panels measuring 10 x 7.5 x 0.025 cm were degreased and activated as described in Example 1 above. Each panel was then placed in a separate Hull cell containing a 250 mL white bronze bath. The pH of the bath is less than 1. Platinized titanium or bronze electrodes are used as anode material. The working bath temperature is in the range of 35°C to 45°C. The panels were electroplated with a white bronze bath at 1A for 3 minutes. All baths appeared to be stable throughout plating.

[0071] After plating, the panels were removed from the Hull...

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Abstract

Copper alloy electroplating baths include one or more sources of copper (I) ions and one or more sources of tin ions to electroplate copper / tin alloys of mirror bright white bronze. The copper alloys may also include one or more sources of silver ions to electroplate ternary alloys of bright white bronze containing copper / tin / silver. The copper alloy electroplating baths are cyanide-free.

Description

technical field [0001] The present invention is directed to cyanide-free electroplating baths for white bronzes based on copper(I) ions. More specifically, the present invention is directed to a cyanide-free electroplating bath for white bronze based on copper(I) ions that is stable and electroplates bright white bronze deposits. Background technique [0002] White bronze is often used as a nickel replacement material in the decorative and sanitary industries. Generally, bronze is 40% to 70% copper by weight, with the remainder being tin or tin and silver or tin and zinc. It is sufficiently hard and provides sufficient wear and corrosion resistance that it can replace nickel in both decorative and hygienic functions. Currently, most industrial white bronzes are not only toxic due to cyanide content, but also have relatively slow plating speeds of 0.1 ASD to about 2 ASD, with low current efficiencies in the range of 50% to 80%. [0003] U.S. 7,780,839 to Egli et al. is a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D3/58
CPCC25D5/10C25D5/12C25D3/58C25D5/627
Inventor A·福伊特J·格拜M·克洛斯
Owner ROHM & HAAS ELECTRONICS MATERIALS LLC
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