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Copper-tin electrolyte and method for depositing bronze layers

A technology of electrolyte and bronze alloy, which is applied in the field of copper-tin-electrolyte, and can solve problems such as limited long-term stability

Inactive Publication Date: 2010-01-06
UMICORE GALVANOTECHN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Electrolytes based on pyrophosphate generally have very limited long-term stability and must be frequently refreshed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] For the deposition of yellow bronze layers by wheel plating a non-toxic electrolyte according to the invention was used which contained 120 g / L hydroxyethyl-amino-bis(methylene-phosphonic acid) HEMPA in water, 2 g / L copper in copper sulphate, 6g / L tin in tin sulfate and 0.1g / L low molecular weight polyethyleneimine. The pH of the electrolyte is 11.

[0034] During the entire deposition process, the electrolyte was tempered at 60 °C. At 0.1-0.2A / dm 2 A uniformly glossy bronze layer with a yellow tint typical for bronze is obtained in a wheel plating apparatus at an adjusted current density of .

Embodiment 2

[0036] For the production of yellow bronze layers in a device in which the substrate constituting the cathode is fixed on a support, a non-toxic electrolyte according to the invention is used, which contains 100 g / L of ethylenediamine-tetrakis(methylenephosphonic acid) dissolved in water ) EDTMP, copper in 4g / L copper pyrophosphate, tin in 5g / L tin pyrophosphate and zinc in 3g / L zinc pyrophosphate. The plating bath also contained 15 g / L methanesulfonic acid as a stabilizer. The pH of the plating bath was 8.

[0037] At 0.5-1A / dm 2 A glossy, blemish-free bronze layer with a yellow tint was obtained at an adjusted current density of 50° C. and a tempering of the electrolyte at 50° C.

Embodiment 3

[0039] To deposit the white bronze layer an electrolyte was used which contained 50 g / L ethylenediamine-tetrakis(methylenephosphonic acid) EDTMP and 50 g / L 1-hydroxyethane-(1,1-di-phosphonic acid) HEDP in aqueous solution . Copper in 0.5 g / L copper sulfate, tin in 4.0 g / L tin sulfate and zinc in 2 g / L zinc sulfate were present as metals to be deposited. The pH value of the non-toxic electrolyte solution according to the present invention is 10. At a plating bath temperature of 50°C and 0.1-0.2A / dm 2 A mechanically stable and beautiful white bronze layer is obtained by the wheel plating method and the rack plating method at a current density of 100%.

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PUM

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Abstract

Consumer goods and technical objects are galvanically coated with bronze layers for decorative reasons and for protection against corrosion. The electrolytes used until now to generate decorative bronze layers either contain cyanide or, in the case of baths based on organosulfonic acid, are highly corrosive, or in the case of cyanide-free baths based on diphosphoric acid, exhibit insufficient long-term stability. Most electrolytes used to apply solderable bronze layers in the electronics industry contain toxic or very toxic thio compounds. The present invention provides a non-toxic electrolyte that is stable in the long term for galvanically depositing decorative bronze layers, and a corresponding method for applying said decorative bronze layers on consumer goods and technical objects.

Description

technical field [0001] The invention relates to copper-tin electrolytes which do not contain toxic components such as cyanide or sulfur compounds. The invention also relates to a method for depositing a decorative bronze layer on household and industrial products using the electrolyte solution according to the invention. Background technique [0002] Commodities or articles of daily use, as defined in the Articles of Commodity Regulations, are finished with thin oxidation-stable metal layers for decorative reasons and to prevent corrosion. These layers must be mechanically stable and should not show temper color or signs of wear over longer periods of use. Since 2001, the sale of household articles coated with nickel-containing wrought alloys is no longer permitted or only possible under strict conditions in Europe in accordance with EU Directive 94 / 27 / EC, due to contact allergies involving nickel and nickel-containing metal layers Original. Bronze alloys in particular ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/58
CPCC25D3/58
Inventor K·布龙德尔B·维姆勒F·欧博司特S·伯格M·劳斯特
Owner UMICORE GALVANOTECHN
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