Non-cyanide silver plating bath composition

Inactive Publication Date: 2005-08-25
TECHNIC INC
View PDF5 Cites 42 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] Accordingly, it is an object of this invention to provide a non-cyanide plating solution for the deposition of silver, said solution being capable of yielding mi

Problems solved by technology

Succinimide undergoes hydrolysis at pH values above neutrality, which in turn causes the pH of the plating solution, no

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Sufficient water was used to form one liter of a solution containing the following:

Potassium hydroxide  60 gramsSulfamic Acid52.5 grams5,5-dimethylhydantoin  60 gramsSilver as complex with  25 grams Ag5,5-dimethylhydantoin2,2′-dipyridyl 0.8 grams

[0021] The solution pH was approximately 11.0. A test panel was plated from this solution in a Hull cell at 0.5 ampere for 5 minutes at room temperature with moving-vane agitation. The deposit obtained was white and mirror-bright at indicated current densities from about 5-20 mA / cm2.

example 2

[0022] Sufficient water was used to form one liter of a solution containing the following:

Potassium hydroxide  60 gramsSulfamic Acid52.5 grams5,5-dimethylhydantoin  60 gramsSilver as complex with  25 grams Ag5,5-dimethylhydantoin2,2′-dipyridyl0.40 gramsNicotinamide 4.0 grams

[0023] The solution pH was approximately 11.0. A test panel was plated from this solution in a Hull cell at 0.5 ampere for 5 minutes at room temperature with moving-vane agitation. The deposit obtained was white and mirror-bright at indicated current densities from near zero to about 12.5 mA / cm .

example 3

[0024] A plating solution was made up as in Example 2, but additionally containing approximately 0.6 grams of Rhodacal N in the form of an aqueous solution. A test panel was plated from this solution in a Hull cell at 0.5 ampere for 5 minutes at room temperature with moving-vane agitation. The deposit obtained was brilliant mirror-bright white at current densities from near zero to greater that 20 mA / cm2.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Surfaceaaaaaaaaaa
Brightnessaaaaaaaaaa
Login to view more

Abstract

Disclosed is an electroplating solution for the deposition of silver; said solution containing silver in the form of a complex of silver with hydantoin or a substituted hydantoin compound; said solution also containing an excess of the hydantoin or substituted hydantoin compound employed, together with an effective quantity of a nonprecipitating electrolyte salt, and also an effective quantity of 2,2′ dipyridyl for the purpose of obtaining a mirror-bright to brilliant deposit.

Description

BACKGROUND OF THE INVENTION [0001] Numerous non-cyanide silver plating processes have been attempted (1). Of these, the only ones to have achieved commercial success have been those employing succinimide, either as a premanufactured silver complex (2, 3), or as a reagent. Succinimide undergoes hydrolysis at pH values above neutrality, which in turn causes the pH of the plating solution, normally in the range of 8 to 9 or so, to become unstable; and also to require frequent replenishment of the succinimide. [0002] Hydantoin (CAS Number 461-72-3) is a cyclic diimide possessing structural features similar to succinimide, and similarly effective as a complexing agent for silver. A series of substituted hydantoins exist, of which the most commonly available commercially is 5,5-dimethylhydantoin (CAS No. 77-71-4). As a class, the hydantoins are soluble in moderate-to-strongly alkaline (pH ≧8) solutions, are capable of forming complexes with silver and other metals, and are more resistant ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C23C16/00C25D3/46
CPCC25D3/46
Inventor MORRISSEY, RONALD J.
Owner TECHNIC INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap