Galvanic nickel or nickel alloy electroplating bath for depositing a semi-bright nickel or nickel alloy

a nickel or nickel alloy and electroplating bath technology, applied in the field of galvanic nickel or nickel alloy electroplating bath, can solve the problems of reducing the leveling obtained, reducing fatigue strength, and reducing the formation of harmful breakdown or degradation products at a high rate, and achieving good leveling , good glance properties, and low internal stress

Active Publication Date: 2016-02-25
ATOTECH DEUT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patented method is improved look quality and reduced internal stress for coated materials. Additionally, it improves stability over time by providing better balance between brightness and smooth appearance.

Problems solved by technology

This patent describes different methods for producing both semi-bright and chrome-metal coatings. While traditional techniques like immersion nickel plating and semi-bright nickel plating provide technical benefits, there may still exist issues related to achieving consistently high levels of brightness and smooth surface quality. There is a need for improved compositions that can maintain stable performance over a long period of time without causing decomposition reactions or negative impacts on the underlying layers.

Method used

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Embodiment Construction

[0037]As used herein, the term “galvanic nickel or nickel alloy electroplating bath”, when applied for depositing a semi-bright nickel or nickel alloy coating in accordance with the present invention, refers to a galvanic nickel bath, which is based on the so-called “Watts electrolytic bath”, which has the general following composition:

240-550 g / lnickel sulfate (NiSO4•7H2O or NiSO4•6H2O), 30-150 g / lnickel chloride (NiCl2•6H2O), and 30-55 g / lboric acid (H3BO3).

[0038]The large amount of nickel sulfate provides the necessary concentration of nickel ions, while nickel chloride improves anode corrosion and increases conductivity. Boric acid is used as a weak buffer to maintain the pH value.

[0039]In the present invention, the galvanic nickel and nickel alloy electroplating baths have chloride content ranging from 10 to 50 g / l, preferably ranging from 15 to 40 g / l, and more preferably ranging from 20 to 30 g / l.

[0040]Nickel chloride may be replaced partly or entirely by sodium chlo

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Abstract

The present invention is related to a galvanic nickel or nickel alloy electroplating bath for depositing a semi-bright nickel or nickel alloy coating characterized in that the electroplating bath comprises at least one compound having the general formula (I)
  • wherein R1=C1-C18 hydrocarbon moiety substituted with a SO3− group, C1-C18 hydrocarbon moiety substituted with a carboxylic group or C1-C18 hydrocarbon moiety substituted with at least an aromatic and/or a heteroaromatic group;
  • R2=NR3R4 moiety, OR5 moiety, or cyclic NR6 moiety, wherein
  • R3, R4, R5=hydrogen or C1-C18 hydrocarbon moiety or C1-C18 hydrocarbon moiety substituted with at least an aromatic and/or a heteroaromatic group, wherein R3, R4 and R5 are identical or different;
  • R6=C3-C8 hydrocarbon moiety or C3-C8 hydrocarbon moiety, wherein at least one carbon atom is substituted by a heteroatom; and
  • n=1-3.

Description

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Claims

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Application Information

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Owner ATOTECH DEUT GMBH
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