Palladium plating solution

A technology of plating solution and palladium salt, applied in the field of palladium plating solution, can solve problems such as expensive, cracking, and impractical use of the plating solution

Inactive Publication Date: 2003-05-28
KOJIMA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned plating method has the following disadvantages: the rhodium plating solution cannot be practically used because it is very expensive
However, even with this conventional surface treatment technique, the problem of cracking due to internal stress in thick palladium deposits or under practical conditions to maintain surface gloss cannot be satisfactorily resolved
[0005] Recently, the shapes of various decorative materials produced by palladium baths are quite complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Bath composition

[0039] Dichlorodiamine palladium 10g / l (calculated as Pd)

[0040] Tellurous acid 0.05g / l (calculated as Te)

[0041] Ammonium chloride 80g / l

[0042] Ammonium hydrogen phosphate 20g / l

[0043] Niacinamide 0.8g / l

[0044] Sodium di-2-ethylhexyl sulfosuccinate 0.01g / l

[0045] Adjust the pH of the plating solution to 8.3 with ammonia water, and immerse a pre-nickel-plated brass plate with a size of 25×35mm in the plating solution for 30 minutes at a temperature of 45°C and a current density of 1.0A / dm 2 . As a result, a glossy palladium plating film with an average thickness of 7 µm was prepared. When this palladium plating film was subjected to an ammonia exposure test (12 hours at room temperature), no cracks were observed.

Embodiment 2

[0047] Bath composition

[0048] Dichlorodiamine palladium 10g / l (calculated as Pd)

[0049] Ammonium chloride 90g / l

[0050] Boric acid 10g / l

[0051] Niacinamide 1.0g / l

[0052] 2,6-Pyridinedicarboxylic acid 0.5g / l

[0053] Lauryltrimethylammonium Chloride 0.1g / l

[0054] Adjust the pH of the plating solution to 8.3 with ammonia water, and immerse a pre-nickel-plated brass plate with a size of 25×35mm in the plating solution for 30 minutes at a temperature of 42°C and a current density of 1.0A / dm 2 . As a result, a glossy palladium plating film with an average thickness of 7 µm was produced. When this palladium plating film was subjected to an ammonia exposure test (12 hours at room temperature), no cracks were observed.

Embodiment 3

[0056] Bath composition

[0057] Dichlorodiamine palladium 10g / l (calculated as Pd)

[0058] Ferrous ammonium sulfate 0.1g / l (calculated as Fe)

[0059] Ammonium chloride 90g / l

[0060] Boric acid 10g / l

[0061] Niacinamide 1.0g / l

[0062] 2,6-Pyridinedicarboxylic acid 0.5g / l

[0063] Lauryltrimethylammonium Chloride 0.1g / l

[0064] Adjust the pH of the plating solution to 8.3 with ammonia water, and immerse a pre-nickel-plated brass plate with a size of 25×35mm in the plating solution for 30 minutes at a temperature of 42°C and a current density of 1.0A / dm 2 . As a result, a glossy palladium plating film with an average thickness of 7 µm was prepared. When this palladium plating film was subjected to an ammonia exposure test (12 hours at room temperature), no cracks were observed.

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PUM

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Abstract

A palladium plating solution, characterized in that it comprises a soluble palladium salt in an amount of 0.1 to 40.0 g/liter in terms of palladium, 0.01 to 10 g/liter of a pyridine-carboxylic acid and/or at least one selected from among a soluble iron salt, zinc salt, thalium salt and tellurium salt and the like in an amount of 0.002 to 1.0 g/liter in terms of metal, 0.005 to 10 g/liter of amine derivative of pyridine-carboxylic acid, an aldehydobenzoic acid derivative, and 0.001 to 1.2 g/liter of an anionic surfactant or an amphoteric surfactant. The palladium plating solution allows the preparation of a highly pure and stable palladium precipitate which is excellent in specular gloss, forms a plating film having a thickness of 5 um or more and is free from the occurrence of a crack.

Description

technical field [0001] The present invention relates to a palladium plating bath, and more particularly to a palladium bath suitable for providing palladium-plated decorative materials in which the problem of nickel allergies associated with the decorative materials is addressed. Background technique [0002] Palladium plating baths have been studied extensively since a long time ago. The deposit obtained by plating has excellent physical properties, such as light fastness, corrosion resistance, discoloration resistance, wear resistance and so on. Therefore, the palladium plating solution has been used in a wide range of fields, such as decorative materials, electrical contacts of electronic components, connectors, circuit boards and the like. For white plating of personal ornaments such as watch cases, watch straps, eye holders, necklaces, earrings and rings with conventional surface treatment techniques, palladium plating solutions, palladium-nickel alloy plating solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/50C25D3/52C25D3/56
CPCC25D3/52C25D3/56C25D3/567
Inventor 秋元武海新井阳太郎
Owner KOJIMA CHEM CO LTD
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