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Gold potassium citrate for gold plating and preparation method thereof

A technology of gold potassium citrate and lemon, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve problems such as too wide coverage, achieve convenient safety management, improve stability, and improve gold plating quality Effect

Inactive Publication Date: 2010-07-21
张东山
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the acidic and neutral gold plating process, gold potassium citrate is used to replace potassium aurous cyanide and other citrate gold salts, and at the same time, it solves the problem that the product coverage of gold citrate salt in the gold plating process is too wide. Adding gold potassium citrate to the plating solution supplements gold consumption, and at the same time supplements the consumption of citrate and stabilizes the pH value of the plating solution, thereby improving the stability of the plating solution components, improving the bonding force of the plating layer and the quality of gold plating

Method used

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  • Gold potassium citrate for gold plating and preparation method thereof
  • Gold potassium citrate for gold plating and preparation method thereof
  • Gold potassium citrate for gold plating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0035] Embodiment 1, electroplating thick gold

[0036] main salt type

[0037] It can be seen from the comparison that using gold potassium citrate as the main salt makes it easy to start and refill the tank. During the gold plating process, the composition of the plating solution is stable and the gold plating effect is good.

Embodiment approach 2

[0038] Embodiment 2 Thin gold plating

[0039] main salt type

Potassium aurous cyanide

(68.3% gold content)

Potassium Gold Citrate

(20% gold, PH=5.1)

open cylinder

(per liter)

Potassium aurous cyanide 6g

Diammonium hydrogen citrate 120g

Antimony Potassium Tartrate 0.1g

PH 5.0-5.6

Potassium Gold Citrate 20.5g

* Diammonium hydrogen citrate 109g

Antimony Potassium Tartrate 0.1g

PH 5.0-5.6

Cylinder replenishment

1. Add cyanide for every gram of gold consumed

Potassium aureus 1.46 g (every 30 minutes

make up once)

2. Test citric acid every hour

root and add

3. Adjust the PH value every hour

1. For every gram of gold consumed, add gold citrate

Potassium 5.0 grams (replenish every 30 minutes)

2. Check citric acid every 4 hours

root and add

3. Adjust the PH value every 4 hours

[0040] *The main salt is gold potassium citrate, ...

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Abstract

The invention relates to gold potassium citrate for gold plating and a preparation method thereof. The gold potassium citrate is used to substitute for gold potassium cyanide in acidic and neutral gold plating technology. The problem that the product coverage area is too wide when gold citrate is used in the gold plating technology is solved. The technical scheme is that the gold potassium citrate is the mixed crystal of gold potassium cyanide and citric acid potassium salt and the chemical composition of the gold potassium citrate is KAu (CN)2 (K3C6H5O7. k1C6H8O7) k2, wherein KAu (CN)2 is gold potassium cyanide, K3C6H5O7.k1C6H8O7 is citric acid potassium salt which is mixed by potassium citrate K3C6H5O7 and citric acid C6H8O7, k1 is the molar ratio of potassium citrate to citric acid, is more than or equal to zero and is less than or equal to three, and k2 is the molar ratio of citric acid potassium salt to gold potassium cyanide, is more than or equal to one point three and is less than five. The method is mainly suitable for the acidic and neutral gold plating technology.

Description

technical field [0001] The invention relates to a gold salt used for gold plating, in particular to a gold potassium citrate used for electro-gold plating or chemical gold-plating and a preparation method thereof, which is mainly applicable to acid and neutral gold-plating processes. Background technique [0002] Currently, gold plating is widely used in industry. The gold plating process can be roughly divided into three categories: alkaline cyanide gold plating, sulfite gold plating, acid and neutral gold plating. The most widely used gold plating process is acid and neutral gold plating. Potassium aurous cyanide (chemical formula KAu(CN) is usually used in acidic and neutral gold plating processes 2 , also known as potassium dicyanoaurate, commonly known as gold salt) as the main salt (see "Surface Treatment Technology Encyclopedia" page 290, edited by Liu Yubo, first edition in May 1996). Existing gold plating process quantitatively adds potassium aurous cyanide accord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/48C23C18/42
Inventor 张东山
Owner 张东山
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