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Manufacturing method of low free chlorine gold salt

A manufacturing method and low ionization technology, applied in the direction of gold organic compounds, etc., can solve the problems of difficult mass production, poor gold plating characteristics, etc., and achieve the effects of less localized corrosion, improved risk, and good solder wetting characteristics

Inactive Publication Date: 2014-03-26
KOJIMA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] But, use the gold electroplating solution of above-mentioned gold potassium citrate, because gold electroplating property is poorer than conventional potassium aurous cyanide, or it is difficult to manufacture in large quantities, can not satisfy

Method used

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  • Manufacturing method of low free chlorine gold salt
  • Manufacturing method of low free chlorine gold salt
  • Manufacturing method of low free chlorine gold salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Dissolve half of 100.0g of potassium aurous cyanide in 500ml of 12.5% ​​citrate solution, and adjust the liquid temperature to 80°C while stirring, then add half of 46.1g of tripotassium citrate and 15.0g of lemon Half of the acid was stirred to dissolve.

[0040] Then, a small amount of 90 ml of 30% hydrogen peroxide was slowly added to this solution while bubbling carbon monoxide. While confirming the reaction status, add the remaining potassium aurous cyanide, tripotassium citrate, and citric acid. While keeping carbon monoxide bubbling and continuing, the temperature of the reaction solution was kept at 50° C., and the pH value was kept at 5.6-6.0, while aging for three hours.

[0041] Furthermore, the remaining hydrogen peroxide was slowly added to the reaction solution. After adding the hydrogen peroxide, the temperature of the reaction solution was kept at 80°C, and the pH value was kept at 5.6-6.0, so that the carbon monoxide bubbles continued for five hours, ...

Embodiment 2

[0046] Dissolve about half of 50.0 g of potassium aurous cyanide in 300 ml of 10% citrate solution, adjust the liquid temperature to 80°C while stirring, then add half of 23.0 g of tripotassium citrate, citric acid 7.5 g half, stirring to dissolve.

[0047] Then, in the solution, carbon monoxide and ozone gas generated by the ozone generating device were started to bubble. While confirming the reaction status, the remaining potassium aurous cyanide, tripotassium citrate, and citric acid were added. While making the bubbling of carbon monoxide and ozone gas continue, the temperature of the reaction solution was kept at 50° C., and the pH value was kept at 5.6-6.0, while aging for eighteen hours.

[0048] Furthermore, the temperature of the reaction solution was kept at 80°C, and the pH value was kept at 5.6-6.0, so that the carbon monoxide and ozone gas bubbles were kept for five hours, so that the reaction solution was concentrated.

[0049] The concentrated reaction solutio...

reference example 1

[0059] Acidic degreasing was performed on the displacement type electroless gold plating test substrate using a commercially available electroless gold plating process (manufactured by Uemura Kogyo Co., Ltd.) etching acid soak endow palladium catalyst After electroless nickel plating, use the low free cyanide gold salt replacement gold electroplating solution obtained in Example 1 to form an electroless gold (about 0.05 μm) / nickel film (about 5 μm) on the copper electrode.

[0060] Displacement-type electroless gold plating is to add 1.8L of pure water to a beaker, mix 0.2L of commercially available displacement-type electroless gold plating chemicals (trade name: TKK-51 product of Uemura Industrial Co., Ltd.), and then add to Example 1 The obtained low free cyanogen gold salt is used to build a displacement type electroless gold electroplating solution. The basic operating conditions of the gold electroplating solution are that the gold concentration is set at 1.0 g / L,...

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Abstract

The invention relates to a manufacturing method of low free chlorine gold salt. Potassium aurous cyanide, tripotassium citrate anhydrous and citric acid are dissolved in pure water at the temperature below 80 DEG C, oxidant is added in the solution while carbon monoxide is foamed, reaction solution is concentrated and cooled and crystal separated out therefrom is the low free chlorine gold salt represented by the general formula (1) which is of good solubility. When the low free chlorine gold salt is used for gold electroplating solution, an envelope with less free chlorine in an electroplating bath and excellent electroplating performance can be obtained. The low free chlorine gold salt can maintain low chlorine concentration, low partial corrosion of nickel and excellent welding flux characteristics when being used as gold salt for gold plating. The general formula (1) is shown in the specification.

Description

technical field [0001] The present invention relates to a method for producing a low-free gold cyanide salt, and in particular to a method for producing a low-free gold cyanide salt useful as a gold salt for gold plating. Background technique [0002] In the past, NaAu(CN) was generally used as a gold salt for gold plating. 2 (Sodium aurous cyanide), NaAu(CN) 4 (sodium gold cyanide), KAu(CN) 2 (Potassium aurous cyanide), KAu(CN) 4 (potassium gold cyanide), and NH 4 Au(CN) 2 Gold cyanide salt or ammonium gold cyanide salt of an alkali metal such as (ammonium aurous cyanide). [0003] Among the above-mentioned gold cyanide salts, due to solubility, potassium aurous cyanide is mostly used as a gold plating solution. [0004] When potassium aurous cyanide is used to prepare the gold-plating electroplating solution, since a small amount of potassium cyanide remains in the crystal, the gold electroplating bath contains free cyanide. Also, when potassium aurous cyanide itsel...

Claims

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Application Information

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IPC IPC(8): C07F1/12C25D3/48
Inventor 入波平龍一渡辺秀人
Owner KOJIMA CHEM CO LTD
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