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Production method of deplating liquid for concentrated gold coating

A production method and technology for stripping solution, applied in the field of chemistry, can solve problems such as operator personal injury, unqualified coating, environmental pollution, etc., and achieve the effects of stable product properties, low cost and convenient storage.

Inactive Publication Date: 2011-04-20
ZHONGSHAN FLASHLIGHT POLYTECHNIC
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  • Abstract
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Problems solved by technology

[0003] In the process of electroplating gold, unqualified plating often occurs, especially printed circuit boards, resulting in many gold-plated waste products. For the recovery of gold in these waste products, the traditional method of deplating gold plating is to use aqua regia to dissolve, but As a result, unprecedented and irreversible environmental pollution has been caused, and at the same time, it has caused serious personal injury to the operator.

Method used

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with specific examples.

[0016] The production method of concentrated gold plating stripping solution is prepared by adding 100-150g of nitro compound, 0.05-0.12g of inorganic catalyst, 30-50g of KOH, 12-20g of D-potassium gluconate and 25-50g of potassium citrate per liter of water. Deplating solution.

[0017] The nitro compound is selected p-nitrobenzoate. The inorganic catalyst is ferric compound such as ferric nitrate or ferric sulfate or ferric chloride.

[0018] The method for preparing the gold-removing working solution by applying the above-mentioned concentrated gold plating stripping solution is as follows: Take the preparation of 10 liters of gold-removing working solution as an example: dissolve 350-400 grams of KCN (or NaCN) in 7 liters of water; then add 1 liter of concentrated Continue to dilute the gold plating stripping solution to 10 liters with water to form a gold stri...

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Abstract

The invention relates to a production method of deplating liquid for concentrated gold coating, which is characterized by adding 100 to 150g of nitro compound, 0.05 to 0.12g of inorganic catalyst, 30 to 50g of KOH, 12 to 20g of D-potassium gluconate and 25 to 50g of potassium citrate into 1 liter of water to prepare the deplating liquid. The deplating liquid prepared according to the method of the invention is free from toxicity and harm, causes small environmental pollution, and can decoat the gold coating fast and efficiently.

Description

technical field [0001] The invention belongs to the chemical field, in particular to a production method of a gold plating deplating solution. Background technique [0002] So far, in surface treatment technology, electroplating is still a traditional process that cannot be replaced by many advanced technologies, especially some gold electroplating with special requirements is used in precision instruments, printed circuit boards, integrated circuits, tube shells, electrical contacts, etc. has a wide range of applications. According to its process characteristics, gold plating has two kinds of gold plating without cyanide and gold plating with cyanide. At present, the quality of gold plating is preferably cyanide gold plating, and its color, adhesion, and wear resistance are better than cyanide-free gold plating. Generally speaking, the coating of homogeneous gold plating does not need to be plated too thickly, as long as it reaches 2 microns. The coating of heterogeneous...

Claims

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Application Information

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IPC IPC(8): C23F1/14
Inventor 陈静静范义春
Owner ZHONGSHAN FLASHLIGHT POLYTECHNIC
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