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Method for producing environment-friendly lead-free electroless nickel immersion gold

A lead-free chemical nickel-gold, production method technology, applied in the field of chemistry, can solve problems such as unenvironmental protection, and achieve the effects of reducing consumption, reducing cylinder dragging time, and inhibiting reaction

Inactive Publication Date: 2013-01-16
湖南领湃科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the existing production method is not environmentally friendly, the present invention adopts a production method of environment-friendly lead-free chemical nickel gold

Method used

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Embodiment Construction

[0026] An environment-friendly production method of lead-free chemical nickel gold provided by the invention, the method firstly etches the circuit board and the circuit board processed by solder resist ink, and then undergoes pre-treatments such as grinding or sandblasting; then the circuit board is The plate was treated at 50°C with 10% KOZO 801 for 5 minutes; then washed with tap water, sent to 27°C with 100 grams per liter of sodium persulfate and 20 ml per liter of concentrated sulfuric acid. Etching tank for 2 minutes; then wash with deionized water, enter the pre-dipping tank configured with 0.5% concentrated sulfuric acid at room temperature for 1 minute; then directly enter the activation tank configured with 8% KOZO 804 at 27°C for 1 minute . Finally, rinse with deionized water and enter the chemical nickel treatment at 80°C for 20 minutes. Wherein, chemical nickel bath solution composition adopts following formula to realize:

[0027] nickel sulfate 23-...

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Abstract

The invention provides a method for producing environment-friendly lead-free electroless nickel immersion gold. The method comprises the following steps of: etching a line, and treating a circuit board by using solder mask ink; performing pretreatment, namely polishing and brushing or blasting sand; placing the circuit board in an oil removal trough and treating for 5 minutes; washing by using tap water and conveying into a microetching trough for 2 minutes; washing by using deionized water, and feeding into a preimpregnation trough for 1 minute; directly feeding into an activation trough and treating for 1 minute; washing by using the deionized water, and treating in chemical nickel at the temperature of 80 DEG C for 20 minutes; and washing by using the deionized water, and treating in immersion gold which is prepared from 10 percent KOZO 806 and citric acid gold with density of 2g / L. By the method, the technical problem that the conventional production method is not environment-friendly can be solved; lead in the chemical nickel is replaced and is totally environment-friendly; and the condition that tin is not soldered well can be avoided. The toxic potassium aurous cyanide in the immersion gold is replaced, and the immersion gold is totally environment-friendly; and a solution is stable and is prevented from being decomposed.

Description

technical field [0001] The invention relates to the chemical field, in particular to an environment-friendly production method of lead-free chemical nickel-gold. Background technique [0002] The existing nickel-gold production method is to replace a small amount of palladium on the copper surface of the circuit, so that the circuit uses palladium as the catalytic core to deposit a layer of 4 with a phosphorus content of about 7-10% in the chemical nickel tank by means of redox. A micron-thick nickel-phosphorus alloy layer (phosphorus is a by-product of the chemical nickel reaction eutectic in the nickel layer), on which a 0.07-micron gold layer is replaced by a replacement method. Electroless nickel gold is a powerful surface treatment in circuit boards. It can be used in electronic products such as mobile phone keypads, computer memory sticks, etc. It can be used as welding parts and current conduction contacts at the same time. But in fact it is a process that is not env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/32C23C18/18C23C18/30C23C18/42
Inventor 周诗敏刘红霞蔡志华牛艳丽罗迎花黄超玉
Owner 湖南领湃科技股份有限公司
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