Double-tank method for continuously plating thick gold with cyanide-free chemical gold plating solutions

A technology of chemical gold plating and cyanide chemistry, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve the problems of easy contamination of plating solution, chemical gold plating solution containing cyanide, etc., to achieve good bonding force, The appearance is golden yellow, the crystal is fine and dense

Inactive Publication Date: 2013-04-03
XIAMEN UNIV
View PDF13 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a kind of double tank continuous using cyanide-free chemical gold plating solution which can overcome problems such as thin gold layer in the

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Double-tank method for continuously plating thick gold with cyanide-free chemical gold plating solutions
  • Double-tank method for continuously plating thick gold with cyanide-free chemical gold plating solutions
  • Double-tank method for continuously plating thick gold with cyanide-free chemical gold plating solutions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] In the following examples, copper sheets are used as the base material, and the process flow for the application of cyanide-free chemical gold plating solution is: ultrasonic degreasing (50-70°C, time 3-5min) → water washing → pickling (sulfuric acid 30ml / L, 20-40s) →Water washing→Deionized water washing→Displacement gold plating→Water washing→Deionized water washing→Reduction chemical gold plating.

[0046] In the application process of the cyanide-free chemical gold-plating solution in Examples 1-4, the raw materials, conditions and some experimental results adopted for the displacement gold-plating and reduction-type chemical gold-plating are shown in Table 1 and Table 2 respectively.

[0047] Table 1 Preparation of 5L Displacement Gold Plating Solution Meter

[0048]

[0049] Table 2 prepares 5L reduction type gold plating solution meter

[0050]

[0051] The appearance color and crystallization state of the gold coating were evaluated visually, the bonding f...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a cyanide-free chemical method for plating thick gold, particularly a double-tank method for continuously plating thick gold with cyanide-free chemical gold plating solutions. The method comprises the following steps: 1) immersing a substrate in a first cyanide-free chemical gold plating solution, and carrying out replacement gold plating to deposit a thin gold layer, wherein the thickness of the obtained gold film is 0.02-0.08 mu m; and 2) transferring the product obtained in the step 1) into a second cyanide-free chemical gold plating solution, and carrying out reduction-type chemical gold plating to deposit a thick gold layer, wherein the thickness of the obtained gold film is up to 0.3-2 mu m. The gold plating has the advantages of favorable binding force with the substrate, golden appearance and fine and compact crystals. The purity of the gold layer is 100%; and when the gold layer is subjected to welding, no black tray phenomenon is generated. The cyanide-free chemical gold plating solutions have the stability for practical application. The invention can solve the problem of thin gold layer in the replacement gold plating technique, and the problems of high pollution tendency, cyanide containing and the like in the plating solution in the reduction-type chemical gold plating technique.

Description

technical field [0001] The invention relates to a method for cyanide-free chemical thick gold plating, in particular to a double-slot continuous thick gold plating method using a cyanide-free chemical gold plating solution. Background technique [0002] The appearance of the gold coating is golden yellow, with excellent properties such as corrosion resistance, low contact resistance, good solderability, and thermocompression bonding. It can be used as a decorative coating, a protective coating and a functional coating, especially suitable and widely used in the electronics industry Such as surface finishing of printed circuit boards, flexible circuit boards, ceramic integrated circuit packaging, microchip processing, VLSI and advanced equipment devices. Electroless gold plating technology is widely used in partial gold plating and surface gold plating of non-conductive materials such as ceramics, plastics, glass, and silicon semiconductors. [0003] Electroless gold plating...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C23C18/42C23C18/18
Inventor 杨防祖杨丽坤任斌吴德印田中群
Owner XIAMEN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap