Novel cyanide-free alkaline copper plating solution and preparation method thereof

A cyanide-free alkaline copper plating and coating technology, applied in the field of electroplating solution, can solve problems such as hidden safety hazards, the problem of bonding force between the coating and the steel substrate, and the problem of solution stability, and achieve good bonding force, good coverage and stability. Good results

Inactive Publication Date: 2015-12-16
HUZHOU FANGMING ENVIRONMENT PROTECTION TECHCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The copper plating layer obtained by the cyanide copper plating process has fine crystals and small porosity, but the cyanide copper plating process contains highly toxic CN?, and there are huge safety hazards in the entire process control and maintenance process. Therefore, there is no need for research and development. Cyanide copper plating process has become the general trend
So far, cyanide-free copper plating mainly includes pyrophosphate series, sulfate series, citric acid series, HEDP serie

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A novel cyanide-free alkaline copper plating solution, which consists of the following components:

[0034] 1. Sodium citrate: 120g / L

[0035] 2. Copper sulfate: 30g / L

[0036] 3. Potassium sodium tartrate: 35g / L

[0037] 4. Sodium bicarbonate: 6g / L

[0038] 5. Cyanide salt: 30g / L

[0039] 6. Brightener: 3ml / L

[0040] 7. Tea saponin: 0.5 / L.

[0041] The working condition of described cyanide-free alkaline copper plating solution is:

[0042] pH: 8.5-9.5

[0043] Temperature: 35-45°C

[0044] DK: 0.5-1.5A / cm2 (current density).

[0045] The preparation method of described cyanide-free alkaline copper plating solution is:

[0046] Step 1. Adjust the pH value of 1 to 4 and dilute with water;

[0047] Step 2. Dissolve 2 into 1. Since 1 is easily saturated in water, strong stirring is required to completely dissolve 2 into 1;

[0048] Step 3, adding 3 to the liquid in step 2;

[0049] Step 4. Dissolve 4 and 7 into the liquid of step 3 together, and adjust the pH...

Embodiment 2

[0054] A novel cyanide-free alkaline copper plating solution, which consists of the following components:

[0055] 1. Sodium citrate: 180g / L

[0056] 2. Copper sulfate: 30g / L

[0057] 3. Potassium sodium tartrate: 35g / L

[0058] 4. Sodium bicarbonate: 10g / L

[0059] 5. Cyanide salt: 40g / L

[0060] 6. Brightener: 3ml / L

[0061] 7. Tea saponin: 0.5 / L.

[0062] The working condition of described cyanide-free alkaline copper plating solution is:

[0063] pH: 8.5-9.5

[0064] Temperature: 35-45°C

[0065] DK: 0.5-1.5A / cm2 (current density).

[0066] The preparation method of described cyanide-free alkaline copper plating solution is:

[0067] Step 1. Adjust the pH value of 1 to 4 and dilute with water;

[0068] Step 2. Dissolve 2 into 1. Since 1 is easily saturated in water, strong stirring is required to completely dissolve 2 into 1;

[0069] Step 3, adding 3 to the liquid in step 2;

[0070] Step 4. Dissolve 4 and 7 into the liquid of step 3 together, and adjust the p...

Embodiment 3

[0075] A novel cyanide-free alkaline copper plating solution, which consists of the following components:

[0076] 1. Sodium citrate: 120g / L

[0077] 2. Copper sulfate: 20g / L

[0078] 3. Potassium sodium tartrate: 25-g / L

[0079] 4. Sodium bicarbonate: 6g / L

[0080] 5. Cyanide salt: 40g / L

[0081] 6. Brightener: 1ml / L

[0082] 7. Tea saponin: 0.8 / L.

[0083] The working condition of described cyanide-free alkaline copper plating solution is:

[0084] pH: 8.5-9.5

[0085] Temperature: 35-45°C

[0086] DK: 0.5-1.5A / cm2 (current density).

[0087] The preparation method of described cyanide-free alkaline copper plating solution is:

[0088] Step 1. Adjust the pH value of 1 to 4 and dilute with water;

[0089] Step 2. Dissolve 2 into 1. Since 1 is easily saturated in water, strong stirring is required to completely dissolve 2 into 1;

[0090] Step 3, adding 3 to the liquid in step 2;

[0091] Step 4. Dissolve 4 and 7 into the liquid of step 3 together, and adjust the pH ...

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PUM

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Abstract

The invention discloses a novel cyanide-free alkaline copper plating solution which comprises the following components: 120-180 g/L of sodium citrate, 20-30 g/L of copper sulfate, 25-35 g/L of sodium potassium tartrate tetrahydrate, 6-10 g/L of sodium bicarbonate, 30-40 g/L of cyani salt, 1-3 ml/L of a brightener and 0.5-0.9/L of tea saponin. The novel cyanide-free alkaline copper plating solution, disclosed by the invention, has the following advantages: the stability is excellent, the clad layer crystal is delicate, the covering power is excellent, the current range is wide, a semi-bright clad layer is excellent in binding force, the clad layer with the thickness of more than 10 microns can be plated, and traditional toxic cyaniding copper plating can be replaced.

Description

technical field [0001] The invention relates to a cyanide-free alkaline copper plating solution and a preparation method thereof, belonging to the field of electroplating solutions. Background technique [0002] Copper has good electrical conductivity, thermal conductivity and ductility, but the chemical stability of copper is poor. Generally, it is only used as the middle layer or bottom layer of other coatings to improve the bonding force between the coating and the base metal. If it needs to be used alone as a decoration When plating, it must be coated with an organic coating on its surface or after coloring treatment and then coated with an organic coating. [0003] The copper plating process is divided into two categories: cyanide copper plating process and cyanide-free copper plating process. The copper plating layer obtained by the cyanide copper plating process has fine crystals and small porosity, but the cyanide copper plating process contains highly toxic CN?, an...

Claims

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Application Information

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IPC IPC(8): C25D3/38
Inventor 徐卫民干方明
Owner HUZHOU FANGMING ENVIRONMENT PROTECTION TECHCO LTD
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