Cyanide-free gold nickel alloy plating electroplate liquid

Abstract

The invention provides a cyanide-free gold nickel alloy plating electroplate liquid and a plurality of additives applicable for the nickel alloy plating system. The cyanide-free gold nickel alloy plating electroplate liquid comprises the following components: 3-5g / L of organic salt of gold, 30-50g / L of inorganic salt of nickel, 30-120g / L of a coordination agent citric acid or citric acid salt thereof, 1-10g / L of supporting electrolyte, 0-100g / L of a pH regulator and gold nickel alloy plating additive system. The operation conditions of the cyanide-free gold nickel alloy plating electroplate liquid are as follows: the pH is 4-5, the current density is 1A / dm to 5A / dm<2>, and the temperature is 30-50 DEG C. The cyanide-free gold nickel alloy plating electroplate liquid has the following advantages of low toxicity or non toxicity, good stability, low replacement rate with nickel, copper and other metal substrates. The bonding power of the plating layer is favorable and the plating layer is bright, so the electroplate liquid is applicable for decorative electroplate, functional electroplate and other fields.

Description

technical field

[0001] The invention relates to a gold-plated nickel alloy solution, in particular to a cyanide-free electroplating solution for a gold-plated nickel alloy containing gold salt and a cyanide-free compound. Background technique

[0002] The gold-nickel alloy coating has strong corrosion resistance and good anti-tarnish ability. At the same time, the gold-nickel alloy coating has a variety of colors, so it is widely used in plating jewelry, watch parts, artworks, etc. So far, gold-plated nickel alloys at home and abroad mainly use cyanide-plated gold-nickel alloys. This is because the cyanide-plated gold-nickel alloy liquid has good chemical stability, good dispersion and depth capabilities, and good coating brightness. However, cyanide gold plating is highly toxic and harmful to humans and the environment. Good ventilation equipment and wastewater treatment conditions are required during production. Therefore, countries around the world have introduced corres...

Examples

Embodiment 1

[0021] When using the following cyanide-free gold-plated nickel alloy electroplating solution for electroplating, select the copper electrode as the cathode and the carbon plate as the anode. Adjust the temperature to a predetermined value at a current density of 1A / dm 2 ~5A / dm 2 Under plating.

[0022] The composition of the gold-plated nickel alloy electroplating solution is as follows:

[0023]

[0024] According to the electroplating step in the specific embodiment, the electroplating operation is performed using the cyanide-free gold-plated nickel alloy electroplating solution. Results The copper electrode was plated with gold-nickel alloy, and the weight percentage of gold was 95.83% (23K gold) through analysis and test.

Embodiment 2

[0026] When using the following cyanide-free gold-plated nickel alloy electroplating solution for electroplating, select the copper electrode as the cathode and the carbon plate as the anode. Adjust the temperature to a predetermined value at a current density of 1A / dm 2 ~5A / dm 2 Under plating.

[0027] The composition of the gold-plated nickel alloy electroplating solution is as follows:

[0028]

[0029] According to the electroplating step in the specific embodiment, the electroplating operation is performed using the cyanide-free gold-plated nickel alloy electroplating solution. Results The copper electrode was plated with gold-nickel alloy, and the weight percentage of gold was 95.83% (23K gold) through analysis and test.

Embodiment 3

[0031] When using the following cyanide-free gold-plated nickel alloy electroplating solution for electroplating, select the copper electrode as the cathode and the carbon plate as the anode. Adjust the temperature to a predetermined value at a current density of 1A / dm 2 ~5A / dm 2 Under plating.

[0032] The composition of the gold-plated nickel alloy electroplating solution is as follows:

[0033]

[0034] According to the electroplating step in the specific embodiment, the electroplating operation is performed using the cyanide-free gold-plated nickel alloy electroplating solution. Results The copper electrode was plated with gold-nickel alloy, and the weight percentage of gold was 95.83% (23K gold) through analysis and test.

technical field

[0001] The invention relates to a gold-plated nickel alloy solution, in particular to a cyanide-free electroplating solution for a gold-plated nickel alloy containing gold salt and a cyanide-free compound. Background technique

[0002] The gold-nickel alloy coating has strong corrosion resistance and good anti-tarnish ability. At the same time, the gold-nickel alloy coating has a variety of colors, so it is widely used in plating jewelry, watch parts, artworks, etc. So far, gold-plated nickel alloys at home and abroad mainly use cyanide-plated gold-nickel alloys. This is because the cyanide-plated gold-nickel alloy liquid has good chemical stability, good dispersion and depth capabilities, and good coating brightness. However, cyanide gold plating is highly toxic and harmful to humans and the environment. Good ventilation equipment and wastewater treatment conditions are required during production. Therefore, countries around the world have introduced corres...

Examples

Embodiment 1

[0021] When using the following cyanide-free gold-plated nickel alloy electroplating solution for electroplating, select the copper electrode as the cathode and the carbon plate as the anode. Adjust the temperature to a predetermined value at a current density of 1A / dm 2 ~5A / dm 2 Under plating.

[0022] The composition of the gold-plated nickel alloy electroplating solution is as follows:

[0023]

[0024] According to the electroplating step in the specific embodiment, the electroplating operation is performed using the cyanide-free gold-plated nickel alloy electroplating solution. Results The copper electrode was plated with gold-nickel alloy, and the weight percentage of gold was 95.83% (23K gold) through analysis and test.

Embodiment 2

[0026] When using the following cyanide-free gold-plated nickel alloy electroplating solution for electroplating, select the copper electrode as the cathode and the carbon plate as the anode. Adjust the temperature to a predetermined value at a current density of 1A / dm 2 ~5A / dm 2 Under plating.

[0027] The composition of the gold-plated nickel alloy electroplating solution is as follows:

[0028]

[0029] According to the electroplating step in the specific embodiment, the electroplating operation is performed using the cyanide-free gold-plated nickel alloy electroplating solution. Results The copper electrode was plated with gold-nickel alloy, and the weight percentage of gold was 95.83% (23K gold) through analysis and test.

Embodiment 3

[0031] When using the following cyanide-free gold-plated nickel alloy electroplating solution for electroplating, select the copper electrode as the cathode and the carbon plate as the anode. Adjust the temperature to a predetermined value at a current density of 1A / dm 2 ~5A / dm 2 Under plating.

[0032] The composition of the gold-plated nickel alloy electroplating solution is as follows:

[0033]

[0034] According to the electroplating step in the specific embodiment, the electroplating operation is performed using the cyanide-free gold-plated nickel alloy electroplating solution. Results The copper electrode was plated with gold-nickel alloy, and the weight percentage of gold was 95.83% (23K gold) through analysis and test.

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