Black (Black Pearl) Electroplating Additive

This process can produce a uniquely elegant electroplated finish on bright nickel or bright copper coatings, delivering distinctive decorative effects and finding widespread application in light‑industry products such as timepieces, lighting fixtures, and leather‑trim components.

Category:

Alloy Plating

Phone:

13971436457

Email:

384580672@qq.com

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Detailed description:

01

02

This process yields a relatively dark finish and incorporates a blackening agent, allowing the coating’s shade to be adjusted according to customer requirements to achieve an elegant black‑pearl tone.

03

The coating exhibits high hardness, excellent wear resistance, and stable processing.

04

It can be used for both hanging plating and barrel plating.

Process formulation and operating procedures

Potassium pyrophosphate (K4P2O7)		200~250 g/L
Gun-black electroplated A-salt		25~30 g/L
Gun-black electroplated B-grade		30~40 ml/L
Gun black stabilizer		1~2 g/L
Temperature		40~45℃
pH		Electroplating: 8.5–9.5
		Barrel plating 9.5~10
Anode		Graphite
Denmark		0.1~2 A/dm²
Cathode movement		Need

Common Fault Troubleshooting	Possible causes	Handling method
The color is on the lighter side.	1. Temperature too low	1. Heating
	2. A salt is too low	2. Supplement
	3. Insufficient lighting on the lower floor	3. Increase the base brightness
Uneven coloration with a narrow brightening range.	1. Potassium pyrophosphate is insufficient	1. Supplement
	2. Insufficient B agent	2. Supplement

	3. Insufficient stabilizer	3. Supplement
	4. Too low pH value	4. Adjust with potassium hydroxide solution.
Striped	1. Insufficient stabilizer	1. Supplement
	2. Influence of Metallic Impurities	2. Low-current electrolysis
	3 B doses are insufficient.	3 Supplement