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DS-681 Rack Nickel Plating Brightener，

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Company Info.

Wuhan Aobong Surface Technique Co., Ltd.

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Process Characteristics & Advantages

High purity raw material preparation, minimal decomposition products, and good stability of plating solution
The surface quickly becomes bright, with excellent brightness, high and uniform surface flatness, and strong coverage ability in low current density areas
Specialized for hanging plating, clear type, easy to chrome, stable process, and convenient maintenance of plating solution
Suitable for single-layer direct nickel or multi-layer nickel processes with high anti-corrosion performance requirements
Fast brightening, excellent leveling, and high coating fullness.
Good flexibility and high adhesion.
Stable bath, long service cycle, low operating cost.

Plating Solution Formula
Item	Unit	Range
Nickel Sulfate	g/L	200–300
Nickel Chloride	g/L	45–60
Boric Acid	g/L	40–50
High-Speed Nickel Softener	mL/L	5–8
High-Speed Nickel Brightener	mL/L	0.3–0.5
Wetting Agent	mL/L	1–2
Temperature	℃	50–60
pH	-	4.2–4.8
Cathode Current Density	A/dm²	2–6

3. Solution Preparation

Fill a spare tank with half the working volume of water; heat to ~55°C.
Add nickel sulfate and nickel chloride; stir to dissolve completely.
Adjust pH to ~3 with 10% dilute sulfuric acid.
Add 2.5 mL/L 30% hydrogen peroxide; stir 45 min.
Adjust pH to ~5.4 with 4% NaOH; keep at 55°C.
Add 2.5 g/L powdered activated carbon; stir 30 min, stand 4-5 h, filter.
Add boric acid; stir to dissolve.
Add water to full volume; adjust pH to 3.8 with 10% H2SO4
Electrolyze 10 h at 0.2-0.4 A/dm2 with corrugated cathode (uniform color required).
Add brightener, softener, wetting agent; electrolyze 20 min; start trial plating.

4. Solution Maintenance & Notes
Regularly analyze nickel, chloride, and boric acid; keep pH 4.2–4.8, temperature 50–60℃. Add brightener and softener in small, frequent doses. Ratio: Brightener : Softener = 1 : 1.2–1.5. Consumption: Brightener: 80–150 mL/KAH Softener: 100–180 mL/KAH

Note: This manual is based on the company's experiments and data, for reference only.

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