R·G-728 Liquid Trivalent Black Passivation For Electroplated Zinc Nickel Alloy Coatings
R·G-728 is a liquid trivalent chromium black passivation process completely free of hexavalent chromium, specially developed for electroplated zinc-nickel alloy coatings. Specific gravity: d=1.26±0.03.
Compatible with both barrel plating and rack plating processes.
| Item | Working Range |
|---|---|
| R·G-728 Zinc-Nickel Trivalent Black Passivation Concentrate | 70–90 mL/L |
| pH Value | 1.5–2.0 |
| Operating Temperature | 22–30 ℃ |
| Immersion Time | 70–120 seconds |
| Minimum Zinc-Nickel Alloy Coating Thickness | 8 μm |
| Agitation Mode | Mechanical agitation |
- Zinc-nickel alloy workpieces
- automotive chassis parts
- aerospace fasteners
- electronic precision parts
- new energy hardware
- industrial mechanical components
- anti-corrosion metal parts
- black decorative hardware
- outdoor metal fittings
- high-precision structural parts
R·G-728 is a professional trivalent black passivation solution for zinc-nickel alloy plating. It forms uniform, glossy black passivation films with outstanding anti-corrosion performance. It suits high-standard industrial metal parts needing black decoration and long-term rust resistance, widely used in automotive, electronics, new energy and aerospace fields.
Q1: What are the core features of R·G-728 passivation?
A1: It delivers uniform pure black film without color difference, features trivalent chromium environmental protection, and greatly boosts zinc-nickel alloy corrosion resistance. The film has strong adhesion, stable texture, no fading, and adapts to mass industrial production.
Q2: What workpieces is R·G-728 suitable for?
A2: It is specially applicable to all zinc-nickel alloy plated workpieces, including automotive chassis hardware, new energy equipment parts, electronic precision fasteners and aerospace light-duty structural metal components.
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