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ZINC-NICKEL PLATING WITH TRIVALENT CHROMIUM PASSIVATION APPLICABLE ON FERROUS ALLOYS. PROVIDES CORROSION PROTECTION AND INCREASED HARDNESS WHILE MAINTAINING GOOD DUCTILITY.
- Trivalent Chromium Passivation (RoHS Compliant)
- It produces a self-healing conversion layer
- It provides a hard, semi-bright gray, and durable film
- Passivation layer is suitable for subsequent sealant application
- Exceptional corrosion resistance: over 900 hours in NSS with red salts without sealant
Benefits of Zn-Ni Coatings
Zinc-nickel alloy coatings (typically ~85% zinc and ~15% nickel) are deposited on carbon steel as protective layers in a process similar to standard zinc plating.
Zn-Ni coatings typically consist of:
- A base layer of 8–14 μm
- A trivalent passivation layer of 0.06–0.15 μm
- A sealant layer of 0.5–4.0 μm
Zinc-nickel plating significantly outperforms other coatings in three main areas:
- Enhanced corrosion resistance
- Improved wear resistance for moving parts
- Reduced thermal stress on components exposed to higher operating temperatures
During the galvanization process, Zn-Ni coatings also exhibit excellent coverage in complex geometries and deep cavities.
Corrosion Protection
Zn-Ni coatings are designed to provide two to three times the corrosion protection of conventional zinc coatings. The alloy’s uniform crystal structure creates a thin, even protective layer across the coated surface.
Aluminum components are increasingly used in automotive parts. Due to aluminum’s high potential when in contact with steel, aluminum parts are prone to galvanic corrosion. Accelerated corrosion testing demonstrates that zinc-nickel coatings also protect against this phenomenon, commonly referred to as the “battery effect.”
How Zinc-Nickel Plating Works
The galvanic process involves immersing the metal part in a zinc-nickel salt solution, which is then subjected to an electric current. Zinc and nickel ions are attracted to the metal surface and deposit to form a zinc-nickel alloy layer.
Properties, Characteristics, and Advantages of Zinc-Nickel
This alloy provides several industrially desirable properties:
- High corrosion and wear resistance
- Hardness and thermal stability
- Good electrical conductivity, suitable for electrical applications
In summary, zinc-nickel galvanic plating is a highly effective method to protect metal parts from wear and corrosion. Zn-Ni alloys outperform pure zinc or nickel electroplating, making them ideal for industrial applications.