Zinc-Nickel Plating

Zinc Nickel Plating for Quick Couplings: Enhanced Performance and Protection

Zinc-nickel (Zn-Ni) plating is gaining traction as a superior surface treatment for quick couplings, offering numerous advantages over traditional options like trivalent chrome.

Enhanced Corrosion Resistance: Zn-Ni boasts superior corrosion resistance, often lasting over three times longer than trivalent chrome in salt spray tests.

  • Reduced maintenance: Less frequent replacement of corroded couplings due to extended lifespan.
  • Improved performance: Consistent operation without leaks or malfunctions caused by corrosion.
  • Enhanced equipment longevity: Protection of other connected components from corrosion spreading.

Additional Benefits:

  • Excellent corrosion resistance: Zinc-nickel coatings outperform both pure zinc and pure nickel plating in terms of corrosion resistance, especially in harsh environments like salt spray, humidity, and acidic conditions.
  • Sacrificial protection: Similar to zinc alone, the zinc in the zinc-nickel coating acts sacrificially, meaning it corrodes first to protect the underlying metal from rust and decay.
  • Durability: Zinc-nickel coatings are harder and more wear-resistant than pure zinc, improving the longevity of components.
  • Ductility: The coating maintains good ductility, allowing for forming and bending without cracking.
  • Environmentally friendly: Zinc-nickel plating is a more environmentally friendly alternative to cadmium plating, which is being phased out due to its toxicity.
  • RoHS compliant: Zinc-nickel coatings are RoHS compliant, making them suitable for use in various applications subject to restrictions on hazardous substances.
  • Higher abrasion resistance: Zn-Ni provides better protection against wear and tear, particularly beneficial for heavy-duty applications.
  • Improved lubricity: Smoother coupling engagement and disengagement, reducing wear and tear on internal components.

Specific Advantages for Quick Couplings:

  • Frequent connection/disconnection: Zn-Ni’s robust nature withstands repeated coupling cycles without compromising performance.
  • Exposure to harsh environments: Ideal for applications facing salt, moisture, or other corrosive elements.
  • Improved safety: Reduced risk of leaks and malfunctions due to corrosion, ensuring optimal system safety.

Zn-Ni plating offers a significant upgrade for quick couplings, boosting their performance, reliability, and longevity. If you’re looking for robust and durable quick couplings for demanding applications, Zn-Ni should be at the top of your list.

Salt Spray Testing for Zn-Ni Plating: Evaluating Corrosion Resistance

Salt spray testing is a standard method for evaluating the corrosion resistance of materials, particularly metals and metal coatings. In the context of Zn-Ni plating, salt spray testing plays a crucial role in assessing its ability to withstand harsh environments and protect the underlying substrate from corrosion.

Test Procedure

  • Specimens with Zn-Ni plating are placed in a chamber where they are exposed to a continuous mist of a salt solution, typically 5% sodium chloride (NaCl).
  • The temperature and humidity within the chamber are also controlled to replicate real-world conditions.
  • The test duration can vary depending on the desired level of evaluation, ranging from a few hours to several thousand hours.


F7200 Series Flat Face quick Couplings
HJP 10 NPT 3 8 2
ff125 bsp 12 1