Zinc nickel plating is a high-performance metal finishing technique used to enhance the corrosion resistance of metal components. By electroplating a layer of zinc-nickel alloy onto a metal surface, it creates a robust, long-lasting and highly effective protective barrier.
Typically containing 10-18% nickel, this coating has gained popularity due to its durability, reliability and compatibility with demanding operational environments. It is especially valuable in sectors where long-term performance and exposure to harsh conditions are consistently expected.
How the Process Works
The zinc nickel plating process begins with surface preparation, followed by immersion of the component into an electroplating bath containing zinc and nickel ions. An electric current is applied, triggering a chemical reaction that deposits the alloy evenly onto the substrate.
This uniform coating ensures consistent protection and improves the longevity of the finished component. The nickel content helps stabilise the coating, while zinc acts as the sacrificial element, corroding first to shield the base metal.
Benefits over Traditional Coatings
Zinc nickel plating offers several advantages over standard zinc plating and older methods like cadmium coatings. It delivers significantly higher corrosion resistance – up to five to ten times more – particularly in salt spray environments. As a result, it’s widely chosen for parts that face regular exposure to moisture or chemicals, such as those used in the automotive, defence and aerospace industries.
Additionally, this plating method supports environmentally responsible practices, being one of the most sustainable alternatives to cadmium, which has known environmental and health risks.
Industry Applications and Use Cases
The versatility of zinc nickel plating makes it ideal for a wide range of applications. Automotive manufacturers use it extensively on fasteners, brake systems, fuel components and structural fixings. Its superior performance and compatibility with post-plating treatments also make it suitable for pressings and electronic housings.
As industries continue to prioritise environmental standards and component longevity, the demand for zinc nickel plating is set to grow. With its proven benefits in corrosion resistance, mechanical strength and environmental compliance, zinc nickel plating remains a trusted and essential metal finishing solution.
