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Aluminum cannot be reliably brazed without pretreatment. Chemical nickel-phosphorus (ENiP) creates a metallically pure surface for reliable brazed joints while also providing corrosion protection, a diffusion barrier, and mechanical stability in a single coating system.
Miba manufactures everything from single-unit production to large-scale series production, fully automated and using stable processes. Multi-layer systems and selective coatings can also be implemented
Metallically pure surface for reliable soldering and bonding.
Verified through HALT (Highly Accelerated Life Tests), salt spray testing, and thermal cycling.
Only surfaces relevant to function are coated.
Electroless nickel plating can be applied to aluminum even in complex cooling structures.
Tool design, raw part procurement, and assembly - all from a single source
Aluminum poses specific challenges in power electronics that cannot be overcome without targeted surface treatment.
Chemical nickel plating on aluminum solves all four challenges with a single coating system.
Chemical nickel-phosphorus serves multiple functions simultaneously. The coating system is specifically tailored to meet requirements for solderability, corrosion protection, or mechanical stability.
Chemical nickel plating provides a metallically pure surface for aluminum cooling systems, ensuring reliable solder joints. During soldering, an intermetallic phase (Ni₃Sn₄) forms, creating a strong, material-bonded joint. The hard nickel layer stabilizes the bond pad structure and can thus reduce the risk of cratering during wire bonding.
High-phosphorus variants containing more than 10% phosphorus form an amorphous layer without grain boundaries. This layer isolates the aluminum from coolants, casting compounds and adhesives, and prevents galvanic corrosion in mixed assemblies with copper, steel or brass.
We offer chemical nickel plating on aluminum with various additive systems, such as PVD top coats, to optimally combine corrosion protection and solderability.
The nickel layer prevents the reformation of the high-resistance aluminum oxide layer. The electrical contact resistance remains consistently minimal. In busbar contacts, it prevents aluminum creep under screw pressure.
The electroless process ensures a uniform coating thickness of 3.0–6.0 µm, even in blind holes, threads, and complex cooling structures. The process is suitable for components with tight tolerances, mating surfaces and sealing seats.
Contact us now!
A manufacturer of aluminum cooling elements for power electronics needed a protective coating solution to ensure a reliable soldering process with a required service life of decades.
Working closely with the customer, Miba developed a chemical nickel-on-aluminum coating as a high-phosphorus plating system with selective masking and qualified it through HALT testing, salt spray testing, and thermal cycling.
