Can brass be nickel plated?
Yes. Brass is one of the easiest base metals to nickel plate. Use a copper strike under bright nickel for decorative work or electroless nickel for wear; watch lead smear on C360.
Brass is plated every day: bright nickel on fittings, instrument hardware and plumbing trim, electroless nickel on connectors and wear parts, and nickel as the barrier under chrome or gold. The base metal is conductive, clean, and free of the oxide problems aluminum or stainless present. On C360 the one preparation issue is lead. Machining smears lead over the surface, and lead does not accept plating well; the plater removes it with a brief acid dip (a fluoboric or nitric-based lead-removal step) after alkaline cleaning. A copper strike or a thin copper layer (5-10 µm) is normal before nickel: it levels the surface, improves adhesion and stops zinc from diffusing into the nickel over time, which causes staining and loss of adhesion on decorative parts.
Two nickel families. Electrolytic bright nickel (per ASTM B456 for decorative nickel-chrome, or AMS 2403) builds 10-25 µm (0.0004-0.001") for appearance and moderate corrosion resistance and is the base under decorative chrome. Electroless nickel (ASTM B733 or AMS 2404) deposits a uniform nickel-phosphorus alloy of 5-50 µm (0.0002-0.002") that follows bores and threads without edge build-up and can be heat treated to 850-950 HV for wear. Medium-phosphorus EN (6-9% P) is the general-purpose choice; high-phosphorus (10-13% P) for corrosion resistance and non-magnetic parts. Either kind works on C360 once the lead is removed, and both are used as the diffusion barrier under gold or silver in electrical hardware.
Design details: nickel does not throw into deep blind holes with electrolytic plating, so specify electroless where bores must be coated. Nickel is harder than brass and brittle in thick deposits, so bends or press fits after plating will crack it. Lead-free brass alternatives (C27450, C69300 and similar) are increasingly required for potable water hardware; they plate the same way and skip the lead-removal step. If the drawing needs tarnish protection only and the part is hidden, a clear lacquer or a thin electroless nickel is cheaper than a decorative bright nickel-chrome stack.
Nickel Plating for C360 parts: where to send them
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What to specify
- Plating type and spec: bright nickel per ASTM B456 (SC grade) or AMS 2403, or electroless nickel per ASTM B733 (Type and Class) or AMS 2404, with the phosphorus range for EN
- Thickness range: 10-25 µm (0.0004-0.001") for decorative nickel, 12-25 µm (0.0005-0.001") for general EN, 25-50 µm for wear; and whether dimensions apply before or after plating
- Copper strike or copper underplate (5-10 µm) under electrolytic nickel for adhesion and zinc-diffusion barrier
- Lead-smear removal step on C360 in the pre-treatment sequence
- Masking of threads, press fits and electrical contact faces, and which surfaces are cosmetic
- Post-plate heat treatment for EN hardness (for example 400 °C / 750 °F for 1 hour to reach 850-950 HV) if specified
- Adhesion test (ASTM B571 bend or tape) on a first article
Pitfalls
- Nickel peeling from C360 because the lead smear was not removed before plating
- Skipping the copper underplate on decorative parts and getting stains and blistering as zinc diffuses through the nickel
- Electrolytic nickel expected inside deep bores or on threads; it thins to nothing; use electroless
- Forming, staking or press fitting after plating and cracking the deposit
- Thickness build-up on sharp edges with electrolytic nickel throwing off a close fit
- Specifying nickel on a potable-water part made of C360, which fails lead-content rules regardless of the plating
Frequently asked questions
- Does nickel plating stick to brass?
- Yes, brass is an excellent base for nickel. C360 needs a lead-removal step after cleaning because machining smears lead on the surface. A copper strike under electrolytic nickel improves adhesion and blocks zinc diffusion.
- Electroless or electrolytic nickel on brass?
- Electrolytic bright nickel for appearance and as a base for chrome. Electroless nickel for uniform thickness on bores and threads, for wear (heat treatable to about 900 HV) and for connectors. Both work on brass.
- How thick is nickel plating on brass parts?
- Decorative bright nickel is typically 10-25 µm (0.0004-0.001"). Electroless nickel is 12-25 µm for general protection and 25-50 µm (0.001-0.002") for wear. Dimensions grow by the full thickness per surface.
