Zinc, zinc-nickel, electroless nickel and chrome plating on steel and non-ferrous components, with RoHS-compliant trivalent passivation, thickness reports and salt spray testing to ISO 9227.
Most plating is specified to survive a corrosion test, so the useful question is how many hours of neutral salt spray the part must withstand. That number points directly to the plating and thickness needed.
Zinc-nickel costs more than zinc but lasts several times longer in salt spray, which is why automotive specifications have largely moved to it. State the required hours and the test standard on the drawing.
Traditional yellow zinc passivates used hexavalent chromium, which is now restricted under EU RoHS and REACH and heavily controlled elsewhere. Buyers supplying Europe or the automotive sector must specify trivalent.
High-strength steel parts must be baked after plating to drive out hydrogen. Without it, fasteners and springs can crack under load days after installation. Specify part hardness so the bake is applied correctly.
On specifications: the capabilities above reflect standard specifications for this process. Achievable tolerances and finishes for your part depend on geometry, material and quantity, and are confirmed at quotation after drawing review. Every first article ships with a full dimensional inspection report against your drawing, plus Material Test Certificates for the raw material. We do not ask buyers to take a capability claim on trust.
Plating is normally supplied as part of a component order, under the HS code for that component.
MOQ is discussed at order stage based on part complexity and material. Payment by advance TT, LC at sight, or DP/DA case by case.
Start from the salt-spray hours the part must survive. Standard zinc with passivation typically reaches 96 to 240 hours to red rust, while zinc-nickel reaches 720 to over 1000 hours. Electroless nickel gives uniform coverage on complex shapes, and hard chrome is for wear rather than corrosion. State the required hours and test standard on the drawing.
It lasts several times longer in salt spray for a similar thickness, which is why automotive specifications have largely moved to it. It costs more than plain zinc, so specify it where the corrosion requirement justifies it.
Yes. Trivalent chromium passivation is standard, which is compliant with EU RoHS and REACH. Hexavalent chromium passivates, the traditional yellow finish, are restricted in the EU and should be avoided for export. A compliance declaration is available on request.
Plating can introduce hydrogen into high-strength steel, which can cause fasteners and springs to crack under load days after installation. Parts above roughly 31 HRC hardness are baked after plating to drive the hydrogen out. Specify part hardness so the bake is applied.
Zinc is typically 8 to 12 micrometres for general use and up to 25 for harsher service. Thicker coatings improve corrosion resistance but affect thread fit on fasteners, so threaded parts are often specified to standards such as ISO 4042 that account for coating thickness.
Electroless nickel can be applied to aluminium with appropriate pre-treatment. For aluminium, anodising is usually the more economical and durable protective finish, while zinc plating is a steel finish.
Technical drawings welcome. FOB or CIF pricing within 24 hours. Third-party inspection available.
Technical drawings welcome. FOB or CIF pricing, samples available.
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