Zinc Blue Plating
Bright zinc electroplating with blue passivation for sacrificial corrosion protection and a clean, uniform silver-blue finish.
View process detailsElectroplating service · Nashik, Maharashtra
Trivalent Blue Plating Services in Nashik
Trivalent blue plating replaces conventional hexavalent chromate with a trivalent chromium (Cr3+) passivation over the zinc deposit. The result is a clear-blue finish that is free of hexavalent chromium, meeting RoHS and ELV requirements that OEMs and export customers increasingly demand, without giving up corrosion protection. This is our recommended finish for new automotive programmes.
Why choose this finish
Benefits of Trivalent Blue Plating
Hexavalent chromium free
Cr3+ passivation supports RoHS, ELV and REACH-driven customer requirements.
OEM and export ready
Widely accepted by automotive OEMs and Tier suppliers for domestic and export programmes.
Stable colour and performance
Trivalent films are less affected by heat than hexavalent chromates, holding performance after baking.
Clean modern appearance
Bright silver with a clear-blue tint, consistent across the batch.
Specifications
Typical process parameters
Indicative values. Final thickness, passivation and testing requirements are set to your drawing or referenced standard at quotation.
| Base metals | Mild steel, alloy steel, forged and machined steel components |
|---|---|
| Typical thickness | 5 to 12 microns (higher on request, per drawing) |
| Passivation | Trivalent chromium (Cr3+) blue passivation, hexavalent free |
| Appearance | Bright silver with a clear-blue tint |
| Salt spray guidance | Typically 48 to 96 hours to white rust (ASTM B117), dependent on thickness and geometry |
| Compliance | Supports RoHS and ELV hexavalent chromium restrictions |
Applications
Commonly plated components
- OEM automotive fasteners
- Export-oriented components
- Electrical and electronic enclosures
- Engine and transmission hardware
How we process it
- 01 Inward challan and batch registration
- 02 Degreasing and acid wash
- 03 Trivalent Blue Plating
- 04 Inspection and industrial packing
- 05 Dispatch with outward challan
FAQ
Trivalent Blue Plating questions
Is trivalent blue plating RoHS compliant?
Trivalent passivation contains no hexavalent chromium, which is the substance restricted under RoHS and the EU End-of-Life Vehicle directive. It is the standard route to a compliant zinc plated finish.
Does trivalent blue protect as well as hexavalent blue?
Modern trivalent blue passivations deliver comparable or better salt spray performance to traditional hexavalent blue chromates, and they hold that performance after heat exposure. For higher requirements, a lacquer or sealer top coat can be added.
What is TRI-BLUE on my delivery challan?
TRI-BLUE is our short code for trivalent blue passivated zinc plating. It refers to the same process described on this page.
Related services
Other finishes we offer
Zinc Yellow Plating
Zinc plating with yellow passivation for enhanced corrosion resistance and the characteristic iridescent gold-yellow finish.
View process details
Trivalent Yellow Plating
Trivalent (Cr3+) yellow passivation over zinc for a hexavalent-free finish with high corrosion resistance and a yellow-iridescent look.
View process details