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 with Lacquer Finish in Nashik
For components that need more than standard passivation can offer, we apply a clear lacquer top coat over trivalent blue passivated zinc. The lacquer seals the passivation layer, significantly extending time to white rust, resisting fingerprints and handling marks, and giving a glossy, premium appearance on visible parts. It remains hexavalent-chromium free.
Why choose this finish
Benefits of Trivalent Blue + Lacquer
Extended corrosion life
The lacquer seals the passivation and markedly increases salt spray performance.
Glossy, premium appearance
Ideal for visible hardware, trim and customer-facing assemblies.
Handling and fingerprint resistance
Parts stay clean-looking through assembly and storage.
Still hexavalent free
Builds on trivalent blue passivation for RoHS and ELV compliance.
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 | 8 to 12 microns zinc plus lacquer top coat (per drawing) |
| Finish system | Bright zinc, trivalent blue passivation, clear lacquer / sealer |
| Appearance | Bright silver-blue with high gloss |
| Salt spray guidance | Typically 200+ hours to white rust (ASTM B117), dependent on thickness and geometry |
| Compliance | Supports RoHS and ELV hexavalent chromium restrictions |
Applications
Commonly plated components
- Visible automotive hardware and trim fasteners
- Two-wheeler and appliance components
- Humid or coastal service conditions
- Parts stored for long periods before assembly
How we process it
- 01 Inward challan and batch registration
- 02 Degreasing and acid wash
- 03 Trivalent Blue + Lacquer
- 04 Inspection and industrial packing
- 05 Dispatch with outward challan
FAQ
Trivalent Blue + Lacquer questions
Why add lacquer over trivalent blue plating?
Lacquer seals the passivation film, which can extend salt spray performance from tens of hours to several hundred hours, and it protects the finish against fingerprints and handling marks. It is the cost-effective step up before moving to more expensive coating systems.
Does lacquer affect thread fit or torque?
A clear lacquer adds only a very thin layer, but on fine-pitch threads torque-tension behaviour can change slightly. Tell us the application and we will advise, or run a trial lot for your validation.
Is the lacquer finish hexavalent free?
Yes. The system is bright zinc with trivalent (Cr3+) blue passivation and a clear lacquer, so it contains no hexavalent chromium.
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 Blue Plating
Hexavalent-chromium-free trivalent (Cr3+) passivation over zinc, suited to RoHS and ELV-driven automotive supply chains.
View process details