Zinc Plating
电镀锌
Corrosion-resistant zinc plating with clear, yellow, or black chromate passivation for steel fasteners and components.
Zinc plating (electroplating) is one of the most cost-effective methods of protecting steel, iron, and other ferrous metals from corrosion. At Active Treatment, we apply zinc through an alkaline or acid chloride bath, achieving uniform coverage even on complex shapes.
After plating, parts are passivated with a chromate conversion coating in your choice of clear (blue-bright), yellow (iridescent gold), or black finish. The chromate layer significantly improves salt-spray resistance and provides a self-healing effect on minor scratches.
We process everything from small precision fasteners to large structural components, serving automotive, construction, and general engineering clients across Singapore and the region.
Key Benefits
- Excellent galvanic corrosion protection
- Choice of clear, yellow, or black chromate
- Cost-effective for high-volume runs
- RoHS compliant trivalent chromate options
- Meets BS EN ISO 4042 and ASTM B633
Specifications
| Standard | ASTM B633, BS EN ISO 4042 |
|---|---|
| Substrate | Steel, cast iron, copper alloys |
| Thickness | 5–25 µm |
| Chromate options | Clear, yellow, black |
| Salt spray resistance | 72–240 hours (with chromate) |
Frequently Asked Questions
What is the difference between clear, yellow, and black zinc plating?
The base zinc layer is the same. The colour difference comes from the chromate passivation applied after plating. Clear (blue-bright) offers a silver appearance, yellow provides better corrosion resistance and a gold hue, and black chromate gives a dark aesthetic with good protection.
Is yellow zinc chromate RoHS compliant?
Traditional hexavalent chromate is not RoHS compliant. We offer trivalent chromate (Cr3+) passivation, which achieves comparable corrosion resistance and is fully RoHS and REACH compliant.
How much zinc thickness do I need for outdoor use?
For outdoor or marine environments, we recommend a minimum of 12–25 µm with yellow or black trivalent chromate. This typically provides 240 hours of salt spray protection before red rust.
Can zinc plating cause hydrogen embrittlement?
Yes, acid zinc processes carry a hydrogen embrittlement risk for high-strength steels (>1000 MPa). We perform post-plate baking (190°C for 4+ hours) on high-strength parts to drive off absorbed hydrogen. Please specify material grade when placing orders.
What is the lead time for zinc plating?
Standard lead time is 3–5 working days. Express processing is available for urgent orders — please contact us to discuss your timeline.
Request a Quote
Contact Active Treatment Pte Ltd in Singapore for Zinc Plating. Call +65 6352 9846 or email activetreatment88@yahoo.com.sg.