Short answer: A duplex system applies compatible paint over hot-dip galvanizing so the two protections add up to 4 to 6 times the life of paint alone, with the galvanizing route in our Galvanizing Supplier page and the process in our Hot-Dip Galvanizing Guide.
At a Glance
What a Duplex System Is
Painting over galvanized steel combines barrier and sacrificial protection, with the coating overview in our Metal Coating Supplier page and the zinc base in our Galvanized Steel Buyers Guide.
Why Life Adds Up
Galvanizing stays intact if paint is scratched, and paint shields the zinc, so life multiplies rather than adds, with the structural view in our Metal for Construction Guide.
| System | Relative life | Use |
|---|---|---|
| Paint alone | 1x | Mild |
| Galvanize | 2 to 3x | Outdoor |
| Duplex | 4 to 6x | Harsh |
Preparation and Paint Choice
Surface must be clean and often lightly abraded or primed for paint adhesion; specify the paint system and film build.
Best Applications
Bridges, marine and industrial structures gain the most, with the coastal view in our Metal for Marine Guide and the structural view in our Metal for Construction Guide.
Quality and Certification
Coating mass and paint thickness are verified, with verification in our Quality Inspection Guide and the document detail in our Mill Test Certificate Guide.
Buyer Checklist
Define galvanize class, paint system and film; plan quantity and timing with our MOQ and Lead Time Guide and price with our Price Quotation Guide.
Get a Quote
Tell HXSCO your requirements and we will respond with a competitive quote and lead time.
자주 묻는 질문
4 to 6 times paint alone.
Yes – with compatible paint.
Yes – harsh environments.
Clean and prime for adhesion.
Coating mass and paint DFT.
Get a Duplex System with HXSCO
HXSCO arranges galvanizing plus compatible paint for a duplex system with coating and DFT reports. Send part type, environment and spec for a quote.