Dezincification-Resistant (DZR) Brass CW602N for Humid Subtropical Facilities
Engineering Overview: Metallurgical guide on Dezincification-Resistant (DZR) CW602N brass for lock cylinders installed in high-humidity tropical and coastal resort doors.
Technical & Engineering Specifications
| Alloy Grade | CW602N (CuZn36Pb2As / DZR Brass / C35330) |
|---|---|
| Application | Tropical Coastal Hotels, Waterparks, Offshore Living |
| Corrosion Test | ISO 6509 Dezincification Resistance Standard |
| Arsenic Additive | 0.02% to 0.05% As (Dezincification Inhibitor) |
| Depth of Penetration | < 100 um Maximum allowable after acid immersion |
The Dezincification Threat
In hot, humid subtropical climates with high airborne moisture, standard brass alloys undergo dezincification—a galvanic corrosion where zinc leaches out, leaving a fragile, porous copper sponge that causes cylinder bodies to crumble.
CW602N (CuZn36Pb2As) Metallurgy
- Arsenic Inhibitor (0.02%–0.05% As): Forms an electrochemical barrier preventing beta-phase zinc dissolution.
- ISO 6509 Certified: Depth of dezincification is strictly limited to < 100 μm, ensuring 20+ year lifespan in tropical resorts.
Frequently Asked Engineering & Selection Questions
Q1: What is DZR brass and why is it used in locks?
Dezincification-Resistant (DZR) brass contains trace arsenic to prevent zinc from leaching out in humid tropical climates, stopping structural weakening.