Fe Zn 8b - Din 50961

: Modern applications of "8b" usually utilize Trivalent Chromium ( Cr3+cap C r raised to the 3 plus power

Modern enforcement of and REACH restricts hexavalent chromium (Cr(VI)) in passivation layers. Traditional "type b" blue chromate often contained Cr(VI). din 50961 fe zn 8b

Electrodeposited zinc coating, 8 µm minimum local thickness on all functional surfaces, followed by trivalent blue/clear chromate passivation. No white rust before 8 hours NSS per ISO 9227. Hydrogen embrittlement relief: Bake at 200°C for 8 hours within 4 hours of plating for steel >1000 MPa. : Modern applications of "8b" usually utilize Trivalent

| Characteristic | | Fe Zn 12c | Fe Zn 8g | | :--- | :--- | :--- | :--- | | Thickness | 8 µm | 12 µm | 8 µm | | Passivation | Blue | Yellow (iridescent) | Clear/Colorless | | Red Rust (NSS) | ~72 hrs | ~120-180 hrs | ~24 hrs | | White Rust Resistance | Poor - 24 hrs | Good - 72 hrs | Poor - 8 hrs | | Contact Resistance | Low | Medium | Very Low | | Typical Use | Threaded fasteners, grounding clips | Brake lines, leaf springs | Appliance covers (cosmetic) | No white rust before 8 hours NSS per ISO 9227