Din 50961 | Fe Zn 8b Best

The designation DIN 50961 Fe/Zn 8b specifies a technical surface treatment for iron or steel parts involving electroplated zinc. Trojan Special Fasteners Ltd Breakdown of the Code:

b: The supplementary treatment, specifically indicating bright (blue) chromating. 2. Understand the coating thickness din 50961 fe zn 8b

• ✅ Good corrosion protection – typically 120–240 hours to red rust in neutral salt spray test (depending on exposure conditions).
• ✅ Excellent adhesion for paints and organic coatings (if required).
• ✅ Distinctive yellow/iridescent appearance for easy visual identification.
• ✅ Moderate cost – economical for many industrial applications.
• ⚠️ Contains Cr(VI) in traditional formulations – RoHS restrictions may apply. Many suppliers now use Cr(III) alternatives while maintaining the “b” classification.

5. Corrosion Resistance (optional, per request)

• Salt spray test per ISO 9227.
• Typically 6–12 hours to white rust (5% surface area).

refers to the type of "passivation" or chromate conversion coating applied over the zinc. In the DIN 50961 system: is clear/blue (transparent). iridescent/yellow is olive green. The designation DIN 50961 Fe/Zn 8b specifies a