Zn 8b [best] | Din 50961 Fe

: The supplementary treatment, specifically indicating bright (blue) chromating . 2. Understand the coating thickness

According to DIN 50961, the corrosion resistance for a blue-passivated zinc coating (type b) is significantly lower than yellow or olive-drab passivation. Under neutral salt spray testing (NSS per ISO 9227): din 50961 fe zn 8b

Choose DIN 50961 Fe/Zn 8b for steel parts requiring a thin zinc layer (8 µm minimum) with a decorative, passivated finish (blue or yellow) for mild indoor corrosion protection. Confirm with your plater whether blue or iridescent yellow is intended, and ensure trivalent chromium is used for regulatory compliance. : The supplementary treatment