This letter indicates the type of post-plating conversion coating, historically referred to as chromating or passivation. The letter "B" specifically designates a clear to iridescent blue passivation (often called "blue bright" or Blauchromatierung ). The Role of Blue Passivation (The "B" Suffix)
This specification is very common for:
Typically occurs after 48 to 72 hours of continuous salt spray exposure. din 50961 fe zn 8b
The lowercase letter defines the conversion coating after zinc plating:
The specific target for corrosion resistance (e.g., hours to the first sign of red rust) varies based on the total coating system, but a standard Fe/Zn 8B must survive a defined period in these severe conditions without showing base metal corrosion. This letter indicates the type of post-plating conversion
DIN 50961 was a German national standard. To harmonize manufacturing across Europe and globally, it was withdrawn and replaced by ( Metallic and other inorganic coatings — Electroplated coatings of zinc with supplementary treatments on iron or steel ).
The designation refers to a specific standard for electroplated zinc coatings on iron or steel parts . While this standard has largely been succeeded by ISO 2081 , it is still frequently cited in engineering drawings and legacy specifications. 1. Decode the designation The lowercase letter defines the conversion coating after
Parts requiring both protection and good wear resistance.
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ISO 2081 Fe/Zn8/C (or Fe/Zn8/Cn/T2 for trivalent yellow)