Din 50961 Fe Zn 8b Jun 2026

This number defines the minimum coating thickness in micrometers (

: Specifies the minimum coating thickness in micrometers (µm). A thickness of 8 µm is roughly equivalent to 0.00031 inches.

While DIN 50961 was a dominant standard for years, it has been largely superseded by , which uses a different designation format.

The DIN 50961 standard was officially withdrawn and replaced by international standards to harmonize global manufacturing practices. If you are updating legacy drawings or sourcing parts internationally, the closest modern equivalents are found under .

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: din 50961 fe zn 8b

The passivation layer is critical because it significantly increases the time it takes for white rust (zinc corrosion) to form. The "b" (yellow) passivation is historically known for providing excellent corrosion protection compared to blue/clear passivations.

Internal cabin brackets, clips, and dashboard structural components.

However, ISO 2081 no longer ties specific corrosion resistance to color; you must specify required hours to white/red rust separately (e.g., "≥12 h to white rust").

To ensure the zinc and chromate layers are securely bonded, tests such as the or the peel test are conducted. This prevents the coating from flaking or peeling during part assembly or use. This number defines the minimum coating thickness in

Note: While DIN 50961 has been updated and partially replaced by DIN EN ISO 2081, many legacy specifications still refer to it. Breaking Down the Designation: Fe//Zn 8b

Corrosion resistance for plated components is standardly verified using a Neutral Salt Spray Test (NST) according to ISO 9227 or DIN 50021. A typical component plated to DIN 50961 Fe/Zn 8b will meet the following minimum thresholds: Corrosion Type Typical Resistance Hours (Salt Spray Test) (Corrosion of the zinc layer) 8 to 24 hours Red Rust (Corrosion of the steel substrate) 48 to 72 hours

The final letter indicates the type of post-treatment applied over the zinc layer. Under the historic DIN 50961 standard, designates a yellow chromate coating (often referred to as yellow iridite or yellow zinc).

| | Passivation Type | Common Industry Names | Typical Color / Appearance | | :--- | :--- | :--- | :--- | | A | Without passivation | No post-treatment | Metallic zinc (silver/white) | | B | Blue chromating | Blue passivation, Bleached | Bright blue or clear with a bluish tint | | C | Yellow (iridescent) chromating | Yellow zinc, Iridite | Yellow with a rainbow iridescence | | D | Olive chromating | Olive drab | Dark olive green or khaki | | F | Black chromating | Black passivation | Deep, uniform black | | d | Sealing (additional post-treatment) | Top coat, Sealer | Often colorless; applied after passivation | The DIN 50961 standard was officially withdrawn and

| Component | Meaning | Details | | :--- | :--- | :--- | | | The governing standard | German industrial standard for electroplated zinc coatings on iron and steel. Superseded by DIN EN ISO 2081 (but still widely used in legacy drawings). | | Fe | Base Material | Ferrous material (Iron/Steel). The coating system is designed for steel substrates. | | Zn | Coating Material | Zinc . The primary metallic layer applied via electroplating. | | 8 | Coating Thickness | 8 µm (microns) minimum local thickness of the zinc layer. | | b | Post-Treatment Type | Blue passivation (iridescent blue to slightly yellowish/rainbow effect). Low chromate (Cr III or Cr VI historical). |

Disclaimer: DIN 50961 has been officially replaced. It is recommended to use modern DIN EN ISO 2081 standards for new designs. DIN 50961 Electroplated ZN Coating | PDF - Scribd www.scribd.com Electroplated coatings of zinc / zinc-alloy

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