ISO 2081 Designation Codes
| Code | Designation | Description |
|---|---|---|
| Zn | Zinc Coating | Pure zinc coating applied for basic corrosion resistance on iron or steel. |
| A | Transparent Conversion Coating | Transparent chromate layer to enhance corrosion resistance. |
| B | Yellow Chromate Conversion | Yellow chromate layer for improved corrosion protection. |
| D | Blue Chromate Conversion | Blue chromate layer that provides moderate corrosion resistance and a decorative finish. |
| C | Clear Chromate Conversion | Colorless chromate layer for basic corrosion resistance. |
| SR(x)≥y | Stress Relief (SR) | Pre-electroplating heat treatment to relieve stress; x = temperature, y = hours. |
| ER(x)y | Embrittlement Relief (ER) | Post-electroplating heat treatment to reduce hydrogen embrittlement; x = temperature, y = hours. |
| T1, T2, T3 | Sealant Types (T1, T2, T3) | Organic or inorganic sealants applied for additional corrosion protection. |
ISO 2081 Examples
Example 1: Designation of an electrodeposited coating of 15 μm zinc (Zn15) on iron or steel (Fe) with a yellow chromate conversion coating (B) applied:
- Designation:
Electrodeposited coating ISO 2081 – Fe/Zn15/B
Example 2: Designation of an electrodeposited coating of 10 μm zinc (Zn10) on iron or steel (Fe), with stress relief heat treatment prior to electroplating at 250 °C for a minimum of 3 h, designated as SR(250)≥3, and post-electroplating hydrogen embrittlement relief heat treatment at 200 °C for 10 h, designated as ER(200)10. The coating has a blue chromate finish (D) and an organic sealant (T3):
- Designation:
Electrodeposited coating ISO 2081 – Fe/SR(250)≥3/Zn10/ER(200)10/D/T3
