Dec 2025
DIN 50021 - Salt Spray Test
| Procedure Group |
Chromate Code |
Chromate Layer Appearance |
ISO 4042 Classification |
Nominal Layer (µm) |
White Rust (hrs) |
Red Rust (hrs) |
| Clear Passivation |
A |
Clear / Transparent |
A1A, A1E, A1J / A2A, A2E, A2J / A3A, A3E, A3J |
3 / 5 / 8 |
2 / 6 / 6 |
12 / 24 / 48 |
| Blue Passivation |
B |
Blue Iridescent |
A1B, A1F, A1K / A2B, A2F, A2K / A3B, A3F, A3K |
3 / 5 / 8 |
6 / 12 / 24 |
12 / 36 / 72 |
| Yellow Chromating |
C |
Yellow Iridescent |
A1C, A1G, A1L / A2C, A2G, A2L / A3C, A3G, A3L |
3 / 5 / 8 |
24 / 48 / 72 |
24 / 72 / 120 |
| Olive Chromating |
D |
Olive Green |
A1D, A1H, A1M / A2D, A2H, A2M / A3D, A3H, A3M |
3 / 5 / 8 |
24 / 72 / 96 |
24 / 96 / 144 |
| Black Chromating |
BK |
Dark / Black |
A1R, A1S, A1T / A2R, A2S, A2T |
3 / 5 / 8 |
12 / 12 / 24 |
36 / 72 / 96 |