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 |
3 |
2 |
12 |
| A2A, A2E, A2J |
5 |
6 |
24 |
| A3A, A3E, A3J |
8 |
6 |
48 |
| Blue Passivation |
B |
Blue Iridescent |
A1B, A1F, A1K |
3 |
6 |
12 |
| A2B, A2F, A2K |
5 |
12 |
36 |
| A3B, A3F, A3K |
8 |
24 |
72 |
| Yellow Chromating |
C |
Yellow Iridescent |
A1C, A1G, A1L |
3 |
24 |
24 |
| A2C, A2G, A2L |
5 |
48 |
72 |
| A3C, A3G, A3L |
8 |
72 |
120 |
| Olive Chromating |
D |
Olive Green |
A1D, A1H, A1M |
3 |
24 |
24 |
| A2D, A2H, A2M |
5 |
72 |
96 |
| A3D, A3H, A3M |
8 |
96 |
144 |
| Black Chromating |
BK |
Dark / Black |
A1R, A1S, A1T |
3 |
12 |
36 |
| A2R, A2S, A2T |
5 |
12 |
72 |
| A3R, A3S, A3T |
8 |
24 |
96 |