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Chromate Spec Table
Chromate KS Specifications — 4 sizes
ISO 4520
ISOChromate
4 sizes| Grade | Thickness (μm) | Hardness (HV) | Corrosion (SST h) | Color | Note |
|---|---|---|---|---|---|
| 0.1~0.3 | - | 48 | ~ | 3 RoHS | |
| 0.1~0.3 | - | 72 | Parts | ||
| 0.3~0.5 | - | 96 | pcs | 6 , RoHS | |
| Black | 0.3~0.5 | - | 96 | Black | · |
This specification follows ISO (International Organization for Standardization) standards. ISO ensures cross-border compatibility, making it ideal for multinational projects, export equipment design, and global parts procurement.
Chromate conversion forms a chromate film on zinc-plated parts to boost corrosion resistance and determine color. Under RoHS, hexavalent chromium (yellow, black) is restricted; trivalent chromium (clear, blue) is now predominant. Film thickness is very thin (0.1–0.5 μm), adding 48–96 hours of SST resistance. The visual color (rainbow, blue, black) provides part identification and decorative appearance.