Bichromatic zinc is a post-process passivation procedure for alkaline zinc or zinc bath with a layer determined by the standard or customer specification. It offers high resistance to white and red corrosion.
They are heat treatments containing chromium IV and are used with specific characteristics on a given metal surface. This protection of bichromatic zinc, exists in two different shades, white (white zinc plated) and yellow zinc (bichromatic zinc).
| Treatment Description | Treatment Code | Classification | Layer |
| BICROMATIZED ZINCTRIVALENTE | ZNBI-TRIV | TYPE 1 | 05A25 |
| TRIVALENT WHITE ZINC | ZNBC-TRIV | TYPE III | 05A25 |
| TRIVALENT BLACK ZINC | ZNPT-TRIV | TYPE VII | 05A25 |
| BLACK ZINC | ZNPT | TYPE VI | 05A25 |
| GREEN ZINC OLIVIA | ZNVO | TYPE II | 05A25 |
| ZINC PHOSPHATE ZINC PAINTING | ZNFO-PINTURA | TYPE IV | 05A25 |
| BICROMATIZED ZINC | ZNBI | TYPE VIII | 05A25 |
