| SurTec | Description | galvanic | appearance | corrosion- |
|---|---|---|---|---|
| process | undercoating | protection | ||
| SurTec 667 | trivalent Blue Passivation with good corrosion protection, contains cobalt | Zinc (acid, alkaline or cyanide) | bluish iridescent | ++ |
| SurTec 669 | Blue Passivation with middle layer thickness, good corrosion protection | Zinc (acid, alkaline or cyanide) | yellowish iridescent | +++ |
| SurTec 680 | Chromiting® – Thick Layer Passivation | Zinc (acid, alkaline or cyanide) | greenish iridescent | ++++ |
| Zinc/Iron | greenish/yellowish iridescent, darker | ++++ | ||
| Zinc/Nickel | bluish-violet iridescent, darker | ++++ | ||
| SurTec 680 LC | Chromiting® – Thick Layer Passivation, contains less cobalt | Zinc (acid, alkaline or cyanide) | greenish iridescent | ++++ |
| Zinc/Iron | greenish/yellowish iridescent, darker | ++++ | ||
| Zinc/Nickel | bluish-violet iridescent, darker | ++++ | ||
| SurTec 680 Y | Yellow Chromiting | Zinc (acid, alkaline or cyanide) | yellowish iridescent | ++++ |
| SurTec 695 | Black Chromiting for Zinc/Iron | Zinc/Iron | black, glossy (after sealing) | ++ |