Coating service
Zinc
I. SPECIFICATION
Electroplating of the zinc are dedicated for the defence of iron and steel against corrosion in different atmospheric exposure.
II. OPERATING, A TECHNICAL LIFE AND CLASSIFIED INDEX
Demanded thickness of the zinc depends upon operating condition and upon demanded length of the life coating, e.g. FeZn 5 recommends on arid internal coatings. With higher pretension must be specified larger thickness of zinc.
Classified index of coating:
- electrolytic exclusion of coating
- EN 12329 - norm specification
- Fe - chemical mark of metal foundation
- Zn - chemical mark of zink
- 12 - thickness of zinc coating
- C - type mark of chromate coating
Example: electroplating EN 12329-Fe//Zn12//C/
III. CONVERSION COATINGS OF CHROMATE AT THE ZINC
Chromating of coatings of zinc, as a next operation at zinc coatings according to ISO 4520, delays rising of the corrosion basis at the coatings, which are using in the aggressive atmosphere. Chromating slows down rising of the white corrosion, which forms on zinc coatings in the specific articles.
| Mark | Type | Typical aspect |
| A | achromatic | transparent, achromatic, eventual small sea-bow |
| B | no dyed | transparent, small sea-bow |
| C | sea-bow | yellow sea-bow |
| D | frosted | olive-coloured |
| F | black | black |
IV. CHROMATING COATING ECOTRI
Ecological chromate Ecotri is exchromating passivation of zinc with high anticorrosive protection. It is advisable on passivation coatings of zinc and alloy, which does not contain Cr6+ and fluoride.
