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The aim of this project is to correlate zinc-coating morphologies and textures with the corrosion resistance of both unpainted and painted materials. The research activity relevant to this project can be summarized as follows: - Evaluation of morphology, texture and corrosion behaviour of electrolytic zinc coatings produced by means of laboratory devices:
. Using an horizontal circulation cell;
. Using a vertical circulation cell, in order to scan a wider range of current densisties and electrolyte flow-rates.

- Pilot line production having controlled morphology and product assessment.

The results show that a relationship between applied current density and flow dynamics exists, allowing identification of three great zones (compact-crystalline, dendritic, discontinuous) where specific coating morphology can be reproducible even changing the experimental apparatus. A relationship between the morphology of each extended zone and the corrosion resistance of the coating exists, showing that compact-crystalline deposits have better corrosion behaviour than the other ones. Texture analysis, made by peak ratio method, has been used to show that all coatings have preferential orientations of crystal growing planes. The corrosion behaviour of the unpainted samples has been evaluated by means of salt spray cabinet test and electrochemical measurements of polarization resistance. ance.

Additional information

Authors: FALCIONI F, Centro sviluppo materiali SpA, Roam (IT);FERRARI V, Centro sviluppo materiali SpA, Roam (IT)
Bibliographic Reference: EUR 16682 IT (1997) 67pp., FS, ECU 11.50
Availability: Available from the (2)
ISBN: ISBN 92-828-0749-5
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