Community Research and Development Information Service - CORDIS


Galvannealed sheet steel has a strong adhesion to paint, high corrosion resistance, good spot weldability and low production cost, so is attractive to the automative industry. Weaknesses may develop during production because of the composition and microstructure of the Fe-Zn coating formed during the galvanneal process. The growth of different Fe-Zn intermetallic phase layers is governed by composition of the steel substrate, zinc bath chemistry and galvannealing time-temperature cycle. The first aim of this research project was to set up suitable techniques for measuring and controlling this complex microstructure. Secondly, galvanneal test panels were produced over a range of process variables on different steel substrates. These were then evaluated with a variety of coatings, and the correlation between galvanneal process parameters and the coating's microstructure and powdering resistance properties was investigated.

Additional information

Authors: MALMENDIER M, CRM Leige (BE);SCHYNS M, CRM Leige (BE);ZACHETTI N, CSM Rome(IT);DELICAAT C, Hoogovens (NL);WORNER V, BST Welsh Laboratories, (GB)
Bibliographic Reference: EUR 18802 EN (1999) 91pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-5409-4
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