Community Research and Development Information Service - CORDIS


To support the lengthy corrosion warranties currently on offer, the automotive industry has increased the amount of zinc coated steels used in the autobody construction. This practice of bimetallic coupling can result in a variety of electrochemical reactions which can affect the pretreatment and painting of the autobody. This report presents the results of a study of the metallic corrosion, pretreatment uptake across the bimetallic joints, and paint performance of a number of bimetallic couples. The couples were fabricated from a permutation of the following automotive materials:

- Cold-reduced steel (CRS);
- Electroplated zinc coated steel (EZ);
- Electroplated zinc/13 % nickel coated steel (Zn-Ni);
- Galvannealed iron/zinc coated steel (IZ);
- Hot-dip zinc coated steel (HDG).

Samples from areas at the joints and areas away from the joints were examined by scanning electron microscopy, dispersive X-ray spectrometry, outdoor exposure, accelerated corrosion testing, electrochemical testing and paint adhesion tests. tests.

Additional information

Authors: QUARSHIE R, British Steel, Swinden Technology Centre, Rotherham (GB)
Bibliographic Reference: EUR 17854 EN (1998) 97pp., FS, ECU 16.50
Availability: Available from the (2)
ISBN: ISBN 92-828-1695-8
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