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The corrosion properties of coated, formed and joined non-weldable primed steel for automotive applications were studied with different painting systems of pre-coated steel. The results include a better comprehension on the mechanisms of corrosion of zinc in confined environments as well as the influence of climatic parameters on the micro-climates inside assemblies for pre-primed materials. A panel that allows simulating a door of a car with respect to forming and hem-flanges was developed in the project. The corrosion and mechanical properties of pre-primed materials was evaluated in various accelerated corrosion tests, under natural weathering exposures and on-vehicle. From the results, it is seen that these materials showed excellent corrosion resistance in hem-flanges. The creep from the edge was found, under accelerated corrosion testing, to be in the same range as materials used today in the automotive industry (i.e. hot-dip galvanised steel with electro-deposited paint). Furthermore, it is also seen that the materials in the assembling or formed area retained good mechanical properties after ageing in accelerated corrosion tests, and independently of the joining technique used (i.e. adhesive bonding, clinching and self-piercing rivets). A chromium-free system with chromium-free surface treatment and primer that was evaluated in the project showed results comparable to that of line-produced chromium-containing materials

Additional information

Authors: DE MEDEIROS C, Arcelor (IRSID), Montataire (FR);BERGLUND ÅHMAN A, SSAB, Borlänge (SE);THIERRY D, Swedish Corrosion Institute, Stockho;LE BOZEC N, m (SE)
Bibliographic Reference: EUR 21626 EN (2005), 85 pp. Euro: 15
Availability: Katalogue Number: KI-NA-21626-EN-S The paper version can be ordered online and the PDF version downloaded at:
ISBN: ISBN: 92-894-9691-6
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