There is a growing demand for corrosion protection in automotive hems and flanges without using additional materials, such as waxes and sealers. Kobe Steel developed, in the past, zinc-rich primer painted galvannealed steel sheets. In order to improve weldability and to lower the production cost, a new pre-painted steel sheet has been developed. The new steel sheet is coated with epoxy resin containing FeP pigments (50mass%) with a maximum particle diameter of 12 microns on the galvannealed layer. The new steel sheet exhibits excellent formability, an extended welding tip life and a higher corrosion resistance.
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