Effect of Organic Film on Press-Formability of Organic Composite Coated Steel Sheet 910764
Organic composite coated steel sheet, consisting of Zn-Ki electro-plated layer and the organic film with a thickness of about 1 μm, has been developed to provide excellent press-formability and weldability as well as corrosion resistance required for automobile panels.
In this paper, we describe the results of studies on the relationship between the composition of the organic film and press-formability of organic composite coated steel sheet.
The results are as follows:
Drawability of organic composite coated steel sheet is improved to the level similar to Zn-Ni electro-plated steel sheet, because the organic film containing lubricants can reduce the frictional resistance at draw-bead.
The powdering of Zn-Ni layer occurred in press forming can be decreased by the organic film with lubricants.
Organic composite coated steel sheet with the organic film containing lubricants has excellent drawability similar to Zn-Ni electro-plated steel sheet and can decrease powdering in press forming.