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  • Painted products used in the automotive industry: improvement in the anti-corrosion role played by epitaxial growth of the phosphate coating in the metal-paint bond


The object of the research is to improve knowledge of the influence exerted on the metal-paint bond by the metallurgical characteristics (morphological and structural) of the steel substrate. More precisely, the study covers the effect of variation in cold-rolling parameters on the trend of surface texture distribution of hot-rolled, pickled strip. It also considers the influence of the deformation generated by forming on the surface texture and morphology of cold-rolled strip, batch annealed using the typical works cycle adopted for deep-drawing steel. This is related to the morphological, structural and compositional characteristics of the phosphate layer obtained and the consequent variation of the strength of the metal-paint bond, evaluated as a percentage of area stripped after cathodic wet adhesion (CWA) tests and as the corrosion resistance of the painted sheet in accelerated laboratory corrosion tests.

Additional information

Authors: ALOTA S, Centro Sviluppo Materiali SpA, Roma (IT);URSINI O, Centro Sviluppo Materiali SpA, Roma (IT)
Bibliographic Reference: EUR 12505 IT (1990) 58 pp., MF, ECU 4, blow-up copy ECU 7.50
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