The straining influence on the corrosion resistance of cold-rolled and zinc-coated steel sheets was investigated through natural and accelerated corrosion tests. Cracks are detected or not after straining according to the coating nature. When they appear, two morphologies are observed: paving with a kind of brittle rupture and cracks in all directions with a ductile rupture. However, whatever the behaviour, the whole surface is phosphated. A 5% plane strain does not really modify the delamination rate while a 15% stretching increases it, especially in the case of straining sensitive coatings. The Scab test appears to be the more appropriate test to reveal the strain influence.
Corrosion of cold-rolled and zinc-coated steel for automobiles influence of corrosion test and straining mode
2001
6 Seiten, 7 Bilder, 4 Tabellen, 5 Quellen
Conference paper
English
Corrosion and corrosion test methods of zinc coated steel sheets on automobiles
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