| 摘要 |
<p>PURPOSE:To produce a deep drawn can excellent in corrosion resistance by coating a steel sheet with tin-containing metal under specific conditions and further coating the whole surface, in succession, with metallic chromium, chromium hydrated oxide, and organic resin. CONSTITUTION:A steel sheet is coated with tin-containing metal (tin-iron alloy, etc.) so that the coating rate defined by equation becomes 20 to 80%. In the equation, VFe means the photoelectric density of Fe at the point of time when the photoelectric intensity of Fe and the photoelectric intensity of Sn reach a nearly stationary state when X-ray photoelectron spectroscopy is applied to the surface of the coated steel sheet to perform etching treatment, and VFeo means the photoelectric intensity of Fe at the point of time when etching is allowed to proceed further and the photoelectric intensity of Sn substantially reaches zero. Subsequently, the whole surface of the steel sheet is coated with metallic chromium (thickness, 10-200mg/m<2>) and chromium hydrated oxide (thickness, 1-50mg/m<2>), and further, a coating layer of organic resin (biaxially oriented polyester film layer thermocompression-bonded via epoxy-phenol resin type primer) is applied to about 3-50mum thickness.</p> |
