PRE-SEALED STEEL SHEET WITH IMPROVED ANTI-CORROSION AND WELDABILITY AND PREPARING METHOD THEREOF

摘要

Disclosed herein is a weldable pre-sealed steel sheet with improved corrosio n resistance and weldability. The pre-sealed steel sheet comprises (a) a metal base, (b) a chromium-free pre- treatment coating layer formed on at least on e surface of the metal base, and (c) a pre-sealed resin coating layer formed o n at least one surface of the chromium- free pretreatment coating layer. Since the weldable pre-sealed steel sheet does not contains heavy metals (e.g., chromium) harmful to humans, it is environmentally friendly. In addition, th e weldable pre-sealed steel sheet exhibits superior corrosion resistance, chemical resistance, processability, electrodeposition paintability and adhesiveness after processing, as well as improved weldability.