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

摘要

DISCLOSED HEREIN IS A WELDABLE PRE-SEALED STEEL SHEET WITH IMPROVED CORROSION 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 ONE SURFACE OF THE METAL BASE, AND (C) A PRE-SEALED RESIN COATING LAYER FORMED ON 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, THE WELDABLE PRE-SEALED STEEL SHEET EXHIBITS SUPERIOR CORROSION RESISTANCE, CHEMICAL RESISTANCE, PROCESSABILITY, ELECTRODEPOSITION PAINTABILITY AND ADHESIVENESS AFTER PROCESSING, AS WELL AS IMPROVED WELDABILITY.