BLACKENED STEEL STHEET WITH HIGH ADHESION PROPERTY OF BLACKENED LAYER AND SURFACE APPEARANCE, AND METHOD FOR MANUFACTURING THE SAME

摘要

The present invention is to improve the blackened layer adhesion and surface appearance provides excellent black steel and facilitate this and intended to provide a method for producing environmentally friendly . To this end , the present invention is a zinc or zinc-based alloy coated steel sheet ; Ni layer formed on the surface of the zinc or zinc-based alloy coated steel sheet ; And The adhesion layer comprises a blackening blackening layer formed on the Ni layer provides excellent black steel sheet and method for producing them . ;