Patent ID: 6749953
Filing Date: 2004-06-15
Classification: C23C,C23F,C25D,Y10T

Abstract:
A whiskerless galvanized product having a multi-layer rust prevention film, comprising a galvanized film, formed to adhere strongly on a surface of a metal substrate, having a lattice distortion of 0.02 to 0.35% of plated film measured by an X-ray diffractometer and a carbon content of 0.01 to 0.07 mass % in plated film, a first rust prevention film mainly containing tannic acid and formed to adhere strongly on the surface of said galvanized film, a second rust prevention film containing mainly metal ions and/or metal compounds formed on an upper portion of said first rust prevention film, and a third rust prevention film mainly containing tannic acid and formed to adhere strongly on said second rust prevention film.