Patent ID: 6129995
Filing Date: 2000-10-10
Classification: C23C,C25D,Y10T

Abstract:
A zinciferous coated steel sheet comprising:a steel sheet;a zinciferous coating layer which is formed on the steel sheet;a Fe--Ni--Zn--O film which is formed on the zinciferous coating layer;an oxide layer which is formed on a surface portion of the Fe--Ni--Zn--O film;the Fe--Ni--Zn--O film comprising metallic Ni and an oxide of Fe, Ni and Zn;the Fe--Ni--Zn--O film having a Fe ratio of 0.004 to 0.9 and a Zn ratio of 0.08 to 0.6, said Fe ratio being a ratio of Fe content (wt. %) to the sum of Fe content (wt. %), Ni content (wt. %), and Zn content (wt. %) in the Fe--Ni--Zn--O film, said Zn ratio being a ratio of Zn content (wt. %) to the sum of Fe content (wt. %), Ni content (wt. %), and Zn content (wt. %) in the Fe--Ni--Zn--O film;the oxide layer comprising an oxide of Fe, Ni and Zn; andthe oxide layer having a thickness of 0.5 to 50 nanometer.