SN-BASED METAL-COATED STEEL STRIP EXCELLENT IN APPEARANCE AND PROCESS FOR PRODUCING SAME

摘要

A Sn-based metal-coated steel strip excellent in appearance comprises a Ni-based metal (such as Ni, a Ni-Sn alloy, a Ni-Zn alloy, a Ni-Fe alloy and a Ni-Co alloy) preplating layer and a Sn-based metal (such as a Sn-Zn alloy) coating formed thereon, and is characterized in that a Ni emission intensity line and an Fe emission intensity line obtained by glow discharge spectroscopy of the surface of the coated steel strip satisfy a relationship of the formula: T 1 >=T 2 wherein T 1 is a sputtering time at the peak of a Ni emission intensity line, and T 2 is a sputtering time at the inflection point of an Fe emission intensity line, or a relationship of the formulas: T 1 >=T 2 , and 1<=T 1 /T 2 <=1.5