Plated steel material

Abstract

A plated steel material has a steel material, a plating layer that covers the surface of the steel material, and an interface alloy layer formed at the boundary between the steel material and the plating layer, wherein: the compositional makeup of the plating layer includes, in mass%, 20-83% of Zn and 2.5-46.5% of Al, the remaining portion being Mg and impurities, and the Mg content being not lessthan 10%. The structure of the plating layer comprises a quasicrystal phase, a MgZn2 phase, and a remaining structure; the area fraction of the quasicrystal phase is 30-60%; at least 90% by number ofthe quasicrystal phase is a quasicrystal phase of which the particle size in the longitudinal axis direction thereof is 0.05-1.0 [mu]m; the thickness of the plating layer is not less than 0.1 [mu]m;and the thickness of the interface alloy layer is not greater than 500 nm.

Description

technical field [0001] The present disclosure relates to plated steel. Background technique [0002] Conventionally, improvement of the corrosion resistance of steel materials by coating the surface of steel materials with a metal such as Zn has been carried out. At present, steel materials coated with Zn, Zn-Al, Zn-Al-Mg, Al-Si, etc. are also produced. Coating of steel materials is often required not only corrosion resistance but also wear resistance and adhesion after processing. As a coating method for steel materials, hot-dip plating suitable for mass production is most widely used. [0003] Corrosion resistance required for coating of steel materials is increasing year by year. Therefore, in recent years, as shown in Patent Document 1 and Patent Document 2 below, plating in which the Mg content is increased to a level higher than conventional ones has also been proposed. However, if an attempt is made to increase Mg to a level higher than conventional ones, there is ...

AI Technical Summary

Problems solved by technology

[0006] In order to improve the corrosion resistance of steel materials, Zn is basically added to the plating layer in the same way as the formation of the plating layer. However, for many applications, the film added with only Zn often becomes a film with insufficient corrosion resistance.

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