Patent ID: 9080231
Filing Date: 2015-07-14
Classification: B05D,C23C,Y10T

Abstract:
1. A hot-dipped steel comprising a steel substrate with an aluminum-zinc alloy plating layer formed thereon, said aluminum-zinc alloy plating layer containing Al, Zn, Si and Mg as constituent elements thereof, wherein said aluminum-zinc alloy plating layer contains 0.1% to 10% by weight of Mg, said aluminum-zinc alloy plating layer contains 0.2% to 15% by volume of an Si—Mg phase, the weight ratio of Mg in the Si—Mg phase to the total weight of Mg is 3% or more, and the aluminum-zinc alloy plating layer further contains 0.02% by weight to 1.0% by weight of Cr as a constituent element thereof, protrusions having height of greater than 200 μm and steepness greater than 1.0 are no longer present on a surface of the aluminum-zinc alloy plating layer.