Patent ID: 9598759
Date: 2017-03-21
CPC Classifications: B32B,C22C,C23C

Claim:
1. A method for producing a black-plated steel sheet, comprising: reducing an oxygen concentration in a closed vessel to 13% or less by replacing air in the closed vessel with an inert gas or removing the air in the closed vessel; providing a hot-dip Al and Mg-containing Zn-plated steel sheet comprising a hot-dip Al and Mg-containing Zn-plated layer which comprises 0.1 mass % or more and 22.0 mass % or less of Al, and 0.1 mass % or more and less than 1.5 mass % of Mg; and contacting the hot-dip Al and Mg-containing Zn-plated steel sheet with water vapor in the closed vessel.