BLACK PLATED STRUCTURAL MEMBER AND BLACK PLATED STEEL SHEET FOR STRUCTURAL MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a black plated structural member and black plated steel sheet for a structural member with high corrosion resistance capable of obtaining black appearance without coating and having excellent sustainability of black appearance after processing.;SOLUTION: There is provided a structural member using a plated steel sheet as a raw material having a black plated layer which: is formed on the surface of a base steel member; has a molten Al/Mg-containing galvanized layer which contains 0.1 to 22.0 mass% of Al and 0.1 to 10.0 mass% of Mg and in which a black oxide of Zn is distributed in a plating layer; and exhibits black appearance in which the surface of the molten Al/Mg-containing galvanized layer has lightness L* value of 60 or less. There is provided a method for blackening a structural member in which the black oxide of Zn is an oxide of Zn derived from a Zn₂Mg phase and the blackening is performed by bringing into contact with steam at 50 to 350°C under a low oxygen concentration. There is provided a black plated structural member used for a member for vehicle equipment, a member for frame (floor plate), a member for a container (tank), a building member, a plant member and a facility member, irrespective of shape.;SELECTED DRAWING: None;COPYRIGHT: (C)2018,JPO&INPIT