'Method for producing black-plated steel blade, and method for producing black-plated steel blade molded article'

摘要

patent summary: "method for producing black-plated steel blade, and method for producing black-plated steel blade molded article". The present invention relates to a method of producing a black-plated steel blade capable of being darkened in a short period of time and having an excellent ability to maintain a black appearance after processing. As an original blade, the blade used is a zn-coated steel blade containing molten al and mg and has a zn coating layer containing molten al and mg containing al in an amount of 0.1-22.0%. mass, inclusive, and containing mg in an amount of 0,1-1,5% by weight, inclusive. the coating layer is darkened by causing the molten coated steel blade to contact water vapor within a tightly sealed container. When such an action is performed, the oxygen concentration within the tightly sealed container is 13% or less.