SUBSTRATE FOR HYDROGEN EQUIPMENT AND METHOD FOR MANUFACTURING SAME

摘要

Provided is a substrate for use in hydrogen equipment in which steel, which is affected by hydrogen when used alone, is hot-dip plated with an aluminum-tin-based aluminum alloy with an added tin quantity of 1-5%, forming a coating resistant to hydrogen penetration that has a three-layer structure, formed by layering an aluminum-based intermetallic compound layer, an aluminum layer, and an alumina layer in this order onto the surface of the steel, with the thickness of the aluminum-based intermetallic compound layer being 1-22 µm and the mean thickness of the coating being less than 35 µm. The steel that serves as the matrix for this coating is a steel that is affected by hydrogen, such as carbon steel, low-alloy steel, ferrite-based stainless steel, martensite-based stainless steel, or the like. When used as a substrate for use in hydrogen equipment used in high-pressure hydrogen environments, this substrate can prevent hydrogen embrittlement, increase durability, and keep production costs low.