POSCO. has been granted a patent for a plated steel sheet featuring a base steel sheet, a Zn—Mg—Al plating layer, and an Fe—Al inhibition layer. The plating layer contains 4-10% Mg, 5.1-25% Al, and a MgZn2 phase, enhancing corrosion resistance and material properties. GlobalData’s report on POSCO gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on POSCO, Battery management systems was a key innovation area identified from patents. POSCO's grant share as of July 2024 was 48%. Grant share is based on the ratio of number of grants to total number of patents.
Plated steel sheet with zn—mg—al and fe—al layers
The granted patent US12054829B2 describes a novel plated steel sheet designed to enhance corrosion resistance and durability. The invention features a base steel sheet coated with a Zn—Mg—Al-based plating layer on at least one surface. This plating layer contains specific weight percentages of magnesium (4 to 10%) and aluminum (5.1 to 25%), with the remainder being zinc and unavoidable impurities. A critical aspect of the invention is the inclusion of a Fe—Al-based inhibition layer situated between the base steel sheet and the plating layer. This inhibition layer is composed of an intermetallic compound with less than 10 wt % zinc, specifically selected from Fe2Al5, FeAl3, and FeAl5, and has a thickness ranging from 0.02 to 2 µm.
The claims further detail the structural characteristics of the plating layer, which contains a MgZn2 phase with a phase fraction of 24 to 50 wt %. Additionally, an aluminum single phase is present within the MgZn2 phase, constituting 1 to 30% of the total cross-sectional area. The patent also specifies that the MgZn2 phase may be partially exposed on the surface of the plating layer, with an average circle-equivalent diameter ranging from 5 to 50 µm. The surface roughness of the plating layer is defined to be between 0.5 to 2.0 µm, and the phase fraction of the aluminum single phase relative to the total area of the plating layer is limited to 1 to 15%. These features collectively contribute to the enhanced performance of the plated steel sheet in various applications.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
