Nucor has been granted a patent for a cathodic corrosion-protection coating for press-hardened steel strips. The coating includes zinc, aluminum, and manganese or antimony, with specific atomic weight ratios of zinc to oxygen in the surface oxides, enhancing the steel’s durability against corrosion. GlobalData’s report on Nucor 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 Nucor, Structure Building Framework was a key innovation area identified from patents. Nucor's grant share as of June 2024 was 55%. Grant share is based on the ratio of number of grants to total number of patents.
Cathodic corrosion-protection coating for press hardened steel
The granted patent US12031215B2 describes a post-hot pressed cathodic corrosion-protection coating specifically designed for sheet steel. The coating is characterized by a surface that includes surface oxides of iron, zinc, aluminum, and manganese. Key to the formulation are specific atomic weight percent ratios among these elements, particularly the ratio of zinc to oxygen, which is maintained between approximately 0.3 and 0.7. Additional claims detail further ratios, such as zinc to aluminum (ranging from 0.8 to 8.0) and aluminum to oxygen (from 0.1 to 0.6), which contribute to the coating's protective properties.
Moreover, the patent outlines the presence of an (alpha) a (Fe, Zn) phase while specifying the absence of a zinc-rich (gamma) G phase. Notably, some claims also include antimony in the surface oxides, maintaining the same critical ratios for zinc to oxygen, zinc to aluminum, and aluminum to oxygen. The inclusion of boron in the steel sheet is mentioned in conjunction with the (alpha) phase, suggesting a potential enhancement in the coating's performance. Overall, the patent provides a detailed composition and structure for a corrosion-protection coating aimed at improving the longevity and durability of sheet steel 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.
