Surface-treated metal sheet and automotive member comprising same

A surface-treated metal sheet with a coating film of doped oxide particles and Si-containing compound, optimized at an A/B ratio of 2.80 to 6.00, addresses corrosion and weldability issues in continuous spot welding, ensuring effective electrode performance and defect prevention.

WO2026127066A1 Publication Date: 2026-06-18NIPPON STEEL CORPORATION
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
NIPPON STEEL CORPORATION
Filing Date
2025-12-10
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Surface-treated metal sheets used in automobiles face challenges in maintaining corrosion resistance and weldability during continuous spot welding due to deformation of the welding electrode tip, leading to insufficient pressure and welding defects.

⚗Method used

A surface-treated metal sheet with a coating film containing doped oxide particles, a rust-preventive pigment with a Si-containing compound, and a controlled ratio of doped oxide particles to Si-containing compound (A/B ratio of 2.80 to 6.00) to enhance corrosion resistance and weldability.

🎯Benefits of technology

The solution provides excellent corrosion resistance and weldability in continuous spot welding by controlling the A/B ratio, preventing electrode deformation and ensuring a conductive path while maintaining coating film deformability.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention provides a surface-treated metal sheet having excellent corrosion resistance while also having excellent weldability for continuous spot welding, and an automotive member comprising the same. Provided are: a surface-treated metal sheet comprising a metal sheet and a coating film having a thickness of 0.5 to 5.0 μm disposed on the surface of the metal sheet, wherein the coating film contains doped oxide particles, an anti-corrosion pigment, and a binder resin, the anti-corrosion pigment contains a Si-containing compound, and the ratio (A / B) of the amount (vol%) (A) of the doped oxide particles to the amount (vol%) (B) of the Si-containing compound is 2.80 to 6.00; and an automotive member comprising the same.
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