Plated steel material and method for manufacturing the same
A plated steel material with a controlled aluminum, magnesium, and zinc composition and multilayer Zn phase structure addresses corrosion and crack issues, ensuring high corrosion resistance and crack resistance in processed areas.
JP2026520353APending Publication Date: 2026-06-23HYUNDAE STEEL CO LTD
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- HYUNDAE STEEL CO LTD
- Filing Date
- 2024-05-14
- Publication Date
- 2026-06-23
AI Technical Summary
Technical Problem
Conventional plated steel materials face issues with decreased sacrificial anode efficiency due to magnesium oxidation, leading to reduced corrosion resistance and increased crack formation in processed areas, especially when magnesium content is high.
Method used
A method involving a plating process with a specific composition of aluminum, magnesium, and zinc, followed by controlled cooling to form a multilayer primary Zn phase structure, minimizing crack propagation and enhancing corrosion resistance.
Benefits of technology
The method results in a plated steel material with excellent corrosion resistance and crack resistance in processed areas, achieving a red rust formation time of 1100 hours or more in a salt spray test.
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Smart Images
Figure 2026520353000001_ABST
Abstract
The plated steel material of the present invention comprises a base iron and a plating layer formed on the base iron, the plating layer comprising aluminum (Al): 1-3% by weight, magnesium (Mg): 1-2% by weight, and the remainder being zinc (Zn) and other unavoidable impurities, wherein the weight ratio of aluminum to magnesium in the plating layer is 1.2 or more, the plating layer comprises a primary Zn phase structure and a eutectic phase structure, the primary Zn phase structure has a multilayer structure in the height direction of the plating layer, the area fraction of the primary Zn phase structure having the multilayer structure in the plating layer is 30% or more, and the thickness of the plating layer is 15 μm to 50 μm.
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