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http://dx.doi.org/10.14773/cst.2020.19.2.57

Corrosion Resistance of Mg-Added Galvannealed Steel Sheets with Nano-Composite Coating  

Jo, Du-Hwan (Automotive Steel Surface Research Group, POSCO Technical Research Laboratories)
Yun, Sang-Man (Welding & Joining Research Group, POSCO Technical Research Laboratories)
Paik, Doo-Jin (AHSS Steel Quality Management Section, POSCO Gwangyang Works)
Kim, Myung-Soo (Automotive Steel Surface Research Group, POSCO Technical Research Laboratories)
Hong, Moon-Hi (Steel Solution Center, POSCO Coated & Color Steel Co. Ltd)
Publication Information
Corrosion Science and Technology / v.19, no.2, 2020 , pp. 57-65 More about this Journal
Abstract
As competition among global automakers intensifies, demand for materials that are better in price and performance is increasing. While steel and plastic materials compete for automotive fuel tanks, plastic materials have advantages such as light weight for automobiles. However, they have high prices. Accordingly, in this paper, four types of Zn-X plated steel sheets, electroplating (X = none, Sn) and galvannealed (X = Fe, Fe-Mg), were manufactured and their applicability as a fuel tank material was evaluated. Nano-composite coating solution with good conductivity was treated on the surface of plated steels using a roll coater and then cured through induction furnace to improve corrosion resistance. Quality characteristics such as corrosion resistance, fuel resistance to diverse gasoline and diesel fuels, and seam weldability were evaluated for the above plated steels. Their properties were compared and analyzed with conventional Zn-Ni electroplating steels. Among the above plated steels, Zn-Fe-Mg galvannealed steels coated with nano-composite coating exhibited better properties than other steels. Detailed experimental results suggest that evenly distributed Mg elements on the coating layer play a key role in the enhanced quality performance.
Keywords
Galvannealed steel; Corrosion resistance; Fuel tank; Automotive steel;
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