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Excellent Seam Weldable Nano-Composite Coated Zn-Ni Plating Steels for Automotive Fuel Tank 원문보기

Corrosion science and technology, v.18 no.1, 2019년, pp.16 - 23  

Jo, Du-Hwan (Automotive Steel Surface Research Group, POSCO Technical Research Laboratories) ,  Yun, Sang-Man (Welding & Joining Research Group, POSCO Technical Research Laboratories) ,  Park, Kee-Cheol (Materials Forming Research Group, POSCO Technical Research Laboratories) ,  Kim, Myung-Soo (Automotive Steel Surface Research Group, POSCO Technical Research Laboratories) ,  Kim, Jong-Sang (PosMAJIC Research Task Force Team, POSCO Technical Research Laboratories)

Abstract AI-Helper 아이콘AI-Helper

Steels for automotive fuel tank require unique properties such as corrosion resistance for fuel, welding for joining, forming for press, and painting for exterior. Recently, automakers have been requiring excellent seam weldable steels to enhance manufacturing productivity of fuel tank. Thus, POSCO ...

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제안 방법

  • Conventional composite coating solutions include corrosion-resistant additives such as silica in polymeric urethane resin solution. In this study, nano-composite coating solutions were prepared by mixing composite resin solution and nano-size conductive materials to improve electrical conductivity by use high speed bead-mill dispersion technology. Although conductive materials are generally higher gravity than non-metallic polymers, their surface tension between the particles is significantly reduced when the 70 nm size of nanomaterial is distributed to organic surfactant by surface modification, thus improving the dispersion stabilization within the solution.
  • However, the importance of friction characteristics is increasing as the high strength steel is recently being applied to fuel tanks to reduce the body weight, and the material formability represented by the plastic anisotropic coefficient is being reduced. The plasticity was evaluated by measuring both the friction coefficient and the limit drawing ratio (LDR). The friction coefficient for the front and the back of the development steels were 0.
  • The fuel dura- bility was evaluated by putting fuel of 30 mL into the drawn cup and then analyzing the corrosion appearance inside the cup and the amount of metal dissolved in the residual fuel after shaking it at 60 rpm in given conditions. (conditions; 1000 hours at 50 °C temperature for gasoline and 8 weeks at 80 °C temperature for diesel) The variety of fuel compositions for test were prepared by using gasoline and diesel fuel, biofuels (bioethanol, biodiesel), corro- sive acid compounds and salts, and evaluated to accelerate corrosion in fuel tanks due to aging.
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참고문헌 (7)

  1. Evaluation of the Corrosion Durability of Steel Systems for Automotive Fuel Tanks, SASFT Report 2002-2004. 

  2. P. Mould, R. Sheffield, and B. Wilkinson, Durability Performance of Fuel-Tank Steels in Bio-Diesel Fuels, SASFT Reprot (2010). 

  3. Y. S. Jin, Proc. 9th Int. Conf. on Zinc and Zinc Alloy Coated Steel Sheet (GALVATECH 2013), pp. 25 - 33, Metallurgical Industry Press, Beijing, China (2013). 

  4. JIS Z 2371, Methods of Salt Spray Testing, Japanese Standards Association (2000). 

  5. ASTM G-115-98, Standard Guide for Measuring and Reporting Friction Coefficients (2004). 

  6. ISO 18594, Resistance Spot, Projection- and Seam-welding-Method for Determining the Transition Resistance on Aluminum and Steel Material (2007). 

  7. W. F. Hosford and R. M. Caddell, Metal Forming Mechanics and Metallurgy, 3rd ed., pp. 220 - 228, Cambridge University Press, New York (2007). 

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