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제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Perfluorooctyltriethoxysilane Functionalized Graphene Oxide as a Corrosion Inhibitor Coating on AZ-31 Magnesium Alloy

2015년 8월 27일 16시 12분 14초
ELEC.P-537 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 16일 (금요일) 13:00~14:30
저자 및
순천대학교 인쇄전자공학과, India
1순천대학교 인쇄전자공학과, Korea
AZ-31 magnesium alloy is one of the lightest materials which has attracted considerable interest in applications to aerospace and electronics for its excellent properties, such as low density, high ductility, and high specific strength. However, AZ-31 Mg alloy is vulnerable to corrosion under ambient conditions, limiting its widespread usage. Various methods gave been exploited to protect the Mg surface from corrosion. Organic coating which is a very simple and effective method, has also been extensively studied to reach this goal. In some examples, noticeable results by polymer coating have been reported, but there still remains a wide room for further improvement, when compared with commercially utilized chromate coating. In this work, we report the synthesis and corrosion protection of perfluorooctyltriethoxysilane (PFOTS) functionalized GO (PFOTS/GO). A simple one step method was used for the synthesis of PFOTS/GO, which was then chemically reduced to produce PFOTS/reduced GO (PFOTS/rGO). The PFOTS/rGO was coated on the Mg alloy by spin-coating or dip-coating with a dispersion of the same in a suitable organic solvent. The high surface area of rGO provides superior coverage, allowing minimal consumption of PFOTS/rGO for effective coating. The hydrophobic property of the PFOTS/rGO promotes the corrosion inhibition property greatly. In contrast to bare AZ-31 Mg alloy, the PFOTS/rGO-coated AZ-31 Mg alloy exhibited a significant increase of the impedance in the electrochemical impedance spectroscopy and a substantial positive shift of the Ecorr (in 3.5 wt% NaCl solution) in potentiodynamic polarization measurements. Preliminary studies showed that thermally reduced GO-coated AZ-31 Mg alloy to exhibit reasonably good corrosion inhibition behavior. We believe that the synergy between the hydrophobic nature of PFOTS and corrosion inhibition property of rGO can enhance the corrosion inhibition phenomenon. The hydrophobic PFOTS/rGO and simplicity in coating present a practically cost-effective procedure for the efficient corrosion inhibition of AZ-31 Mg alloy in 3.5 wt% NaCl solution.