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2015 | 128 | 2B | B-90-B-92
Article title

Improvement of Oxidation Resistance of Mild Steel by SiO₂-Al₂O₃ Sol Gel Coating

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SiO₂-Al₂O₃ sol gel coating solution was used for coating of mild steel substrate by dip coating technique with withdrawing speeds of 250, 500, 750 and 1000 mm/min. The coatings were subsequently heat treated at 200°C for 1 hour in order to improve their corrosion resistance properties. The coating sol was synthesised using Glycidoxypropyltrimethoxysilane (C₉H₂₀O₅Si) and Aluminium triisopropylate (C₉H₂₁O₃Al). The corrosion resistance of the both coated and uncoated samples was evaluated by the Tafel polarization in NaCl solution. Fourier transformed infrared (FTIR) and energy dispersive spectroscopy (EDS) analyses were used to identify the presence of various functional groups in the coating solution. A comparison of the corrosion resistance of the coated and uncoated mild steel is presented. Variation of corrosion potential (E_{corr}) has increased and corrosion current density (i_{corr}) has decreased in the coated samples. i_{corr} values of coated specimens, heat treated at 200°C, were 12 to 14 times smaller than those of uncoated specimen. The measured electrochemical parameters indicate that the corrosion resistance was improved by the coating.
  • Istanbul University, Engineering Faculty, Department of Metallurgical and Materials Eng., 34320 Avcilar-Istanbul, Turkey
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