One of the main problems of stainless steel is its poor pitting corrosion resistance in the aggressive environment containing Cl-,such as seawater.In this paper we investigated the corrosion behavior of the 316 stainless steel coated by cerium oxide nanocoating prepared by sol-gel process.Potentiodynamic polarization and electrochemical impedance spectroscopy(EIS)were used to study the corrosion behavior of cerium oxide nanocoatings in 3.5% NaCl solution.The microstructure of the cerium oxide was examined by scanning electron microscopy(SEM)and the formed phases was identified by X-ray diffraction(XRD).The pitting corrosion resistance of the cerium oxide nanocoating was found to be improved after heat treatment of the cerium oxide nanocoating at 300℃for 30 min.
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