Effect of heat treatment on pitting corrosion resistance of 6061 Al/SiCP composite coated by the cerium oxide film in 3.5 N NaCl solution
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Date
2011
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Abstract
One of the main drawbacks of 6061 Al/SiC<inf>P</inf> composite is its poor pitting corrosion resistance in the aggressive environment containing chloride ions, such as seawater, for example. The present article deals with the investigations of effects of aging on the corrosion behavior of 6061 Al/SiC<inf>P</inf> composite and of the heat treatment on the pitting corrosion resistance of 6061 Al/SiC<inf>P</inf> composite coated by cerium oxide prepared by chemical bath technique. Potentiodynamic polarization test was used to study the corrosion behavior of cerium oxide coatings in 3. 5N NaCl solution. The microstructure of cerium oxide was examined by scanning electron microscopy (SEM) and the formed phases were identified by X-ray diffraction (XRD). The pitting corrosion resistance of the cerium oxide coating was found to be improved after heat treatment at 300°C for 30 min. © 2011 Allerton Press, Inc.
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Keywords
After-heat treatment, Aggressive environment, Cerium oxides, Chemical bath, Chloride ions, Corrosion behavior, NaCl solution, Pitting corrosion resistance, Potentiodynamic polarization tests, SEM, Behavioral research, Cerium, Cerium compounds, Corrosion resistance, Corrosive effects, Heat resistance, Heat treatment, Oxide films, Oxides, Protective coatings, Scanning electron microscopy, Seawater effects, Sodium chloride, X ray diffraction, Pitting
Citation
Surface Engineering and Applied Electrochemistry, 2011, 47, 2, pp. 176-180