Effect of Grain Refinement and Immersion Time on Morphology, Topography and Corrosion Resistance of CCC-Coated 7075 Al Alloy
Autor: | Shirvani, Kourosh, Mastali, Sadegh |
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Zdroj: | Journal of the Electrochemical Society; January 2011, Vol. 159 Issue: 2 pC74-C79, 6p |
Abstrakt: | Chromate conversion coatings (CCCs) were synthesized on AA7075 alloy. The effects of sodium saccharin as a grain refining agent (GRA) and coating time on the coating morphology, topography, and alloy corrosion resistance were studied in this work. Morphologies and topographies of CCCs were examined using optical, scanning electron and atomic force microscopes. The corrosion behaviour was evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy in 0.5 M NaCl solution. Major decreases in both coating grain size and corrosion rate occur at a GRA concentration of 1 g/l. Coating roughness increased to a limited nano-scale extent with increasing immersion time. |
Databáze: | Supplemental Index |
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