البحوث المنشورة في المجلات العلمية العالمية	رجوع

Improvement the Corrosion Resistance of pure Al, Al-Si and Al-Zn alloys by Nanoalumina Coating

This work involves applying the coating by nanoalumina using atomization technique to improve corrosion resistance of pure Al, Al-Si and Al-Zn alloys. Potentiodynamic polarization method was carried out for uncoated and coated specimens in 3.5% NaCl solution at room temperature. Corrosion parameters were measured to know the protection efficiency obtained for nanocoatings. The data of corrosion indicate that nanoalumina coatings corrosion potentials shift toward active direction and corrosion current densities toward lower values. Good protection efficiency was obtained especially for coated pure Al equal to 80%. Cyclic polarization curves were achieved to know the susceptibility to pitting corrosion, nanocoatings lead to shift forward and reverse scan toward active direction and lower hysteresis loops.