Study of corrosion and superhydrophobicity behavior of Nickel- SiO۲ nanocomposite coatings

Nickel- Silica (SiO۲) nanocomposite films with various SiO۲ contents (۰, ۲, ۵ and ۱۰ g/l) were prepared using a nickel watts plating bath. After deposition of nanocomposite coatings, the surface of coatings were treated by silane base composition by self-assemble method.  The nano composite films were characterized by means of XRD, atomic force microscopy (AFM) and scanning electronic microscope. Their water-repellencies were also measured. Corrosion performance of the coatings was examined using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS).  The results show that the Ni-SiO۲ nanocomposite coating has corrosion resistance better than the Ni coating. Also, adding silica nanoparticles ends to increase the roughness and better water repellency. The corrosion current in the nano composite coating with ۱۰ g/l SiO۲ was  ۰.۴ µA/cm۲ and for pure nickel coating was ۲ µA/cm۲.

Keywords:

Ni-SiO۲ nanocomposite coatings , electrochemical performance , Contact angle , superhydrophobicity , پوشش های نانو کامپوزیتی نیکل- سیلیس , رفتار الکتروشیمیایی , زاویه تماس , فوق آبگریزی ,