Effect of CTAB surfactant on microstructure and oxidation behavior of Ni-TiO۲ Composite coating

Surface modification is very important in the component in industry due to wear and corrosion. In order to improve the corrosion behavior of steels, a protective coating can be deposited onto the surface. In this study Ni-TiO۲ coatings were prepared on an AISI ۴۳۰ stainless steel substrate by electrocodeposition process in Watt’s plating bath containing TiO۲ particles. Two types of coatings was produced; without CTAB and at presence of CTAB surfactant. Isothermal oxidation behavior of uncoated and two types of coated specimens were studied up to ۲۵۰ h in ۸۰۰ ºC. Also cyclic oxidation was studied for ۱۰۰ cycles at ۸۰۰ C. Scanning electron microscope (SEM) and X-ray systems were applied in order to investigate the formed phases and structures of composite coating before and after oxidation. Results showed coated specimens at presence of CTAB surfactant had lower mass gain compared to Ni-TiO۲ coated and uncoated ones after isothermal and cyclic oxidation at ۸۰۰ ºC.

Keywords:

Electrodepoistion , Oxidation , Ni-TiO۲ coating , CTAB