Investigating the Simultaneous Effect of Organic Corrosion Inhibitor and Mesoporous Silica Nanoparticles on the Corrosion Resistance of Electrogalvanized Steels

The main objective of this study is to investigate the effect of co-deposition of mesoporous silica nanoparticles and organic corrosion inhibitor on the corrosion resistance of electrogalvanized steels. For co-deposition of zinc and mesoporous silica nanoparticles (Zn-MSN), different current densities and concentrations of SiO۲ nanoparticles have been tested. The optimum deposition conditions were obtained at (۲۳۵ mA/cm۲) current density and (۰.۵ g/l) concentration of mesoporous silica nanoparticles. The zinc metal acts as a sacrificial anode using cathodic protection and simultaneously mesoporous silica nanoparticles act as a protective layer for the carbon steel substrate. In this study, the electrogalvanization method has been used as an alternative to hot dip galvanization method in order to reduce the coating thickness and solve the heat affected zone problem. Further increase in corrosion resistance has been achieved due to the presence of mesoporous silica nanoparticles (MSN) and organic corrosion inhibitor (MBT). In order to investigate the coating properties, FESEM scanning electron microscopy, XRD X-ray diffraction, Fourier transform infrared spectroscopy (FTIR) and electrochemical studies using electrochemical impedance and potentiodynamic polarization in ۳.۵ wt% NaCl solution with and without of corrosion inhibitors were used. Since the silica nanoparticles in the composite coating act as nucleation sites, the size of zinc crystals in the coating have been reduced and the coating surface has been modified. The electrochemical measurements clearly show that the corrosion resistance of the coating (Zn–۰.۵MSN–MBT) has been increased significantly in the presence of high charge transfer resistance (۱.۸۴۷*۱۰۵(Ωcm۲)), silica nanoparticles (MSN) and organic corrosion inhibitor (MBT).

کلیدواژه ها:

Electro galvanized ، Co-deposition ، Nanoparticles ، Silica ، Nanocomposite ، Corrosion ، Organic inhibitor ، الکتروگالوانیزه- پوشش روی- نانوذرات - سیلیس- نانوکامپوزیت - خوردگی- بازدارنده آلی