Abstract
A low temperature zinc phosphating processing accelerated by an eco friendly nano ZrO2 and nano ZnO is developed. The effects of nano ZrO2 on the nano zinc phosphating of mild steel were studied by Scanning Electron Microscopy (SEM),X-ray Diffraction(XRD), Transmission Electron Microscopy(TEM) and Electrochemical measurements. Results showed that the addition of nano ZrO2 of varying concentration from 0.5 to 3 g/L in the phosphating bath has larger influence on the phosphate coating weight and the corrosion resistance of the coatings. Nano ZrO2 was adsorbed on the coating, increases the number of nucleation sites, refined the grain size and accelerated the precipitation of phosphates. Addition of nano ZrO2 in the phosphating bath decreased the corrosion current density and increased the corrosion resistance of the coatings. Better corrosion resistance was observed for coatings derived from phosphating baths containing 1.0 to 1.5g/L of nano ZrO2.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
