The influence of nano Al2O3 on the development and protection behavior of nano zinc phosphate coatings on mild steel

By incorporating nano Al2O3 and nano ZnO in the phosphating bath, novel low temperature zinc phosphate conversion coatings were developed on mild steel. The morphology, composition, growth process and the corrosion resistance of the coatings developed were investigated by Open Circuit Potential (OCP), Scanning Electron Microscopy (SEM), Energy-dispersive X-ray Spectroscopy (EDX), Transmission Electron Microscopy(TEM),X-ray Diffraction(XRD), and Electrochemical measurements. Significant variation in the coating weight, morphology and corrosion resistance was observed as nano Al2O3 concentrations varied from 03 g/L in the phosphating bath. Despite the fact that a relatively thin coating is formed with the presence of nano Al2O3 than without it, the phosphate coatings showed better protection performance in 3.5% NaCl solution. Based on the results, the amount of nano Al2O3 into the phosphating bath was optimized as 1g/L.

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