Evaluation of the anticorrosion of waterborne epoxy coatings containing cerium salt-activated ceria nanoparticles deposited onto carbon steel substrates

The presence work investigates the corrosion protection of waterborne epoxy coatings containing CeO2 nanoparticles activated with cerium salt for the carbon steel substrates. First, the dispersion of activated nanoparticles in the epoxy matrix was observed by field emission scanning electron microscopy (FESEM). The electrochemical impedance spectroscopy (EIS) was carried out to evaluate the role of the activated-CeO2 nanoparticles in the organic coatings immersed in a 0.5 M NaCl solution. Thus, the effect of the cerium ion activated ceria nanoparticles on the coatings presented the artificial defect in the aggressive environment was examined via salt spray test. Complementary studies were performed using the cross-cut and pull-off test to assess the adherence properties of the samples. Results revealed that the presence of activated-CeO2 nanoparticles enhanced corrosion protection properties of waterborne epoxy coating without losing adherence properties.

Investigation on the Compound Phosphate Film Formed in Bath with Cerium Salts on the Magnesium Aluminum Alloy

A composite phosphate film was formed on magnesium aluminum (Mg-Al) alloy which was impregnated in phosphating solution containing phosphate, cerium salt, organic ammonium and corrosion inhibitor. The sample was examined by scanning electron microscope (SEM), X-ray diffraction (XRD), and Energy Dispersive Spectrometer (EDS) to analyze the organization and structure of the film. Additionally, the corrosion resistance of the film of composite phosphate was also investigated by salt spray test. As a result, it shows that the components of the film formed on Mg-Al alloy contain phosphates and elemental zinc. On the other hand, the composite phosphate film possessing photo-absorption property can be used for protective layer and laser pretreatment of Mg-Al alloy.