Effect of Citric Acid on Cerium Conversion Coating of Hot-Dip Galvanized Steel

Cerium conversion coatings were obtained by immersing hot-dip galvanized steel (HDG) sheets in a cerous nitrate solution. The surface morphologies were observed with scanning electron microscopy. The composition of the coating were determined with X-ray energy dispersive spectrometer and X-ray photoelectron spectroscopy. The results showed that the modified cerium conversion coating grows more quickly than that of common cerium conversion coating. Potentiodynamic polarization and electrochemical impedance spectroscopy measurements revealed that the corrosion resistance of the modified cerium conversion coating was superior to that of common cerium conversion coating and was comparable to that of the conventional chromate passivation coating.

Preparation and Performance of Zinc Zeolite-Ce/TiO2 Antibacterial Material

Zinc zeolite-Ce/ TiO2antibacterial material was prepared through immersion method with anatase nano- TiO2power as main raw materials, zinc zeolite as carrier and cerium ions as doping ions. Its antibacterial function was evaluated by detecting the inhibition zone, the light-catalyzed effect of pure TiO2antibacterial material was contrasted with zinc zeolite-Ce/ TiO2antibacterial material by using ultraviolet spectrum. The results showed that zinc zeolite-Ce/ TiO2antibacterial material had strong bacteriostasis to escherichia coli. It performed best when the diameter of inhibition zone reached to 34.64 mm under the condition of the ratio of nano-TiO2to cerous nitrate was 40:1, the reacting time was half an hour, the maturing temperature was 300°Cand pH value was equal to 3.

The Mechanism of Antibacterial Activity of Copper and Cerium-Loaded White Carbon Black

This paper investigated the antibacterial mechanism of the Cu-antibacterial White Carbon Black containing cerium. The sol-gel method was used to prepare the White Carbon Black carrier. Cu2+ was selected to be the antibacterial ion, and cerous nitrate was selected to be the additive. They were synthesized on the white carbon black carrier. The structure and antibacterial mechanism of antibacterial material were characterized by inductively coupled plasma, Fourier transform infrared spectroscopy and enumeration tests (Escherichia coli as experimental bacterium). Results showed that the contents of antibacterial ions in the Cu-antibacterial white carbon black containing cerium were higher than those for the general Cu-antibacterial white carbon black (without containing cerium). Cu2+ was bound to white carbon black by ion exchange process. Bacteriostasis rate is over 99%. Furthermore, other advantages of this material are its good thermal and light stabilities.