Narrow Results

The zinc phosphate nanocrystals were synthesized by the ultrasonic–hydrothermal synergistic route. The ultrasonic–hydrothermal synergistic route can not only decrease the size of the zinc phosphate material, but also improve the crystallinity of the product. The transmission electron microscopy (TEM) image showed that the needle-like zinc phosphate product was 200–300 nm in length and 70–80 nm in width. The anti-corrosion tests revealed that the salt atmosphere-resistant time about 1056 h was longer than 768 h common zinc phosphate materials in the market. The mechanisms of ultrasonic–hydrothermal synergistic route and anti-corrosion were discussed.

Zinc phosphate, and zinc molybdate nanoparticles were prepared from inverse microemulsions of inorganic salts stabilized by a mixture of nonionic and ionic surfactants in cyclohexane. The optimal ratios of surfactants to inorganic salts were found experimentally. The resulting nanoparticles were characterized by transmission electron microscopy, scanning electron microscopy, and X-ray diffraction. These nanoparticles were then mixed to epoxy formulations, which were applied to steel coupons. After accelerated aging, the electrochemical characteristics of the corrosion were analyzed by electrochemical impedance spectroscopy. The nanoparticles increase the corrosion resistance of the coating, indicating that the use of zinc phosphate and zinc molybdate nanoparticles offer a promising route for the mitigation of steel corrosion.