Sodium silicate water glass was modified with sodium polyacrylate as the binder, the composite slurry used for high-temperature oxidation-resistant coating was prepared by mixing glass powder with good lubrication properties in the binder. The properties of the modified binder and high-temperature oxidation resistance of Ti-6Al-4V titanium alloy coated with composite glass coating were studied by XRD, SEM, EDS, TG-DSC and so on. Results showed that sodium polyacrylate modified water glass could obviously improve the suspension stability of the binder, the pyrolytic carbon in the binder at high temperature could increase the surface tension in the molten glass system, and the composite glass coating could be smooth and dense after heating. Pyrolytic carbon diffused and combined with oxygen in the coating under the heating process to protect the titanium alloy from oxidation. The thickness of the oxide layer was reduced 51% after applying the high-temperature oxidation-resistant coating. The coating also showed a nearly 30% reduction in friction coefficient due to the boundary lubricant regime. During cooling, the coating could be peeled off easily because of the mismatched CTE between the coating and substrate.

Heavy-metal pollution (such as Cd(II)) is regarded as a serious environmental problem, posing a great threat to human beings. In this research, a novel water-dispersible magnetic alginate/hydroxyapatite composite with high-efficiency Cd(II) adsorption performance was successfully synthesized by a facile wet-chemical method. The magnetic separation experiment and magnetic property analysis indicate that a magnetic alginate/hydroxyapatite composite can be effectively separated under a magnetic field. The zeta-potential result and dispersity experiment indicate that the lowest zeta-potential is –39.4 mV at pH = 5, and the obtained sample dispersed well in a Cd(II) solution after 120 min. The maximum adsorption capacity of a sample on Cd(II) is 135.3 mg g–1 at pH = 5, and the adsorption of Cd(II) reached equilibrium in 10 min. The adsorption data could be fitted well using the Langmuir model, and the adsorption kinetic follows a pseudo-second-order kinetic model.