Abstract: Objective To study the effect of saline storage solution with different concentrations on carbon accumulation of pure titanium surface. Methods The pure titanium samples were prepared through grinding and polishing step by step using SiC sandpapers. After cleaning and drying, samples were respectively stored in air, double distilled water, 0.45 % NaCl, 0.9 % NaCl and 10 % NaCl solutions for two weeks. Scanning electron microscopy (SEM), optical contact angle instrument and X-ray photoelectron spectroscopy (XPS) were used to compare and analyze surface micro-morphology, contact angle, surface energy and chemical element composition of titanium samples under different storage conditions. Results SEM observation showed that the titanium surfaces in the control group (air, double distilled water) were relatively clean, whereas sodium chloride crystals scattered on the titanium surfaces in three saline storage solution experimental groups. However, no obvious differences in the micro-morphology of titanium surfaces were observed among different groups. After titanium samples were stored with salt solutions, their surface contact angle decreased while surface energy increased, indicating that the hydrophilicity enhanced. XPS analysis demonstrated that the carbon content on titanium surfaces of the saline storage solution experimental groups decreased significantly compared with the control group, and the higher the concentration of the saline storage solution was, the less the carbon content was. Conclusion Saline storage solution can reduce carbon accumulation on the titanium surface, maintain its hydrophilicity, and have superior anti-aging effect.

Key words: Saline storage solution, titanium, Carbon accumulation, anti-aging