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Four triazine mantic acid derivative additives were synthesized, and their tribological properties in rapeseed oil (RSO) were investigated with a four-ball tester. The results showed that the emulsions prepared with thiotriazine derivatives had excellent tribological properties. For the same S content, the antiwear performance was enhanced by increasing the carbon chain length at low load and deduced by increasing the carbon chain length at high load. The superior antiwear performance was attributed to forming the organic sulfide and nitrogen adhering layer, moreover, under low load, the thiotriazine xanthate derivatives containing a longer substituent chain would be hardly damaged during sliding, and the branch chain on the substituent group would be beneficial to enhance the tribological properties of triazine xanthine derivatives. Sulfur-containing triazine derivatives have a good corrosion inhibition effect for Q235 steel because they contain N, O, S, and other active sites. These heteroatoms have unshared lone pair electrons, which can coordinate with the unoccupied orbital of Fe atoms to form covalent bonds and prohibit the corrosive media from contacting the surface of the Q235 steel, thus inhibiting the corrosion processes. [ABSTRACT FROM AUTHOR]

Carbon dots (CDs) are spherical zero-dimensional carbon nanomaterials, generally below 10 nm in size, which have received increasing attention in the field of corrosion because of various advantages such as good water solubility, abundant raw materials, and environmental protection. In this work, water-soluble carbon dots (CDs) with particle sizes of 5–10 nm are obtained by electrochemical oxidation with anhydrous ethanol. FTIR, Raman, UV–Vis, XPS, and TEM are used to characterize the obtained CDs, and electrochemical tests are used to investigate the anti-corrosion performance of the CDs. The results reveal that the corrosion inhibition performance increased with the addition of CDs, and the highest corrosion inhibition efficiency reaches 98% when the addition amount is 200 mg/L. Moreover, the inhibition mechanism for CDs needs to be further investigated, and the stable adsorption of CDs on carbon steel to form adsorption film may be the key factor for its good corrosion inhibition performance. [ABSTRACT FROM AUTHOR]