Study on Scale and Corrosion Inhibition Performance of Ethane-1,2-diaminium O,O'-dicyclohexyldithiophosphate

Ethane-1,2-diaminium O,O′-dicyclohexyldithiophosphate (Et-DDD) as novel corrosion and scale inhibitor was successfully synthesized by cyclohexanol (C 6 H 11 OH) reaction with phosphorus pentasulfide (P 2 S 5 ) and ethylenediamine (H 2 NCH 2 CH 2 NH 2 ) in toluene (PhCH 3 ), while the corrosion and scale inhibition performance of Et-DDD were studied and evaluated in detailed. Study results show that Et-DDD is a mixed-type inhibitor for Q235 steel (S235) in H 2 SO 4 and HCl solution. It can be found that the scale inhibition and corrosion inhibition efficiency increased with Et-DDD concentration increasing. Meanwhile, the scale and corrosion inhibitor also can be act as a surfactant, the surface tension of Et-DDD at critical micelle concentration of 14.15 mmol L -1 is 33.47 mN m -1 .