A Comprehensive Study on Surface Activity, Scale and Corrosion Inhibition Performance of N1, N1'-(ethane-1, 2- diyl)bis(ethane-1, 2-diaminium) O, O-di(phenyl/p-tolyl) phosphorodithioate

摘要

The scale and corrosion inhibitors, N1, N1'-(ethane-1, 2-diyl)bis(ethane-1, 2-diaminium) O,Odiphenylphosphorodithioate (I-inh) and N1, N1'-(ethane-1, 2-diyl)bis(ethane-1, 2-diaminium) O,O- dip-tolylphosphorodithioate (II-inh) have been successfully synthesized by the reaction of phenol/ pmethylphenol with phosphorus pentasulfide and triethylenetetramine in toluene solution. Meanwhile,the scale inhibition and corrosion inhibition performance of I-inh and II-inh were evaluated in thiswork. The corrosion inhibition evaluated by potentiodynamic polarization and weight loss andmeasurements show that I-inh and II-inh both are mixed-type effective corrosion inhibitors for Q235steel (235QS) corrosion in H2SO4 solution. The scale inhibition efficiency and corrosion inhibitionefficiency increased with I-inh and II-inh concentration increasing. Additionally, these two scale andcorrosion inhibitors can also be used as excellent surfactants, the surface tension of I-inh and II-inh atcritical micelle concentration were 37.64 mN m-1(17.14 mmol L-1) and 35.40 mN m-1(18.03 mmol L1), respectively. The scale inhibition performance of I-inh against CaCO3 and CaSO4 scale are betterthan that of II-inh under the same conditions..