Research on performance of Mannich bases and its combined corrosion inhibitor

The inhibition effect of three kinds of single corrosion inhibitor: Mannich bases, thiourea, and sodium tungstate, and binary combinations of Mannich bases to 10# carbon steel in the simulated corrosive liquid using the CMB-4510A inhibitor rapid assessment instrument were studied. For high-acid and high-chloride crude oil, adding corrosion inhibitors are the most effective method of preventing corrosion of carbon steel. The results show that when the temperature is 50℃, pH6.0, Mannich bases, thiourea, sodium tungstate is used individually in the corrosive liquid have a certain effect of corrosion inhibition on 10# carbon steel, in which Mannich bases andsodium tungstate is superior to thiourea; the inhibition effects of binary combinations of Mannich bases compounded with thiourea and sodium tungstate are better than that of threeinhibitors while used alone.