Synthesis and Performance Evaluation of Compound Corrosion Inhibitor for Oil Transmission Station

Abstract

In order to slow down the corrosion of oil transmission station in high salinity environment, the corrosion inhibition effect of four compound corrosion inhibitors on L360 steel in simulated deposit water at the bottom of tank was studied by static weight loss method, dynamic potential polarization curve, electrochemical impedance spectroscopy and metallographic microscope. Results showed that at 50 ℃, these four corrosion inhibitors could all inhibit the corrosion of L360 steel. And when the temperature was increased, the corrosion inhibition efficiencies of corrosion inhibitor 2 and 4 were both higher than 90%, meanwhile, the corrosion inhibition efficiency was less affected by the pressure and rotation speed. The four corrosion inhibitors were all mixed corrosion inhibitors which could inhibit both anode and cathode reactions. According to the Arrhenius formula, it was found that the slopes of the corrosion inhibitor 1 and 3 were changed, indicating that the two corrosion inhibitors were more affected by temperature, while the corrosion inhibitor 2 and 4 were less affected by temperature.

Keywords

• compound corrosion inhibitor|static weight loss method|electrochemical method|mixed corrosion inhibitor|environment|corrosion inhibition efficiency|arrhenius formula