Synthesis of hydrazide derivatives and study their application as corrosion inhibitors for carbon steel in acidic solution

摘要

The inhibition efficiency of two novels ethoxylated (10 and 20 ethylene oxide units) streayl hydrazides against corrosion of carbon steel in 1 M HCl was investigated at different temperature ranges (25 – 55 ºC) by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization methods. The carbon steel surface morphology was investigated by scanning electron microscopy (SEM). The obtained results showed that the prepared inhibitors have good inhibition in 1 M HCl, and the inhibition efficiency increases with the inhibitor concentration at 25 ºC. At 600 ppm the corrosion rates increase with increasing the temperature. Polarization curves show that the inhibitors in hydrochloric acid act as mixed type inhibitors.