Study on corrosion inhibition properties of polyurethane surfactants on steel in hydrochloric acid solution
In order to solve the corrosion problem of carbon steel under acidic conditions,three kinds of polyurethane surfactants were synthesized and used as corrosion inhibitors.Potentiodynamic polariza-tion curve,electrochemical impedance spectroscopy(EIS)and scanning electron microscopy(SEM)were used to study the effect of corrosion inhibitors on the corrosion degree of carbon steel in 1.0 mol·L-1 HCl solution.The corrosion inhibition efficiency of polyurethane surfactants was compared under different types and concentrations.The results showed that polyurethane surfactants were mixed inhibitors with good corrosion inhibition performance.The inhibition efficiency was SC2>SC3>SC4,and the maximum inhibition rate can reach 91.1%when the concentration of SC2 was 1×10-3 mol·L-1 HCl,and the inhibition efficiency increased with the increase of the concentration of the inhibi-tor.The SEM results further confirmed that the above surfactants effectively slowed down the corrosion of carbon steel surface.
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