Abstract：The ascorbic acid corrosion inhibitor on corrosion properties of Q235 steel in the production wastewater of dibenzoyl methane at 50 ℃ is studied by weight-loss method. The self-corrosion current density, polarization corrosion current density and polarization resistance of corrosion inhibitor film were determined by electrochemical method. The morphology of corrosion inhibitor Q235 steel with and without corrosion inhibitor film is studied by SEM. The result reveals that in the wastewater of 50 ℃, the best dosage of ascorbic acid is 0.100g/L, and the optimal time of the corrosion inhibitor film formed is 24h, and corrosion inhibition efficiency equal to 79%. The self-corrosion current density of Q235 steel is reduced from 5.46×10-5A/cm2 to 3.81×10-8A/cm2, when the corrosion inhibitor membrane is present. When the polarization voltage is 400mV, the polarization corrosion current density decreases from 6.41×10-3A/cm2 to 4.10×10-6A/cm2 , and the polarization impedance increases from 198.6Ω· cm2 to 7546.3Ω· cm2. The SEM test demonstrates that under the electric potential of 0.400V, the Q235 steel without corrosion inhibitor film corrosion is very seriously corroded while the Q235 steel with corrosion inhibitor film is hardly corroded.
2019, Vol. 26 
