Performance Study of Ketoaldoamine Condensate Corrosion Inhibitor / Waterborne Polyurethane Composite Film

Abstract

To address the corrosion problem of Q235 steel pipes for oilfield water injection，waterborne polyurethane (WPU) emulsions were modified with ketoaldoamine condensate corrosion inhibitors to endow their composite films (or coatings) with both corrosion inhibition and barrier effects on corrosive ions.Meanwhile，the relevant analysis and characterization were carried out using infrared spectrometer，thermogravimetric analyzer，electrochemical workstation and other means.Results showed that the addition of corrosion inhibitor formed a large number of hydrogen bonds and intermolecular forces between the waterbased polyurethane，and the presence of a large number of benzene rings could improve the thermal stability of the composite membrane.Compared with the pure WPU film，the hardness of WPU-3 and WPU-5 composite film could reach 2 H.When the amount of corrosion inhibitor added was 3%，compared with the original unmodified situation，the contact angle of as-prepared film increased 59.69° to 74.74°，the hydrophobicity was improved，and the impedance of the coating reached the maximum value.Thus，the as-prepared composite film had the best electrochemical performance and the optimal corrosion resistance.

Keywords

• ketoaldoamine corrosion inhibitor|waterborne polyurethane|composite films|oilfield water injection|anticorrosive