Ureidopyrimidinone-containing Poly(amino ester) for corrosion inhibition of mild steel in acidic medium

• Published in: Materials chemistry and physics Vol. 292; p. 126818
• Main Authors: Liu, Wenjing, Zhang, Xin, Qiang, Yujie, Lu, Guangming, Lan, Xijian, Chen, Bin, Zhao, Haichao
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2022
• Subjects: Adsorption; Corrosion inhibitor; Hydrochloric acid medium; Pyrimidinone; Q235 steel; Q235 steel; Pyrimidinone; Adsorption; Hydrochloric acid medium; Corrosion inhibitor
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2022.126818

Ureidopyrimidinone-containing Poly(amino ester) (UPy-D400-PEGDA) was synthesized by the Michael addition reaction of Poly(ethylene glycol) diacrylate and polyether amine grafted 2-ureido-4[1H]-pyrimidinone motifs, and its corrosion inhibition efficiency on Q235 steel in 1 mol/L HCl medium was studied by polarization curve and electrochemical impedance spectroscopy, as well as corrosion product analysis. UPy-D400-PEGDA is a mixed-typed corrosion inhibitor that mainly suppressed the cathode, can form a protective film on the surface of mild steel to suppress the corrosion of oxygen and chlorine in acid medium. Corrosion inhibition efficiency was gradually enhanced with the increase of the concentration of UPy-D400-PEGDA. The corrosion inhibition efficiency reaches 98.80% when the inhibitor concentration is 500 mg/L. The surface roughness of mild steel in 1 mol/L HCl solution without UPy-D400-PEGDA was 3.891 μm, while the roughness of mild steel with UPy-D400-PEGDA concentration of 500 mg/L was only 0.636 μm. The inhibition mechanism was elucidated using quantum chemical calculation. •Corrosion of Q235 carbon steel in 1 M HCl solution is inhibited significantly by UPy-D400-PEGDA.•The order of inhibition ability obtained from EIS is agreement with the polarization results.•The adsorption of UPy-D400-PEGDA involves chemisorption.•Theoretical calculations provide a deeper understanding of the inhibition mechanism.