Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 292, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2022.126831
Keywords
Hydroxyl-terminated poly(amine-ester); Q235 steel; Corrosion inhibitor; Adsorption
Categories
Funding
- National Natural Science Foundation of China
- Shanghai Science and Technology Commission
- [22171085]
- [21ZR1415500]
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In this study, a hydroxyl-terminated poly(amine-ester) hyperbranched polymer (HPAE-OHs) was used as a green, effective and economic corrosion inhibitor for mild steel. The results showed that HPAE-OHs can efficiently inhibit the corrosion of mild steel with a corrosion inhibition efficiency of 94.9% at a dosage of 100 mg/L.
Herein, we reported to use a hydroxyl-terminated poly(amine-ester) hyperbranched polymer (HPAE-OHs) as a green, effective and economic corrosion inhibitor for mild steel (Q235) in 1 M HCl solution. HPAE-OHs is a third generation hyperbranched polymer which can be synthesized through a simple one-pot solvent-free esterifi-cation. Weight-loss tests show that the presence of HPAE-OHs can inhibit the corrosion of Q235 and the corrosion inhibition efficiency (eta (%)) can reach 94.9% at the dosage of 100 mg L-1 for 24 h. The study of the adsorption thermodynamic indicates that the adsorption of HPAE-OHs on the surface of Q235 steel follows Langmuir adsorption isotherm model. Polarization measurements and electrochemical impedance spectroscopy (EIS) suggest that HPAE-OHs works as a mixed-type inhibitor, which forms a layer of protective film on the metal surface to prevent metal corrosion. Moreover, theoretic studies further indicate that the corrosion inhibition is the result of the strong adsorption of HPAE-OHs inhibitor on Q235 steel surface. All these results clearly show that the synthesized hyperbranched polymer HPAE-OHs is an efficient corrosion inhibitor for steel and has a great application potential in industrial metal anticorrosion.
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