Effect of molecular weight on inhibition performance of modified polyethyleneimine as polymer corrosion inhibitor for carbon steel in neutral medium
Compared with small organic molecular, polymer corrosion inhibitors exhibit better anti‐corrosion performance in neutral medium because of multiple adsorption sites and temperature toleration, which are becoming the focus of scholars in the field of water treatment. However, the effect of molecular...
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| Published in: | Journal of applied polymer science Vol. 139; no. 15 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
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Hoboken, USA
John Wiley & Sons, Inc
15-04-2022
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| Abstract | Compared with small organic molecular, polymer corrosion inhibitors exhibit better anti‐corrosion performance in neutral medium because of multiple adsorption sites and temperature toleration, which are becoming the focus of scholars in the field of water treatment. However, the effect of molecular weight of polymer inhibitors is rarely studied, which has a significant impact on its performance. Polyethyleneimine (PEI) containing polar groups and numerous N atoms is a kind of water‐soluble polymer which is prone to being modified, and three kinds of modified polyethyleneimine (PEPA) inhibitors are synthesized by PEI with different molecular weights (600, 1800, 10,000) in this work. The anti‐corrosion performance of PEPA for Q235 carbon steel in neutral medium was evaluated by electrochemical measurements (Tafel polarization plots and electrochemical impendence spectroscopy [EIS]), weight‐loss tests, and surface morphology analysis. Results of weight loss method and other measurements confirm that PEPA is an excellent polymer inhibitor, and the inhibition performance of PEPA synthesized by PEI with molecular weight of 1800 is the best with an inhibition efficiency of 94.6% at a dosage of 200 mg/L at 298 K in neutral medium.
Effect of molecular weight on corrosion inhibition performance of PEPA. |
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| AbstractList | Abstract
Compared with small organic molecular, polymer corrosion inhibitors exhibit better anti‐corrosion performance in neutral medium because of multiple adsorption sites and temperature toleration, which are becoming the focus of scholars in the field of water treatment. However, the effect of molecular weight of polymer inhibitors is rarely studied, which has a significant impact on its performance. Polyethyleneimine (PEI) containing polar groups and numerous N atoms is a kind of water‐soluble polymer which is prone to being modified, and three kinds of modified polyethyleneimine (PEPA) inhibitors are synthesized by PEI with different molecular weights (600, 1800, 10,000) in this work. The anti‐corrosion performance of PEPA for Q235 carbon steel in neutral medium was evaluated by electrochemical measurements (Tafel polarization plots and electrochemical impendence spectroscopy [EIS]), weight‐loss tests, and surface morphology analysis. Results of weight loss method and other measurements confirm that PEPA is an excellent polymer inhibitor, and the inhibition performance of PEPA synthesized by PEI with molecular weight of 1800 is the best with an inhibition efficiency of 94.6% at a dosage of 200 mg/L at 298 K in neutral medium. Compared with small organic molecular, polymer corrosion inhibitors exhibit better anti‐corrosion performance in neutral medium because of multiple adsorption sites and temperature toleration, which are becoming the focus of scholars in the field of water treatment. However, the effect of molecular weight of polymer inhibitors is rarely studied, which has a significant impact on its performance. Polyethyleneimine (PEI) containing polar groups and numerous N atoms is a kind of water‐soluble polymer which is prone to being modified, and three kinds of modified polyethyleneimine (PEPA) inhibitors are synthesized by PEI with different molecular weights (600, 1800, 10,000) in this work. The anti‐corrosion performance of PEPA for Q235 carbon steel in neutral medium was evaluated by electrochemical measurements (Tafel polarization plots and electrochemical impendence spectroscopy [EIS]), weight‐loss tests, and surface morphology analysis. Results of weight loss method and other measurements confirm that PEPA is an excellent polymer inhibitor, and the inhibition performance of PEPA synthesized by PEI with molecular weight of 1800 is the best with an inhibition efficiency of 94.6% at a dosage of 200 mg/L at 298 K in neutral medium. Effect of molecular weight on corrosion inhibition performance of PEPA. Compared with small organic molecular, polymer corrosion inhibitors exhibit better anti‐corrosion performance in neutral medium because of multiple adsorption sites and temperature toleration, which are becoming the focus of scholars in the field of water treatment. However, the effect of molecular weight of polymer inhibitors is rarely studied, which has a significant impact on its performance. Polyethyleneimine (PEI) containing polar groups and numerous N atoms is a kind of water‐soluble polymer which is prone to being modified, and three kinds of modified polyethyleneimine (PEPA) inhibitors are synthesized by PEI with different molecular weights (600, 1800, 10,000) in this work. The anti‐corrosion performance of PEPA for Q235 carbon steel in neutral medium was evaluated by electrochemical measurements (Tafel polarization plots and electrochemical impendence spectroscopy [EIS]), weight‐loss tests, and surface morphology analysis. Results of weight loss method and other measurements confirm that PEPA is an excellent polymer inhibitor, and the inhibition performance of PEPA synthesized by PEI with molecular weight of 1800 is the best with an inhibition efficiency of 94.6% at a dosage of 200 mg/L at 298 K in neutral medium. |
| Author | Fu, Chaoyang Chen, Tianqi Chen, Mengjin |
| Author_xml | – sequence: 1 givenname: Tianqi orcidid: 0000-0003-3839-3164 surname: Chen fullname: Chen, Tianqi organization: Huazhong University of Science and Technology – sequence: 2 givenname: Mengjin surname: Chen fullname: Chen, Mengjin organization: Huazhong University of Science and Technology – sequence: 3 givenname: Chaoyang surname: Fu fullname: Fu, Chaoyang email: cyfu@hust.edu.cn organization: Huazhong University of Science and Technology |
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| SubjectTerms | Carbon steel Carbon steels Chemical synthesis Corrosion Corrosion inhibitors electrochemical measurements Electrode polarization Killed steels Materials science Molecular weight Organic chemistry Polyethyleneimine polymer corrosion inhibitor Polymers Q235 carbon steel Water treatment Weight loss measurement |
| Title | Effect of molecular weight on inhibition performance of modified polyethyleneimine as polymer corrosion inhibitor for carbon steel in neutral medium |
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