4.4 Article

Polyacrylamide as a corrosion inhibitor for mild steel in 2 M phosphoric acid: experimental and theoretical studies

Journal

CHEMICAL PAPERS
Volume 75, Issue 10, Pages 5375-5386

Publisher

SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s11696-021-01725-5

Keywords

Corrosion; Polymeric inhibitor; Mild steel; Acidic solution; FTIR; UV-Vis

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The study found that PAM is an effective corrosion inhibitor for mild steel, with its inhibition efficiency increasing with PAM concentration and decreasing with temperature. The adsorption of PAM on the mild steel surface follows the Langmuir adsorption isotherm.
The corrosion inhibition behavior of mild steel in 2 M H3PO4 was investigated in the absence and the presence of Polyacrylamide (PAM) as a corrosion inhibitor. The influence of temperature and inhibitor concentration was studied using weight loss and electrochemical techniques. The results showed that PAM acted as a powerful inhibitor. The inhibition efficiency increased with PAM concentration and decreased with temperature. Maximum inhibition efficiency was 91.02% at 600 ppm of PAM and 30 degrees C. The adsorption of PAM on mild steel surface was found to fellow Langmuir adsorption isotherm. The value of the adsorption free energy was negative and lower than -20 kJ/mol, indicating a spontaneous and physical adsorption process. UV-Vis and FTIR investigations showed the formation of protective layer on mild steel surface. Statistical analysis is used to correlate the corrosion rate as a function of PAM concentration and temperature. Quantum chemical studies are used as a powerful tool for microscale analysis.

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