Polyethylene glycol and polyvinylpyrrolidone: potential green corrosion inhibitors for copper in H2SO4 solutions

• N.T. Talat¹, A.A. Dahadha², M. Abunuwar³, A.A. Hussien¹ and Wafa’a Odeh⁴

¹ Department of Mechanical, Faculty of Engineering, Al-Huson University College, Al-Balqa Applied University, P.O. Box 21510 (50), Irbid, Jordan
² Department of Biotechnology and Genetic Engineering, Faculty of Science, Philadelphia University, P.O. Box 19392, Amman, Jordan
³ Faculty of Pharmacy, Philadelphia University, P.O. Box 19392, Amman, Jordan
⁴ Department of Allied Medical Sciences, Al-Zarqa University College, Al-Balqa Applied University, Alzarqa, Jordan

Abstract: Weight-loss, thermometric, and electrical conductance techniques were employed for the investigation of the influence of polyethylene glycol 400, 4000, and polyvinylpyrrolidone K15 as cost-effective, efficient, and eco-friendly inhibitors on the corrosion inhibition of copper in H₂SO₄ solution. The corrosion rates of copper in H₂SO₄ solutions increase with an increase in acid concentrations and temperatures in the absence of inhibitors. The addition of PEG 400, PEG 4000, and PVP K15 to the corrosive solutions was found to have a considerable inhibitory influence on the corrosion rates of copper at various temperatures. Consequently, the inhibition efficiency of PEG 400, PEG 4000 and PVP K15 increases with an increase in their concentrations. Remarkably, PVP K15 was a more efficient inhibitor than PEG 400, and PEG 4000, this effect might be attributed to the nature of the functional groups and the size of the PVP K15 chains. An evaluation of the temperature effect was studied to show that rising temperatures lead to an increased corrosion rate and lower inhibition efficiencies. However, PEG 400, PEG 4000, and PVP K15 inhibited copper corrosion by virtue of adsorption, which was found to accord with the Langmuir and Temkin adsorption isotherm models. Moreover, the thermodynamic aspects (ΔH⁰, ΔS⁰ and E_a) of the adsorption process were calculated and discussed.

Keywords: corrosion inhibitor, copper, polyethylene glycol, polyvinylpyrrolidone, Temkin and Langmuir adsorption isotherms

Int. J. Corros. Scale Inhib., 2023, 12, no. 1, 215-243
doi: 10.17675/2305-6894-2023-12-1-13

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