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Open AccessArticle

Water Pipes Corrosion Inhibitors for Q235 Steel in Hydrochloric Acid Medium Using Spiropyrazoles Derivatives

Engineering Chemistry Department, High Institute of Engineering &Technology (New Damietta), New Damietta 34517, Egypt
Al-Qunfudah Center for Scientific Research (QCSR), Chemistry Department, Al-Qunfudah University College, Umm Al-Qura University, Al Qunfudhah 21912, Saudi Arabia
Textile Technology Department, Industrial Education College, Beni-Suef University, Beni Suef 62511, Egypt
Egypt and Chemistry Department, Faculty of Science, Jazan University, Jizan 45142, Saudi Arabia
Department of Civil Engineering, Faculty of Engineering, Suez Canal University, Ismailia 41522, Egypt
Department of Chemistry, Faculty of Science, University of Cairo, Giza 12613, Egypt
Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University, Makkah Almukkarramah 21955, Saudi Arabia
Authors to whom correspondence should be addressed.
Coatings 2020, 10(2), 167;
Received: 18 December 2019 / Revised: 29 January 2020 / Accepted: 1 February 2020 / Published: 12 February 2020
Water pipes and drinking water quality deterioration in distribution systems and sea water desalination impose the use of corrosion inhibitors. The protective effect of spiropyrazole derivatives against Q235 steel and its adsorption performance were examined in solution of 1 M HCl utilizing TP (Tafel polarization), electrochemical frequency modulation (EFM), and electrochemical impedance spectroscopy (EIS) tests. The outcome data from hindrance efficiency rise with the dose of inhibitor. The orders of %IE of spiropyrazole derivatives are given: (1) > (2) > (3).It was noted that the values of EHOMO and ELUMO dropping in order run parallel to the improvement in %IE, which support the preceding order. EIS spectra exhibited one capacitive loop and approve the protective ability. Molecular docking was utilized to get a full picture on the binding mode among spiropyrazoles derivatives and the receptor of 3tt8-hormone of crystal structure examination of Cu human insulin derivative. The morphology of protected Q235 steel was evaluated by checking electron magnifying instrument innovation with energy dispersive X-beam spectroscopy (SEM–EDX).
Keywords: spiropyrazoles; 3tt8-hormone; Q235 steel; SEM–EDX; molecular docking spiropyrazoles; 3tt8-hormone; Q235 steel; SEM–EDX; molecular docking
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MDPI and ACS Style

Eldesoky, A.; Hassan, H.M.; Subaihi, A.; El Shahawy, A.; Farghaly, T.A. Water Pipes Corrosion Inhibitors for Q235 Steel in Hydrochloric Acid Medium Using Spiropyrazoles Derivatives. Coatings 2020, 10, 167.

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