Corrosion Inhibition and Passivation Delay Action of Lauroamide Propylbetaine on Zinc in Alkaline Medium
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rosion Inhibition and Passivation Delay Action of Lauroamide Propylbetaine on Zinc in Alkaline Medium L. H. Zhoua, H. H. Liua, K. L. Liua, P. Hea, b, *, S. Wanga, L. P. Jiaa, F. Q. Dongc, D. C. Liua, and L. C. Dua aState
Key Laboratory for Environment-friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan, 621010 China b Mianyang Kingtiger New Energy Technology Co., Ltd., Mianyang, Sichuan, 621000 China c Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, Mianyang, Sichuan, 621010 China *e-mail: [email protected] Received June 21, 2019; revised October 24, 2019; accepted December 10, 2019
Abstract—The effects of lauroamide propylbetaine on zinc corrosion and passivation are investigated in 7.0 M KOH solution saturated with ZnO by Tafel polarization curve, electrochemical impedance spectroscopy and linear sweep voltammetry. It demonstrates that lauroamide propylbetaine acts as cathodic-type inhibitor and restrains zinc corrosion in alkaline medium through reducing the hydrogen evolution. With increasing concentrations of lauroamide propylbetaine, the corrosion inhibition effect and charge transfer resistance of zinc electrode enhance, and the corrosion inhibition efficiency reaches up to 84.1% in the presence of 800 ppm lauroamide propylbetaine. It is confirmed that the adsorption of lauroamide propylbetaine on the surface of zinc electrode follows Langmuir isotherm model. Besides, anodic polarization curves suggest that a small quantity of lauroamide propylbetaine is advantageous to delay the passivation of zinc electrode. Results reveal that the corrosion of zinc surface is alleviated in alkaline medium in the presence of 800 ppm lauroamide propylbetaine. Keywords: zinc electrode, corrosion, passivation, lauroamide propylbetaine, surfactant DOI: 10.1134/S1023193520080030
INTRODUCTION Zinc is spreadly employed as anode materials for primary and secondary zinc batteries [1–6] because it is inexpensive, nontoxic, earth-abundant and capable of offering high specific power, etc. Moreover, compared with other anode materials, zinc possesses unique physical and chemical properties, facilitating its extensive commercial application. Whereas, the performances of zinc electrode are impaired on account of the corrosion and passivation action in alkaline medium [7–10]. The corrosion of zinc electrode in alkaline medium derives from the formation of a mixed oxide and hydroxide layer on surface. The passivation of zinc electrode is identified as the formation of zinc oxide (ZnO) layer on its surface. For sake of adressing these issues, researches principally devote to suppressing corrosion of zinc electrode. Kheawhom et al. have reported that using 0.2 mM sodium dodecyl sulfate and 100 ppm Pluronic F-127 in 7.0 M KOH solution can effectively inhibit the corrosion and passivation of zinc anode [11]. Li et al. have reported that adding 0.05% imidazole (IMZ) and 0.05% poly(ethylene glycol) 600 (PEG) in 3.0 M
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