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Enalapril maleate as a green accelerator for zinc phosphating coating on low-carbon steel
Weishan Wang,Yuqin Tian,Aojue Ke,Haowei Huang,Huifang Shen,Xinya Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
In this study, enalapril maleate (EM), a green ingredient of an antihypertensive drug, was selected as anaccelerator for phosphate coating promoting on low-carbon steel. The scanning electron microscope(SEM), X-ray diffraction (XRD), 3D morphologies, coating weight, coating thickness and free acidity(FA) as well as total acidity (TA) were characterized to analyze the coating performance. Copper sulfatetitration, potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) wereperformed to evaluate corrosion resistance of phosphate coatings. The DFT computations were appliedto explore the phosphating promoting mechanism. The results show that the EM optimal concentrationis 1.6 g/L which lowers the operating temperature (form 80 ℃ to 40 ℃), generates the smoothest (Ra = 2. 85 lm), the heaviest (28.35 g/cm2) and the thinnest (21.6 lm) coating, and reduces the corrosion ratefrom 1.099 mpy of blank to 0.0246 mpy. The density functional theory (DFT) results confirm that EMadsorbs on low-carbon steel by electrophilic sites (N10) as well as nucleophilic sites (C10), forms nucleatedparticles preferentially and accelerates the growth of crystals. Therefore, EM is a green organic compoundwith high phosphating promotion efficiency which has potential application prospects inindustrial phosphating.
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