Abstract In present study, an isoxazole derivative, namely, (Z)-4-(4-hydroxy-3-methoxybenzylidene)-3-methylisoxazol-5(4H)-one (IOD) has been studied as an environment-friendly corrosion inhibitor for mild steel (MS) in acidic medium (1M HCl). The present work was investigated by gravimetric, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), fourier-transform infrared (FT-IR) spectroscopy techniques. Atomic force microscopy (AFM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) confirmed the surface morphologies of the MS surface with and without IOD in the acid medium. The inhibition efficiency (I.E.) of IOD was increased by rising its concentration attaining maximum value (96.6%) at 300 ppm at 30 ⁰C and decreases with increasing temperature from 30 ⁰C to 60 ⁰C. The adsorption of studied inhibitor followed Langmuir adsorption isotherm model. The PDP study revealed that the IOD acts as a mixed-type inhibitor with predominating anodic effect. The EIS study confirmed that increasing IOD concentration enhances the charge transfer resistance (Rct) and then reduces the double layer capacitance (Cdl) owing to the development of a protective layer on the MS surface.

中文翻译：

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在 1 M HCl 中作为低碳钢缓蚀剂的异恶唑衍生物的重量、电化学和形态研究

摘要 在目前的研究中，异恶唑衍生物，即 (Z)-4-(4-羟基-3-甲氧基亚苄基)-3-甲基异恶唑-5(4H)-酮 (IOD) 作为一种环境友好型缓蚀剂进行了研究。用于酸性介质 (1M HCl) 中的低碳钢 (MS)。通过重量分析、电化学阻抗谱 (EIS)、动电位极化 (PDP)、傅里叶变换红外 (FT-IR) 光谱技术对目前的工作进行了研究。原子力显微镜 (AFM)、扫描电子显微镜 (SEM) 和能量色散 X 射线光谱 (EDS) 证实了 MS 表面在酸性介质中具有和不具有 IOD 的表面形态。IOD 的抑制效率 (IE) 通过增加其浓度在 30 ⁰C 下在 300 ppm 处达到最大值 (96.6%) 而增加，并随着温度从 30 ⁰C 升高到 60 ⁰C 而降低。所研究抑制剂的吸附遵循朗缪尔吸附等温线模型。PDP 研究表明，IOD 作为一种混合型抑制剂，具有主要的阳极效应。EIS 研究证实，由于在 MS 表面形成保护层，增加 IOD 浓度会增强电荷转移电阻 (Rct)，然后降低双电层电容 (Cdl)。