The corrosion-inhibiting performance of (E)-N’-(4-bromobenzylidene)-2-(6-methoxynaphthalen-2-yl) propanehydrazide (BPH) and (E)-N’-(4-(dimethylamino) benzylidene)-2-(6-methoxynaphthalen-2-yl) propanehydrazide (MPH) for mild steel (MS) in 1.0 M HCl was investigated using electrochemical methods, weight loss measurements, and scanning electron microscope (SEM) coupled with energy dispersive X-ray spectroscope (EDX) analysis. Raising the concentration of both inhibitors towards an optimal value of 5 × 10⁻³ M reduced the corrosion current density (i_corr) and the corrosion rate of mild steel. The inhibitory effect of MPH, which showed the highest inhibition efficiency, was explored under a range of temperatures between 303 and 333 K. The inhibitory performance of both compounds significantly improved when the inhibitor concentration increased. The main result that flowed from potentiodynamic polarization (PDP) tests was that both compounds acted as mixed-type inhibitors, with a predominance cathodic effect. The adsorption of both compounds follows the Langmuir isotherm. SEM/EDX confirmed the excellent inhibition performance of tested compounds.

中文翻译：

---

萘普生为基础的Hy在1.0 M HCl中作为低碳钢的有效腐蚀抑制剂

（E）-N'-（4-溴亚苄基）-2-（6-甲氧基萘-2-基）丙酰肼（BPH）和（E）-N'-（4-（二甲基氨基）亚苄基）的缓蚀性能使用电化学方法，失重测量和扫描电子显微镜（SEM）结合能量色散X射线研究了用于1.0 M HCl中低碳钢（MS）的-2-（6-甲氧基萘-2-基）丙酰肼（MPH）分光镜（EDX）分析。将两种抑制剂的浓度提高至最佳值5×10 ^-3 M会降低腐蚀电流密度（i _corr）和低碳钢的腐蚀速率。在303至333 K的温度范围内探索了MPH的抑制作用，该抑制作用表现出最高的抑制作用。当抑制剂浓度增加时，两种化合物的抑制性能均显着提高。电位动力学极化（PDP）测试的主要结果是，这两种化合物均充当混合型抑制剂，具有显着的阴极效应。两种化合物的吸附均遵循Langmuir等温线。SEM / EDX证实了测试化合物的优异抑制性能。