In this study, the corrosion inhibition properties of nanocontainer-type layered double hydroxide (LDH) are evaluated on iron that is immersed in a 3.5% NaCl aqueous solution. LDH ZnAl-NO₃ was synthesized via coprecipitation. The material presents satisfactory crystallinity with a Zn/Al ratio of 2:1. Methyl orange (MO) has been added into the synthesis process by exchange with nitrate ions and/or by adsorption of MO onto LDH surfaces (LDH-MO). Iron was immersed in solutions with various concentrations of LDH and LDH-MO ranged 1–6 gl⁻¹, and the corrosion inhibition properties were investigated using linear sweep votammetry, electrochemical impedance spectroscopy (EIS), and SEM. Based on pitting potential studies, LDH has demonstrated inhibition of the pitting corrosion process, and the optimal concentration was identified as 2 gl⁻¹. The presence of MO in LDH provides excellent anticorrosive properties with a mixed inhibition mechanism. The corrosion potential of LDH-MO presents more noble values and exchange current densities that are one order of magnitude less than those of the bare iron after 72 h of immersion in a 3.5% NaCl aqueous solution. EIS results corroborated that the corrosion resistance increased when 2 gl⁻¹ of LDH-MO was in solution. SEM images support the anticorrosive behaviour of the LDH-MO.

在这项研究中，对浸渍在3.5％NaCl水溶液中的铁评估了纳米容器型层状双氢氧化物（LDH）的缓蚀性能。通过共沉淀合成LDH ZnAl-NO ₃。该材料具有令人满意的结晶度，Zn / Al比为2：1。通过与硝酸根离子交换和/或通过将MO吸附到LDH表面（LDH-MO），已将甲基橙（MO）添加到合成过程中。将铁浸入各种浓度的LDH和LDH-MO范围为1-6 gl ^-1的溶液中，并使用线性扫描伏安法，电化学阻抗谱（EIS）和SEM研究了缓蚀性能。基于点蚀潜能研究，LDH已证明抑制点蚀腐蚀过程，最佳浓度确定为2 gl ^-1。LDH中MO的存在提供了优异的防腐性能以及混合抑制机制。LDH-MO的腐蚀电位比在3.5％NaCl水溶液中浸泡72小时后，其贵金属值和交换电流密度比裸铁低一个数量级。EIS结果证实当LDH-MO为2gl ^-1时，耐腐蚀性提高。SEM图像支持LDH-MO的防腐蚀行为。