School of Materials Science and Technology, Indian Institute of Technology (BHU) Varanasi, Varanasi, Uttar Pradesh, India.
Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, India.
Int J Biol Macromol. 2019 Nov 1;140:177-187. doi: 10.1016/j.ijbiomac.2019.08.073. Epub 2019 Aug 8.
Chitosan is one of the important natural bio-polymers. Besides its good green value, it is rarely used to protect metals in aggressive media in direct form due to rapid degradation of its molecules in acid. Hence, it is necessary to use some means to increase protection efficiency of chitosan. In present work, cobalt and tin sulfide nanoparticles are used to synthesize chitosan-cobalt and chitosan-SnS nanocomposites, and used for corrosion protection of mild steel (MS) in 1 M HCl at room temperature. The prepared composites are investigated by UV-visible spectroscopy, FTIR spectroscopy, HRSEM, HRTEM and EDAX techniques, which have shown successful formation of nanocomposites. Corrosion behavior of the composites have been examined by Tafel polarization curves (TPC), single sine electrochemical impedance spectroscopy (SSEIS) and surface analyzing techniques. The results have declared that chitosan-cobalt nanocomposite is more effective in corrosion inhibition of mild steel than chitosan-SnS nanocomposite. Alone chitosan provide only 77% inhibition to mild steel, while it increases for chitosan‑cobalt (>95%) and chitosan-SnS (>80%) composites. Isotherm study suggests that adsorption of chitosan/composites over MS is main reason of inhibition and can be best defined with Frumkin isotherm. Adsorption of chitosan and chitosan-nanocomposites over MS is also evident by SEM and AFM.
壳聚糖是一种重要的天然生物聚合物。除了良好的环保价值外，由于其分子在酸性介质中迅速降解，壳聚糖很少以直接形式用于保护腐蚀性介质中的金属。因此，有必要使用一些方法来提高壳聚糖的保护效率。在本工作中，使用钴和硫化锡纳米粒子合成壳聚糖-钴和壳聚糖-SnS 纳米复合材料，并将其用于室温下 1M HCl 中对低碳钢的腐蚀防护。通过 UV-可见光谱、FTIR 光谱、高分辨率扫描电子显微镜（HRSEM）、高分辨率透射电子显微镜（HRTEM）和 EDAX 技术对制备的复合材料进行了研究，表明成功合成了纳米复合材料。通过 Tafel 极化曲线（TPC）、单正弦电化学阻抗谱（SSEIS）和表面分析技术研究了复合材料的腐蚀行为。结果表明，壳聚糖-钴纳米复合材料对低碳钢的腐蚀抑制作用比壳聚糖-SnS 纳米复合材料更有效。单独的壳聚糖对低碳钢的抑制率仅为 77%，而壳聚糖-钴（>95%）和壳聚糖-SnS（>80%）复合材料的抑制率则有所提高。等温研究表明，壳聚糖/复合材料在 MS 上的吸附是抑制的主要原因，最符合 Frumkin 等温线。壳聚糖和壳聚糖纳米复合材料在 MS 上的吸附也可以通过 SEM 和 AFM 观察到。
