The chitosan as a natural and inexpensive polymer is considered as an appropriate choice towards the corrosion inhibitory. Here, the corrosion and inhibition efficacy of iron sheets is examined in the H₂SO₄ solution and the presence of chitosan and potassium iodide as an inhibitor through gravimetry, potentiodynamic polarization, and impedance analyses. The inhibition performance is found to be enhanced by adding chitosan concentration. The experimental data demonstrate that the doping iodide ion to chitosan is efficient on the surface coverage and the inhibition performance. The introduced inhibitors are of the interface inhibitors → liquid phase → mixed type with the physical adsorption. The adsorption of iodized chitosan on the iron surface is followed Langmuir isotherm. These inhibitors, by changing the electrical double layer, increase the resistance of charge transfer. The existence of iodide in the chitosan structure improves the electron density of polymer and strengthens the interaction between inhibitor and metal.

中文翻译：

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增加壳聚糖对酸性介质中铁腐蚀的抑制活性的简单策略

壳聚糖是一种天然且廉价的聚合物，被认为是缓蚀剂的合适选择。在此，在H ₂ SO _4中检查了铁片的腐蚀和抑制效能重量分析法，电位动力学极化法和阻抗分析法可知溶液中存在壳聚糖和碘化钾作为抑制剂。发现通过添加壳聚糖浓度可以提高抑制性能。实验数据表明，向壳聚糖掺杂碘离子对表面覆盖和抑制性能有效。引入的抑制剂是界面抑制剂→液相→物理吸附混合型。朗格缪尔等温线跟踪碘化壳聚糖在铁表面的吸附。这些抑制剂通过改变双电层增加了电荷转移的阻力。壳聚糖结构中碘化物的存在提高了聚合物的电子密度，并增强了抑制剂与金属之间的相互作用。