Department of Chemistry, Netaji Subhas University of Technology, New Delhi 110078, India(1).
Department of Applied Science, Bharati Vidyapeeth's College of Engineering, New Delhi 110063, India.
Carbohydr Polym. 2020 Apr 15;234:115945. doi: 10.1016/j.carbpol.2020.115945. Epub 2020 Feb 3.
Considering the advancements in the applications of biopolymers such as Chitosan due to its biocompatibility, biodegradability and non-toxic properties, five different Chitosan cinnamaldehyde Schiff bases (Chi-Cn1-5) using chitosan and cinnamaldehyde as monomer units were synthesized by varying the degree of substitution. Further, anti-corrosion property of all these biopolymers against corrosion of mild steel was studied in 0.5 M HSO by gravimetric and electrochemical methods. Scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), atomic force microscopy (AFM), scanning electrochemical microscopy (SECM) and X-ray photoelectron spectroscopy (XPS) were utilized to affirm the adsorption of studied biopolymers at the metal/electrolyte interface by inhibiting mild steel (MS) corrosion. The shift (<85 mV) in the value of corrosion potential by the presence of biopolymers affirmed their mixed-type nature of inhibition. The results depicted that Chi-Cn5 performs best against corrosion of mild steel in acid medium among all other biopolymers due to its maximum degree of substitution.
考虑到壳聚糖等生物聚合物在应用方面的进展，由于其生物相容性、可生物降解性和无毒特性，使用壳聚糖和肉桂醛作为单体单元，通过改变取代度合成了五种不同的壳聚糖肉桂醛席夫碱（Chi-Cn1-5）。此外，通过重量法和电化学方法研究了所有这些生物聚合物在 0.5 M HSO 中对低碳钢腐蚀的防腐性能。利用扫描电子显微镜结合能谱（SEM-EDS）、原子力显微镜（AFM）、扫描电化学显微镜（SECM）和 X 射线光电子能谱（XPS）证实了所研究的生物聚合物通过抑制低碳钢（MS）腐蚀在金属/电解质界面的吸附。生物聚合物的存在使腐蚀电位值发生了(<85 mV)的偏移，这证实了它们混合抑制的性质。结果表明，由于 Chi-Cn5 的取代度最大，它在所有其他生物聚合物中对酸性介质中低碳钢的腐蚀表现最佳。
