Ganjoo Richika, Sharma Shveta, Verma Chandrabhan, Quraishi M A, Kumar Ashish
Department of Chemistry, School of Chemical Engineering and Physical Sciences, Lovely Professional University, Punjab, India.
Center of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
Int J Biol Macromol. 2023 Apr 30;235:123571. doi: 10.1016/j.ijbiomac.2023.123571. Epub 2023 Feb 5.
Carbohydrate polymers (polysaccharides) and their derivatives are widely utilized in sustainable corrosion inhibition (SCI) because of their various fascinating properties including multiple adsorption sites, high solubility and high efficiency. Contrary to traditional synthetic polymer-based corrosion inhibitors, polysaccharides are related to the 4E dimension, which stands for Energy, Economy, Ecology, and Effectivity. Furthermore, they are relatively more environmentally benign, biodegradable, and non-bioaccumulative. The current review describes the SCI features of various heteropolysaccharides, including gum Arabic (GA), glycosaminoglycans (chondroitin-4-sulfate (CS), hyaluronic acid (HA), heparin, etc.), pectin, alginates, and agar for the first time. They demonstrate impressive anticorrosive activity for different metals and alloys in a variety of corrosive electrolytes. Through their adsorption at the metal/electrolyte interface, heteropolysaccharides function by producing a corrosion-protective film. In general, their adsorption follows the Langmuir isotherm model. In their molecular structures, heteropolysaccharides contain several polar functional groups like -OH, -NH, -COCH, -CHOH, cyclic and bridging O, -CHSOH, -SOOH, -COOH, -NHCOCH, -OHOR, etc. that serve as adsorption centers when they bind to metallic surfaces.
碳水化合物聚合物（多糖）及其衍生物因其具有多种迷人特性，包括多个吸附位点、高溶解性和高效性，而被广泛应用于可持续缓蚀（SCI）领域。与传统的基于合成聚合物的缓蚀剂不同，多糖与4E维度相关，即能源（Energy）、经济（Economy）、生态（Ecology）和有效性（Effectivity）。此外，它们对环境相对更友好，可生物降解且无生物累积性。本综述首次描述了各种杂多糖的SCI特性，包括阿拉伯胶（GA）、糖胺聚糖（硫酸软骨素-4（CS）、透明质酸（HA）、肝素等）、果胶、藻酸盐和琼脂。它们在各种腐蚀性电解质中对不同金属和合金表现出令人印象深刻的防腐活性。通过在金属/电解质界面的吸附，杂多糖通过形成防腐膜发挥作用。一般来说，它们的吸附遵循朗缪尔等温线模型。在其分子结构中，杂多糖含有几个极性官能团，如-OH、-NH、-COCH、-CHOH丶环状和桥连的O、-CHSOH、-SOOH、-COOH、-NHCOCH、-OHOR等，当它们与金属表面结合时，这些官能团作为吸附中心。
