Cresol red as corrosion inhibitor in chitosan thin layers on zinc

Regina- Henriett Buier, G. Szabó, L. Muresan
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Abstract

Introduction Chitosan (Chit) is a biopolymer which is synthesized by the deacetylation of chitin extracted from the shells of crustaceans. In the past few years, chitosan was widely used in physical and electrochemical research due to its costefficiency, low toxicity and ecofriendly nature [1]. The corrosion inhibition potential of chitosan is due to the amino and hydroxyl groups present in the polymer structure. Chitosan can provide a possible temporary coating on several metal layers [2-3] and the anti-corrosive properties can improve by adding different inhibitors in the chitosan system. Cresol red (CR) is a widely used pH indicator, red below 1 pH, yellow/orange at pH below 7.2 and purple color at pH higher than 8.8. In the pH range between 7.2 and 8.8 is red [4]. This study focuses on the influence of cresol red as a possible corrosion inhibitor for chitosan thin layers on zinc substrates and at the same time a possible indicator of corrosion process starting by color change of the coating.
甲酚红在壳聚糖薄层锌表面的缓蚀作用
壳聚糖(Chit)是从甲壳类动物的壳中提取甲壳素进行脱乙酰反应而合成的一种生物聚合物。近年来,壳聚糖因其经济、低毒、环保等特点,在物理和电化学研究中得到了广泛的应用[1]。壳聚糖的缓蚀潜力是由于聚合物结构中存在的氨基和羟基。壳聚糖可以在几种金属层上提供可能的临时涂层[2-3],并且通过在壳聚糖体系中添加不同的抑制剂可以提高其防腐性能。甲酚红(Cresol red, CR)是一种广泛使用的pH指示剂,pH值低于1时呈红色,pH值低于7.2时呈黄色/橙色,pH值高于8.8时呈紫色。pH值在7.2 ~ 8.8之间为红色[4]。研究了甲酚红作为锌基壳聚糖薄层缓蚀剂的影响,同时也研究了甲酚红作为锌基壳聚糖薄层颜色变化开始的腐蚀过程的可能指标。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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