Corrosion Inhibition Studies of Metals in Acid Media by Fibrous Plant Biomass Extracts and Density Functional Theory: A Mini-Review

ABSTRACT

Metals used in industries are exposed to several processes such as acid cleaning, pickling, and descaling, which leads to corrosion. A good measure of corrosion control has been achieved by reducing the metal impurity content, by corrosion inhibition, the use of modification techniques, and the incorporation of alloying elements. However, the use of corrosion inhibitors seems to be the most economical and practical of the methods. Besides, the use of fibrous plant biomass as corrosion inhibitors has become important as a suitable substitute for the toxic chromates, phosphates, and arsenic-based inhibitors. The constituents in the fibrous plant biomass extracts react with the metal ions on a corroding metal surface forming organometallic complexes. The recent introduction of Density Functional Theory (DFT) in the theoretical study of the electronic structures elucidates the adsorption modes and the individual contributions of the plant extracts. The DFT has proven to be a significant contribution to the conventional methods based on gravimetry, gasometry, and electrochemical investigations for studying corrosion inhibition. This review provides insights into the use of fibrous plant extracts as corrosion inhibitors in acid solution as well as the DFT calculations.

摘要

工业中使用的金属暴露在几个过程中, 如酸洗, 酸洗和除锈, 从而导致腐蚀. 通过降低金属杂质含量, 缓蚀, 改性技术的使用以及合金元素的加入, 实现了良好的腐蚀控制措施. 然而, 使用缓蚀剂似乎是最经济和实用的方法. 此外, 利用植物纤维作为缓蚀剂已经成为一个重要的替代品有毒铬酸盐, 磷酸盐和砷基缓蚀剂. 纤维植物生物质提取物中的组分与腐蚀金属表面上的金属离子反应, 形成有机金属络合物. 近年来, 密度泛函理论 (DFT) 在电子结构理论研究中的引入, 阐明了植物提取物的吸附模式和个体贡献. 基于重量法和DFT的电化学方法对研究腐蚀有着重要的贡献. 本文综述了植物纤维提取物在酸性溶液中作为缓蚀剂的应用以及DFT计算.

KEYWORDS:

• Acid media
• corrosion
• corrosion inhibition
• density functional theory
• metals
• plant biomass extracts

关键词:

• 酸性介质
• 腐蚀
• 缓蚀
• 密度泛函理论
• 金属
• 植物生物质提取物