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首页> 外文期刊>Coordination chemistry reviews >Recent progresses in Schiff bases as aqueous phase corrosion inhibitors: Design and applications
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Recent progresses in Schiff bases as aqueous phase corrosion inhibitors: Design and applications

机译：Schiff碱作为水相腐蚀抑制剂的最新进展：设计和应用

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Schiff bases (SBs) possess the basic feature of compounds that are primarily qualified to test as corrosion inhibitors for different metal/electrolyte systems. SBs adsorb and form corrosion mitigating surface film through their electron rich centers including C = N- (imine) moiety. The C = N- (imine) moiety offers strong bonding with the metallic ions because of its pi-acceptor properties. It is important to mention that SBs containing polar substituents at suitable positions can form chelates with the central metal ions therefore such SBs are expected to act as superior corrosion inhibitors as compared to the non-substituted SBs. Generally, electron donating substituents such as -OH (hydroxyl), -CH3 (methyl), -NH2 (amino) and -OCH3 (methoxy) are expected to increase the corrosion inhibition potentials of SBs. Halogens are also known to increase electron density at donor sites through their + R-effect. The present review article describes the collection on SBs as corrosion inhibitors for different metal/electrolyte systems. Electronic and molecular structural effects on the corrosion inhibition potential of SBs are discussed in relation to Hammett substituent constants. Interactions of SBs with metallic surfaces at molecular level are discussed in this report. A balanced level of hydrophilicity and hydrophobicity is indispensable for efficient corrosion inhibition activity. Extremely high hydrophobicity has a reducing effect corrosion inhibition performance by decreasing the solubility of the compounds in polar electrolytes. (C) 2021 Elsevier B.V. All rights reserved.
机译：Schiff碱（SBS）具有主要有资格测试作为不同金属/电解质系统的腐蚀抑制剂的化合物的基本特征。 SBS吸附并通过其电子富浓中心粘附和形成腐蚀缓解表面膜。 C = N-（亚胺）部分。 ＆ C = N-（亚胺）部分，由于其Pi-Conceriporitor属性，可以与金属离子的强键合。重要的是要提及在合适位置含有极性取代基的SBS可以形成与中央金属离子的螯合物，因此预期与未取代的SBS相比的腐蚀抑制剂。通常，预期诸如-OH（羟基），-CH 3（甲基），-NH 2（氨基）和-OOCH3（甲氧基）的电子提供取代基来增加SBS的腐蚀抑制电位。还已知卤素通过它们的+ R效应增加供体部位的电子密度。本综述文章介绍了SBS上的集合作为不同金属/电解质系统的腐蚀抑制剂。关于Hammett取代基常数讨论了对SBS腐蚀抑制电位的电子和分子结构效应。本报告中讨论了SBS与分子水平的金属表面的相互作用。均衡水平的亲水性和疏水性对于有效的腐蚀抑制活性是必不可少的。通过降低极性电解质中化合物的溶解度，极高的疏水性具有降低效果腐蚀性抑制性能。 （c）2021 elestvier b.v.保留所有权利。

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