Corrosion inhibitor from nature: Fundamentals of tannic acid inhibition for AA2024 alloy

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL Applied Surface Science Pub Date : 2024-10-05 DOI:10.1016/j.apsusc.2024.161434

Rubén del Olmo, Alexandre Bastos, Kiryl Yasakau, Alesia Sushkova, Raúl Arrabal, João Tedim

引用次数: 0

Abstract

This study addresses the fundamentals of corrosion inhibition of AA2024 alloy by tannic acid (TA), a Cr-free and eco-friendly natural product. To this end, the AA2024 alloy was immersed in NaCl solution (50 mM) with different TA concentrations (0.1–10 mM) for 7 days. Surface (SEM, Raman, and SKPFM) and electrochemical analyses (EIS, PDP, and SVET) revealed mixed inhibition after 1 day of immersion in TA solution. Long-term immersion tests in TA solutions produced a tannate-rich oxide film on the surface. The films with low tannate content (formed in 0.1 and 1 mM TA) showed the highest stability and corrosion resistance.

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来自大自然的缓蚀剂单宁酸抑制 AA2024 合金的基本原理

本研究探讨了单宁酸（TA）抑制 AA2024 合金腐蚀的基本原理，单宁酸是一种不含铬的环保型天然产品。为此，将 AA2024 合金浸入含有不同浓度（0.1-10 mM）TA 的 NaCl 溶液（50 mM）中 7 天。在 TA 溶液中浸泡 1 天后，表面（SEM、拉曼和 SKPFM）和电化学分析（EIS、PDP 和 SVET）显示出混合抑制作用。在 TA 溶液中长期浸泡测试会在表面生成富含鞣酸的氧化膜。鞣酸含量低的薄膜（在 0.1 和 1 mM TA 溶液中形成）显示出最高的稳定性和耐腐蚀性。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.