锂盐对 2024 铝合金缓蚀作用的比较研究

IF 7.5 Q1 CHEMISTRY, PHYSICAL
Anh Truc Trinh , Anh Son Nguyen , Thu Thuy Thai , Nicolas Caussé , Nadine Pébère
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引用次数: 0

摘要

本研究采用全局和局部电化学技术研究了锂盐(硝酸盐、草酸盐和碳酸盐)对 AA2024 的腐蚀抑制作用。与存在 0.1 M Li2C2O4 或 0.1 M Li2CO3 时的结果相比,使用 LiNO3(0.1 M)时,阳极和阴极电流密度较低,阻抗值较高。在电解液中浸泡 20 小时后,扫描电子显微镜的观察结果表明,在碳酸盐或草酸盐存在的情况下,AA2024 表面形成了厚膜,而在硝酸盐存在的情况下,则形成了更薄更致密的膜。通过对沉积在 AA2024 板上的水性环氧树脂涂层上的人工划痕进行局部阻抗测量,显示了 Li2C2O4 或 Li2CO3 的自愈效应,这证实了它们作为抑制剂在有机涂层中的潜在用途。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A comparative study of lithium salts for the corrosion inhibition of 2024 aluminium alloy

In the present work, the corrosion inhibition of AA2024 by lithium salts (nitrate, oxalate and carbonate) is investigated by using both global and local electrochemical techniques. With LiNO3 (0.1 M), the anodic and cathodic current densities are lower and the impedance values higher by comparison with the results obtained in the presence of 0.1 M Li2C2O4 or 0.1 M Li2CO3. After 20 h of immersion in the electrolyte, SEM observations reveal the formation of thick films on the AA2024 surface in the presence of carbonate or oxalate, whereas a thin and denser film is formed in the presence of nitrate. Specifically, the Li2C2O4 addition, by increasing the pH of the electrolyte, induces significant alloy dissolution from the very beginning of immersion which contributes to the growth of a protective layer on the alloy surface, combining lithium, carbonate species and metal cations.

A self-healing effect by Li2C2O4 or Li2CO3 is shown by local impedance measurements on artificial scratches made on a water-based epoxy coating deposited on AA2024 plates, confirming their potential use, as inhibitive species, in organic coatings.

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来源期刊
CiteScore
8.10
自引率
1.60%
发文量
128
审稿时长
66 days
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