Adsorption of Anions of Higher Carboxylic Acids on Magnesium from Weakly Alkaline Aqueous Solutions

被引：8
|
作者：
Ogorodnikova, V. A. [1 ]
Kuznetsov, Yu. I. [1 ]
Andreeva, N. P. [1 ]
Luchkin, A. Yu. [1 ]
Chirkunov, A. A. [1 ]
机构：
[1] Russian Acad Sci, Frumkin Inst Phys Chem & Electrochem, Moscow 119071, Russia
来源：
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2020年 / 94卷 / 06期
基金：
俄罗斯科学基金会;
关键词：
adsorption; ellipsometry; corrosion; magnesium; corrosion inhibitors; electrochemical impedance spectroscopy; carboxylates; CORROSION; INHIBITORS;
D O I：
10.1134/S0036024420060187
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The adsorption of sodium salts of higher carboxylates on oxidized magnesium is studied via in situ reflective ellipsometry. It is shown that the free energies of adsorption of sodium oleyl sarcosinate (OsS) and sodium linoleate (LiS) is >55 kJ/mol, indicating the chemisorption of carboxylates on oxidized magnesium surfaces. Electrochemical impedance spectra, voltammetry, and corrosion testing show that sodium oleate (OlS) has the best protective properties on pure and oxidized magnesium. The strong protective properties of OlS are confirmed by Mg plate testing under conditions of a wet atmosphere with daily condensation. Tentative passivation of chemically oxidized Mg in a 16 mmol/L OlS solution protects against corrosion for 92-96 h.
引用
收藏
页码：1104 / 1110
页数：7
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