Inhibition of Corrosion of Mg90 Alloy with Compositions Based on Sodium Oleate. Part I. Salts of Higher Alkenyl and Aryl Carboxylates

Ogorodnikova, V.A.; Kuznetsov, Y.I.; Chirkunov, A.A.

Авторы: Ogorodnikova V.A., Kuznetsov Yu I., Chirkunov A.A.
Журнал: Protection of Metals and Physical Chemistry of Surfaces
Номер: 24
Год издания: 2021
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
Первая страница: 1336
Последняя страница: 1343
DOI: 10.1134/S2070205121070121
Аннотация: Abstract—In this paper, the possibility of enhancement of protective action of sodium oleate (SOl) toward Mg90 magnesium alloy is studied through its combined use with following sodium salts: oleyl sarcosine (SOs), mixture of alkenylsuccinic acids (SASA), and flufenamic acid (SFF). It is determined that introduction of 8 mM of most of the blends to the borate solution with 1 mM NaCl results in more effective inhibition of local depassivation of Mg90 than SOl at the same concentration. The highest anti-pitting basis is achieved upon addition of equimolar composition of SOl and SFF (2.40 V). By recording anodic polarization curves and tests in the humid atmosphere, the protection ability of the adsorption layers formed from aqueous solutions of 16 mM inhibitors and their blends is evaluated. It is shown that surface modification in SOl solutions with SFF and particularly SOs leads to a slight increase in protection, which depends significantly on the molar ratio of the components. A higher degree of protection is provided by the blends of SOl with SASA. The mixture of 12 mM SOl + 4 mM SASA is the most effective among them. Treatment in such solution with subsequent drying at 65°C significantly slows down corrosion even under severe conditions of periodic condensation of moisture on the specimens.
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Inhibition of Corrosion of Mg90 Alloy with Compositions Based on Sodium Oleate. Part I. Salts of Higher Alkenyl and Aryl Carboxylatesстатья

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