Page 8 - Дисертація_Сободош_Наталія_Йосипівна

8

АBSTRACT

Sobodosh N.Y. Development of an environmentally safe inhibitory

composition based on sodium alginate to protect aluminum alloy against corrosion

and tribocorrosion.

Dissertation for the degree of Doctor of Philosophy in the field of knowledge

16 – Chemical Engineering and Bioengineering, in the specialty 161 – Chemical

Technologies and Engineering. – Karpenko Physico-Mechanical Institute of the

National Academy of Sciences of Ukraine, Lviv, 2026.

This thesis is devoted to the development of an environmentally safe

inhibitory composition based on sodium alginate to protect aluminum alloys against

corrosion and tribocorrosion, and to identifying the mechanisms underlying its

protective action and assessing its effectiveness in chloride-containing

environments.

The first chapter presents a thorough analysis of the scientific and technical

literature on the physicochemical properties of aluminum and its alloys, their
corrosion and tribocorrosion behavior, and the mechanisms of surface passivation

and depassivation. Modern approaches to inhibitor protection of aluminum alloys
are considered, in particular, the use of anodic, cathodic, and mixed inhibitors.

Particular attention is paid to environmentally safe corrosion inhibitors based on
renewable plant raw materials and polysaccharides. The potential for using

polysaccharides in combined inhibitory systems to protect aluminum alloys against

corrosion-mechanical damage is demonstrated. Such substances can provide

corrosion protection through a complex mechanism of action: adsorption on the

metal surface, formation of protective films, chelation of metal ions, and

modification of the near-surface layer. Emphasis is placed on the need to study the

behavior of polysaccharides in tribocorrosion processes, where mechanical and

corrosive factors act simultaneously. Under these conditions, ensuring rapid

repassivation of the surface following mechanical activation is crucial, placing