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Inhibitors of iron acid corrosion on the basis of unsaturated organic compoundsтезисы доклада
- Автор: Avdeev Ya G.
- Сборник: EVROCORR 2010. The European Corrosion Congress. 13-17 September 2010
- Тезисы
- Год издания: 2010
- Место издания: МАКС Пресс Moscow
- Первая страница: 119
- Последняя страница: 119
- Аннотация: Unsaturated compounds (UC): some acetylene compounds, a,b-unsaturated aldehydes and azomethins were investigated as inhibitors of iron acid corrosion. There was established that high protective properties of UC on steel corrosion are the consequences of their polymerization on the surface of the metal with the formation of hydrophobic protective film. Unhydrogenating UC are not able for polymerization and formation of protective film of polymers. As a rule the rise of unsaturation of UC increases their protective action. UC, with their high efficiency in HCl often turn out to be low-efficient or stimulate steel corrosion in the solutions of mineral acids (H2SO4, H3PO4, HClO4) with hydrophilic anions (HA). This effect is a consequence of cathodic hydrogenation of UC, which flows most effectively in the solutions of mineral acids with HA. Adding to the solution of such acids additives, suppressing cathodic discharge of hydrogene, increases the efficiency of UC sufficiently. It is shown that when hydrophobic anions (I, CNS, diethyldithiourethane) are present, azomethins in sulfuric solutions turn out to be not stimulators of corrosion but inhibitors, providing Z more than 99%. UC depending from their structure, composition of corrosion medium and conditions of corrosion flowing can change the mechanism of their action from adsorptive, which is the most universal but the least effective, till adsorptive-polymermaking, providing the highest coefficient of inhibition. The reason for such action of UC is in the dependence of the direction of dominating chemical inhibitor changing from the corrosion conditions. The following changings of UC are possible: 1) cathodic UC restoration, accelerating cathodic reaction and provoking the inhibitor expenditure; 2) UC volume polarization, making the inhibitor go out from the corrosion medium; 3) the formation of the protective polymer film on the metal surface, which is firmly connected with the steel surface. It is formed through the stage of the formation of complexes of surface atoms with UC molecules and changes its structure in the course of time. There are considered the examples of the protective films formation by some UC, their inhibition of steel corrosion and effects of protective aftereffect.
- Добавил в систему: Авдеев Ярослав Геннадиевич