Корозійна стійкість алюмінієвої фольги в розчинах поверхнево-активних речовин

Abstract

Проведено корозійні випробування зразків алюмінієвої фольги у водних розчинах промислових поверхнево-активних речовин (ПАР). Визначено глибинний показник і швидкість корозії фольги в розчинах аніоноактивних та неіоногенних ПАР. Установлено ПАР, розчини яких не виявляють помітної корозійної дії на блискучу поверхню фольги.

Application of surface-active substances in food technologies requires the need for corrosion testing of aluminum foil in aqueous solutions of industrial SAS. The purpose of the work is to determine the corrosion resistance of aluminum foil in alkaline aqueous solutions of the surface-active substances. The corrosion resistance of the foil samples was evaluated by the gravimetric and electrochemical methods. The foil samples were kept in aqueous solutions SAS for 48 hours at a temperature of 298K. During the test the samples of the foil were in an electrical contact with the steel plates. The corrosion rate of the foil was determined by the change in mass of the samples during the corrosion per unit of surface and time of the researches. It is also found that the solutions of the nonionic SAS, such as "Syntamid-5" and "Dytalan E", show no appreciable corrosive action on the aluminum foil. After the tests the shiny foil surface remained intact in their solutions and had no visible signs of corrosion. According to the scale of the corrosion resistance of metals, the foil in such an environment is "very stable", the deep corrosion rate reached 0.010...0.013 mm/year.