Utjecaj eteričnog ulja lovora na proces korozije aluminija

master's thesis

• Title (english): Impact of natural substances on the corrosion process of aluminium
• Author: Dijana Begić
• Mentor: Katarina Berković (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Chemistry and Biochemistry); (Laboratory for Physical Chemistry and Corrosion); Zagreb
• Defense date and country: 2011-12-19, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Food Technology

Abstract

U ovom radu ispitan je utjecaj dodatka eteričnog ulja lovora (koncentracija 20, 60, 100 i 150 ppm) na procese korozije aluminija u modelnim otopinama ( 3 % NaCl, 1 % CH3COOH, 1 % C6H8O6 i njihove smjese) pri temperaturama od 25, 50, 65 i 80 °C. Rezultati mjerenja pokazali su da utjecaj eteričnog ulja lovora na proces korozije aluminija ovisi o sastavu modelne otopine kao i o koncentraciji u kojoj se eterično ulje lovora nalazi u otopini. Najboljim inhibitorom korozije aluminija eterično ulje lovora može se smatrati u 3 % otopini NaCl gdje je postignut stupanj djelotvornosti od 76 %. U otopinama 1 % CH3COOH, 1 % C6H8O6 , i smjesi otopina 3 % NaCl + 1 % C6H8O6, 3 % NaCl + 1 % CH3COOH, pokazuje dosta nisku inhibicijsku djelotvornost (20-30 %), dok u smjesi svih ispitivanih otopina (3 % NaCl + 1 % C6H8O6 + 1 % CH3COOH) nije dokazano inhibicijsko djelovanje u ispitivanom rasponu koncentracija. Povišenje temperature ubrzava proces korozije aluminija u svim ispitivanim otopinama, a posebno u onim otopinama koje sadrže 1 % C6H8O6. SEM mjerenjima dokazano je postojanje adsorbiranih slojeva na površini aluminija, a na osnovu izračunatih Ea može se pretpostaviti da se aktivne molekule koje se nalaze u sastavu ovog ulja adsorbiraju na površinu aluminija procesom fizisorpcije.

Abstract (english)

This thesis evaluates the influence of addition of essential laurel oil (concentration of 20, 60, 100 and 150 ppm) on the corrosion process of aluminum in model solutions (3 % NaCl, 1 % CH3COOH, 1 % C6H8O6 and their mixtures) at temperatures 25, 50, 65 and 80 °C. Measurement results showed that the effect of essential laurel oil on the corrosion process of aluminum depends on the model solution as well as the concentration of essential laurel oil in the solution. The best corrosion protection of aluminum by essential laurel oil can be considered in 3 % NaCl solution where efficiency of 76 % has been reached. In solutions of 1 % CH3COOH, 1 % C6H8O6, and mixtures solutions of 3 % NaCl + 1 % C6H8O6 and 3 % NaCl + 1 % CH3COOH, a low inhibitory efficiency (20-30 %) is obtained, whereas in a mixture of all tested solutions (3 % NaCl + 1 % CH3COOH + 1 % C6H8O6) inhibitory effect is found. Increase of temperature accelerates the corrosion of aluminum in all tested solutions, especially in those containing 1 % C6H8O6. SEM measurements proved the existence of adsorbed layers on the surface of aluminum and on the basis of calculated Ea can be assumed that the active molecules of laurel oil are adsorbed on the surface of the aluminum by physisorption process.

• Keywords: aluminij; eterično ulje lovora; gravimetrija; inhibicija korozije; SEM
• Keywords (english): aluminium; corrosion inhibition; gravimetry; laurel oil; SEM
• Language: croatian
• URN:NBN: urn:nbn:hr:159:422794
• Study programme: Title: Food Technology; specializations in: Food Engineering; Course: Food Engineering; Study programme type: university; Study level: graduate; Academic / professional title: diplomirani inženjer prehrambene tehnologije; smjer prehrambeno inženjerstvo (diplomirani inženjer prehrambene tehnologije; smjer prehrambeno inženjerstvo)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-06-01 10:21:50