Utjecaj meda kestena na koroziju kositra u 3%-tnoj otopini natrijeva klorida

master's thesis

• Title (english): Influence of chestnut honey on tin corrosion in 3% solution of sodium chloride
• Author: Gorana Marušić
• 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: 2005-06-08, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

U ovom radu istraženo je djelovanje meda kestena na proces korozije kositra u 3% - tnoj otopini natrijeva klorida. Korištene metode određivanja su: mjerenja prirasta mase, katodna polarizacija i određivanje polarizacijskog otpora. Brzine korozije odnosno stupnjevi zaštite od korozije određeni su metodom prirasta mase sa šest uzoraka kositra u vodenim i 3% - tnim otopinama NaCl pripravljenim dodatkom koncentracija meda kestena u rasponu od 200 do 1000 ppm. Određivanja struja korozije odnosno stupnjeva zaštite od korozije metodama katodne polarizacije i polarizacijskog otpora provedena su potenciostatom i troelektrodnom ćelijom. Troelektrodna ćelija sastoji se od kositrene radne elektrode, referentne kalomel elektrode i platinske protuelektrode. Ta određivanja su provedena u 3% - tnim otopinama NaCl pripravljenim sa 200, 500 i 800 ppm meda kestena. Porastom koncentracija meda kestena u vodenim otopinama raste stupanj zaštite od korozije. Najveći stupanj zaštite od korozije zabilježen je u koncentracijama 800 ppm meda kestena u 3% - tnoj otopini NaCl metodama prirasta mase i katodne polarizacije, dok je metodom polarizacijskog otpora zabilježen pri 500 ppm. Zaštitni sloj meda kestena je adsorbiran na površini kositra prema Langmuirovoj adsorpcijskoj izotermi.

Abstract (english)

In this work the influence of chestnut honey on tin corrosion process in 3% sodium chloride solution was investigated. The methods used for evaluation were weight increase measurements, cathode polarization and polarization resistance measurements. Corrosion rate defined by weight increase measurement with six tin samples in 3% solution NaCl and chestnut honey at concentrations in range from 200 to 1000 ppm was measured. Corrosion current measurements by cathode polarization and polarization resistance methods were conducted with potentiostat and three electrode cell. Three electrode cell consists of tin, reference calomel and platinum counter electrode. These measurements were performed in 3% solution NaCl and chestnut honey at concentrations 200, 500 and 800 ppm. Increasing concentration of chestnut honey in water solutions increases degree of corrosion protection. The highest corrosion protection degree was measured at concentration 800 ppm of chestunt honey in 3% solution NaCl according to weight increase measurement and cathode polarization methods, while by polarization resistance method occured at 500 ppm. Protective chestnut honey film adsorbed on tin surface according to Langmuir adsorption isotherm.

• Keywords: ambalaža; inhibitori; korozija; kositar; med
• Keywords (english): corrosion; honey; inhibitors; packing; tin
• Language: croatian
• URN:NBN: urn:nbn:hr:159:638408
• Study programme: Title: Biotechnology; specializations in: Biochemical Engineering; Course: Biochemical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: diplomirani inženjer biotehnologije; smjer biokemijsko inženjerstvo (diplomirani inženjer biotehnologije; smjer biokemijsko inženjerstvo)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-09-13 09:57:26