20.500.12556/DKUM-61103 ELEKTROKEMIJSKA ANALIZA ALUMINIJEVE ZLITINE 6082 V KLORIDNEM MEDIJU THE ELECTROCHEMICAL ANALYSIS OF AN ALUMINUM ALLOY 6082 IN CHLORIDE MEDIUM Namen diplomskega dela je preučiti vpliv različnih koncentracij NaCl in temperature na korozijsko obstojnost aluminijeve zlitine 6082. Pri tem smo uporabili 1-odstotno in 5-odstotno raztopino NaCl pri 25 in 50 °C. Za izračun korozijske hitrosti smo uporabili rezultate meritev spremembe mase po potopitvenem preskusu. Pokazalo se je, da potopitveni preskus za izbran sistem ni najbolj primern, zato smo v nadaljevanju uporabili še elektrokemijsko analizo, pri kateri smo uporabili naslednje metode: kronopotenciometrijo, merjenje polarizacijske upornosti in ciklično polarizacijo. Rezultati potopitvenih preskusov kažejo, da najhitreje korodira aluminijeva zlitina pri 25 °C v 5-odstotni raztopini NaCl. Masa vzorcev zlitine, ki so bili izpostavljeni 50 °C, se je po potopitvenih preizkusih povečala zaradi nastalih korozijskih produktov. Pri kronopotenciometrični metodi, pri kateri merimo spremembo potenciala s časom, dobimo rezultat za korozijski potencial, ki je bil pri najbolj negativnih vrednostih v 5-odstotni raztopini NaCl pri 50 °C. Rezultati polarizacijske upornosti kažejo, da enakomerna korozija najmanj prizadene aluminijevo zlitino 6082, ko je izpostavljena 1-odstotni raztopini NaCl pri 25 °C. Oblika ciklične zanke, pove, da se aluminij aktivno raztaplja v kloridnem mediju. The purpose of this thesis is to research the effects of different concentrations of chloride ions and different temperatures on the corrosion durability of the aluminium alloy 6082. To test this, samples were immersed in 1 % and 5 % solutions of NaCl at 25 and 50 °C. The rate of corrosion was determined using immersion test, but as it proved unreliable, an electrochemical analysis was used with the following methods: chronopotentiometry, polarisation resistance measurements and cyclic polarisation measurements. The results indicated that the aluminium corroded the fastest in the 5 % NaCl solution at 25°C. The quantity of the alloy samples, exposed to temperatures of 50°C, increased after they were submerged as corrosive by-products arose. The corrosion potential was determined via chronopotentiometry, a method where the difference in potential is measured with time. The corrosion potential reached its low-point with the 5 % NaCl solution at 50°C. The results of the polarisation resistance measurements showed that the aluminium alloy 6082 is least affected by steady corrosion when it is exposed to a 1 % solution of NaCl under 25 °C. The shape of the obtained cyclic loop indicated that the aluminium was actively dissolving in the chloride medium. aluminijeva zlitina 6082 kloridni medij potopitveni preskusi elektrokemijska analiza aluminum alloy 6082 chloride medium immersion test electrochemical analysis true true false [A. Baklan] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2016-07-21 14:06:00 2016-09-29 17:08:29 2022-06-25 03:07:41 2019-07-11 12:09:00 2016 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 543.55(043.2) 20373270 URN:SI:UM:DK:UGOTFKGE VS_Baklan_Alenka_2016.pdf VS_Baklan_Alenka_2016.pdf 1 EC0C6E06101FA878552143589ADE8F4C 274145538dee618c2739c037a9f53c0b81dfba68d4746d46ebee2838782bf0be a2ccb7df-7c0d-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=106220 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0