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master's thesis
Ispitivanje korozije legure Cu13Al2,5Ni2,5Mn u NaCl otopini
diplomski rad
2017. urn:nbn:hr:167:807854
Gotovac, Ivan
University of Split
Faculty of Chemistry and Technology
Division of Engineering and Chemistry

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Gotovac, I. (2017). Ispitivanje korozije legure Cu13Al2,5Ni2,5Mn u NaCl otopini : diplomski rad (Master's thesis). Split: University of Split, Faculty of Chemistry and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:167:807854

Gotovac, Ivan. "Ispitivanje korozije legure Cu13Al2,5Ni2,5Mn u NaCl otopini : diplomski rad." Master's thesis, University of Split, Faculty of Chemistry and Technology, 2017. https://urn.nsk.hr/urn:nbn:hr:167:807854

Gotovac, Ivan. "Ispitivanje korozije legure Cu13Al2,5Ni2,5Mn u NaCl otopini : diplomski rad." Master's thesis, University of Split, Faculty of Chemistry and Technology, 2017. https://urn.nsk.hr/urn:nbn:hr:167:807854

Gotovac, I. (2017). 'Ispitivanje korozije legure Cu13Al2,5Ni2,5Mn u NaCl otopini : diplomski rad', Master's thesis, University of Split, Faculty of Chemistry and Technology, accessed 16 November 2024, https://urn.nsk.hr/urn:nbn:hr:167:807854

Gotovac I. Ispitivanje korozije legure Cu13Al2,5Ni2,5Mn u NaCl otopini : diplomski rad [Master's thesis]. Split: University of Split, Faculty of Chemistry and Technology; 2017 [cited 2024 November 16] Available at: https://urn.nsk.hr/urn:nbn:hr:167:807854

I. Gotovac, "Ispitivanje korozije legure Cu13Al2,5Ni2,5Mn u NaCl otopini : diplomski rad", Master's thesis, University of Split, Faculty of Chemistry and Technology, Split, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:167:807854

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Metadata
TitleIspitivanje korozije legure Cu13Al2,5Ni2,5Mn u NaCl otopini : diplomski rad
Title (english)Corrosion investigation of Cu13Al2.5Ni2.5Mn alloy in NaCl solution : diploma thesis
AuthorIvan Gotovac
MentorLadislav Vrsalović (mentor)
Committee memberSandra Svilović (predsjednik povjerenstva)
Committee memberIvana Smoljko (član povjerenstva)
Committee memberLadislav Vrsalović (član povjerenstva)
GranterUniversity of Split
Faculty of Chemistry and Technology
(Division of Engineering and Chemistry)
Split
Defense date and country2017-10-17, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
U radu je detaljno analizirano korozijsko ponašanje legure u deaeriranoj 0,9 % NaCl otopini pri pH 3,4, 5,4 i 7,4 te pri temperaturama elektrolita 25, 37 i 50 o C, u mirujućoj otopini i uz miješanje otopine magnetskom miješalicom. Ispitivanje utjecaja pH na koroziju legure provedena je mjerenjem pri pH vrijednostima od 3,4, 5,4 i 7,4 i temperaturi elektrolita od 37 o C. Ispitivanja su provedena elektrokemijskim metodama kao što su praćenje potencijala otvorenog strujnog kruga, metoda linearne i potenciodinamiĉke polarizacije. Rezultati ispitivanja su pokazali da povećanje temperature kao i smanjenje pH vrijednosti elektrolita dovodi do negativiranja potencijala otvorenog strujnog kruga CuAlNiMn legure, porasta gustoće korozijske struje i smanjenja vrijednosti polarizacijskog otpora, dok miješanje elektrolita ne utjeĉe na vrijednost korozijskog potencijala, ali dovodi do porasta gustoće korozijske struje i smanjenja vrijednosti polarizacijskog otpora. Nakon provedenih polarizacijskih ispitivanja, korodirane površine elektroda vizualno su analizirane pomoću optiĉkog mikroskopa uz razliĉita uvećanja. Mikroskopske snimke su pokazale znaĉajna korozijska oštećenja na površini CuAlNiMn legure koja se manifestiraju u vidu svojevrsnog listanja, pri ĉemu je veći dio površine prekriven s listićima korozijskih produkata labavo vezanim za površinu koji se uzdižu s površine elektrode. Na površinama elektroda s kojih su uklonjeni labavo vezani korozijski produkti vidljiva su oštećenja nastala jamiĉastom korozijom. SEM analiza površine otkrila je postojanje dvaju slojeva na površini legure: vanjski izrazito oštećen, koji predstavlja listiće korozijskih produkata labavo vezane za površinu, i unutarnji sloj na kojem su takoĊer vidljiva znaĉajna korozijska oštećenja. EDS analizom odreĊen je elementarni sastav korozijskih produkata na površini uzoraka.
Abstract (english)
The corrosion behavior of the alloy in deaerated 0.9% NaCl solution at pH 3,4, 5,4 and 7,4 and temperatures of 25, 37 and 50 o C, in a still solution and in stirring solution with a magnetic stirrer was investigated. The influence of solution pH on alloy corrosion were investigated in solution pH of 3,4, 5,4 and 7,4 at 37 o C. The measurements were conducted by electrochemical methods such as monitoring the open circuit potential, linear and potentiodynamic polarization methods. The results of the investigations have shown that increasing the temperature as well as decreasing the pH of the electrolyte leads to the negation of the open circuit current of the CuAlNiMn alloy, the increase of the corrosion current density and decrease of the polarization resistance values, while electrolyte stirring does not affect the corrosion potential but increases the corrosion current density and decreases the value of polarization resistance. After the polarization measurements, the corroded electrode surface was examined using an optical microscope with different magnifications. Microscopic images have shown the significant corrosion damages on the CuAlNiMn alloy surface, which manifests itself in the form of a thin leaf, with a larger part of the surface being covered with sheets of corrosion products loosely bonded to the surface which were rised from the surface of the electrode. Clean electrode surfaces from which corrosion products are removed have visible damage caused by pitting corrosion. SEM surface analysis revealed the existence of two layers on the surface of the alloy: the exterior is extremely damaged, which represent sheets of loosely bonded surface, and an inner layer that also shows significant corrosion damage. The elemental composition of corrosion products on the surface of the samples was determined by EDS analysis.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:167:807854
ProjectNumber: IP-2014-09-3405
Title: Dizajniranje mikrostrukture i funkcionalnih svojstava legura s prisjetljivosti oblika na bazi bakra
Acronym: DMFP-CuSMA
Leader: Mirko Gojić
Jurisdiction: Croatia
Funder: HRZZ
Funding stream: IP
Study programmeTitle: Chemical Technology; specializations in: Materials, Environmental Protection, Mediteranean Cultures
Course: Materials
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Public noteKljučne riječi doradio knjižničar/ Key words are revised by the librarian
Created on2018-03-22 11:43:35