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master's thesis
Korozijska postojanost nanostrukturiranih tvrdih metala
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2016. urn:nbn:hr:235:249156
Majdak, Ivan
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Institutional repository: Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb

Cite this document

Majdak, I. (2016). Korozijska postojanost nanostrukturiranih tvrdih metala (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:249156

Majdak, Ivan. "Korozijska postojanost nanostrukturiranih tvrdih metala." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2016. https://urn.nsk.hr/urn:nbn:hr:235:249156

Majdak, Ivan. "Korozijska postojanost nanostrukturiranih tvrdih metala." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2016. https://urn.nsk.hr/urn:nbn:hr:235:249156

Majdak, I. (2016). 'Korozijska postojanost nanostrukturiranih tvrdih metala', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 11 August 2024, https://urn.nsk.hr/urn:nbn:hr:235:249156

Majdak I. Korozijska postojanost nanostrukturiranih tvrdih metala [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2016 [cited 2024 August 11] Available at: https://urn.nsk.hr/urn:nbn:hr:235:249156

I. Majdak, "Korozijska postojanost nanostrukturiranih tvrdih metala", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2016. Available at: https://urn.nsk.hr/urn:nbn:hr:235:249156

Metadata
TitleKorozijska postojanost nanostrukturiranih tvrdih metala
Title (english)Corrosion resistance of nanostructured hardmetals
AuthorIvan Majdak
MentorŽeljko Alar (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2016-07-14, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Basic Technical Sciences
Materials
Abstract
Smanjivanjem veličine zrna tvrdog metala na nano razinu, dolazi do poboljšanja mehaničkih, ali i ostalih svojstava. Danas postoji nekoliko tehnologija kojima je moguće konsolidirati nanostrukturiran tvrdi metal. Najveći problem postizanja nano veličine zrna kod tvrdih metala je kontrola parametara koji utječu na rast istog tokom procesa sinteriranja. Isto tako, postavlja se pitanje kako nano veličina zrna utječe na korozijsku postojanost samog tvrdog metala. Da bi se to uvrdilo, potrebno je provest elektrokemijska ispititvanja u svrhu određivanja parametara korozije i analizirati ponašanje materijala u elektrolitu određene pH- vrijednosti. U radu je analizirano osam uzoraka nanostrukturiranih WC-Co tvrdih metala, u cilju utvrđivanja njihove korozijske postojanosti. Uzorci su dobiveni konsolidacijom tri različita nano praha, različitih udjela WC i Co i različitim postupcima sinteriranja. Elektrokemijskim tehnikama određeni su korozijski parametri uzoraka; korozijski potencijal (Ecorr), gustoća korozijske struje (jcorr) i polarizacijski otpor (Rp). Ispitivanja su provedena u 3,5%-tnoj NaCl otopini pri sobnoj temperaturi.
Abstract (english)
Reducing the size of a carbide grain to a nano level, there is an improvement of mechanical and other properties. Today there are several technologies that can consolidate nanostructured hardmetal. The biggest problem of achieving nano-sized grains is parameters control which influence the growth of grain during the sintering process. Similarly, there is a question how nano grain size affects to the corrosion resistance of hardmetal. To identify that, it is necessary to perform electrochemical testings to determine the corrosion parameters and analyze the behavior of materials in the electrolyte of certain pH value. In this paper, eight samples of nanostructured WC-Co hardmetal were analyzed in order to determine their corrosion stability. Samples were obtained by consolidation of three different nano powders, with different contents of WC and Co and different sintering processes. Corrosion parameters like corrosion potential (Ecorr), corrosion current density (jcorr) and polarization resistance (Rp) were determinated by electrochemical techniques. Measurements were perfomed in 3,5% NaCl solution at room temperature.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:249156
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2019-05-22 16:53:13