Korozijska svojstva vanjske površine i poprečnog presjeka aluminijske legure dobivene postupkom aditivne proizvodnje električnim lukom i žicom oznake MA-6063

master's thesis

• Title (english): Corrosion properties of the outer surface and cross-section of the aluminum alloy obtained by wire marked MA-6063 and arc additive manufacturing
• Author: Nina Oljača
• Mentor: Marin Kurtela (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2025-02-06, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

Pri zavarivanju aluminija preporuča se korištenje dodatnog materijala jednakog ili sličnog
kemijskog sastava kako bi konačna svojstva bila optimalna. Uzorci ispitivani u ovom radu
izrađeni su aditivnom proizvodnjom električnim lukom i žicom (WAAM). Žica je komercijalno
dostupan dodatni materijal oznake MA-6063. Dodatkom čestica Ti5B1 pouzdano se može
spriječiti nastanak vrućih pukotina, koje su česta pojava kod WAAM postupka zavarivanja zbog
visokog unosa topline. Korištena žica ima cca. 0,30% sadržaj tih čestica.
Eksperimentom u ovom radu ispituje se korozijska postojanost dobivenih uzoraka, s posebnim
naglaskom na otpornost na rupičastu koroziju. Rupičasta korozija opasan je tip korozije koji
nastaje neprimjetno i brzo. Elektrokemijskim ispitivanjima (elektrokemijska impedancijska
spektroskopija i ciklička polarizacija) i ispitivanjima u slanoj komori doneseni su zaključci o
korozijskom ponašanju ove aluminijske legure. Također je uzet u obzir različit unos topline u
slojevitoj proizvodnji WAAM procesom, koji znatno utječe na različitost mikrostrukture i
mehaničkih svojstava, te uspoređena mjerenja na različitim područjima uzoraka.

Abstract (english)

When welding aluminum, it is recommended to use filler material with identical or similar
chemical composition to ensure optimal final properties. The samples examined in this study
were produced by Wire Arc Additive Manufacturing (WAAM) using an electric arc and wire.
The wire used is a commercially available filler material labeled MA-6063. By adding Ti5B1
particles, the occurrence of hot cracking, also known as solidification cracking, which are a
common issue in the WAAM welding process due to high heat input, can be reliably prevented.
The wire contains approximately 0.30% of these particles.
This study investigates the corrosion resistance of the obtained samples, with a particular focus
on resistance to pitting corrosion. Pitting corrosion is a dangerous type of corrosion that occurs
unnoticed and progresses rapidly. Conclusions about the corrosion behavior of this aluminum
alloy were drawn through electrochemical tests (electrochemical impedance spectroscopy and
cyclic polarization) and salt spray chamber testing. The study also considered the varying heat
input in the layered production process of WAAM, which significantly affects the
microstructure and mechanical properties, and compared measurements across different areas
of the samples.

• Keywords: Aditivna proizvodnja električnim lukom i žicom; aluminij; rupičasta korozija; elektrokemijska impedancijska spektroskopija; ciklička polarizacija; slana komora.
• Keywords (english): Wire Arc Additive Manufacturing (WAAM); aluminum; pitting corrosion; electrochemical impedance spectroscopy; cyclic polarization; salt spray chamber.
• Language: croatian
• URN:NBN: urn:nbn:hr:235:935335
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering, Mechanics and Robotics, Autonomous Systems, Mechatronics and Robotics; Course: Production Engineering; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva (sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-02-05 12:15:41