Different corrosion behaviour of CuNi10Fe1Mn alloy condenser tubes in seawater

Stručni rad - Stručni rad

• Autor: Zvonimir Dadić; MBZ: 338112
• Autor: Senka Gudić; MBZ: 181062
• Autor: Ladislav Vrsalović; MBZ: 237626
• Autor: Dario Kvrgić
• Autor: Ivana Ivanić; MBZ: 335063
• Autor: Nikša Čatipović; MBZ: 340792
• Autorova ustanova: Sveučilište u Splitu; Fakultet elektrotehnike, strojarstva i brodogradnje
• Autorova ustanova: Sveučilište u Splitu; Kemijsko-tehnološki fakultet
• Autorova ustanova: Sveučilište u Zagrebu; Metalurški fakultet
• Znanstveno / umjetničko područje, polje i grana: TEHNIČKE ZNANOSTI; Metalurgija
• Znanstveno / umjetničko područje, polje i grana: TEHNIČKE ZNANOSTI; Kemijsko inženjerstvo
• Znanstveno / umjetničko područje, polje i grana: TEHNIČKE ZNANOSTI; Strojarstvo

Sažetak (engleski)

Two CuNi10Fe1Mn condenser tube samples from boat heat exchangers were investigated due to their different corrosion behaviour in exploitation. One tube was in exploitation nearly 20 years before significant corrosion damage occurred (sample 1), while second tube of different manufacturer showed corrosion damages in 2 months of exploitation (sample 2). In its working conditions seawater was passing through the pipes and R407C gas around the pipes. Chemical analysis, microstructural and hardness investigations and laboratory electrochemical investigations of corrosion behaviour of samples in sea water were performed in order to determine the main reason for different durability of condenser tubes. After electrochemical investigations the polarization surface damage was verified by SEM analysis. Both samples belong to the CuNi10Fe1Mn alloy system with the significant difference in the mass fraction of iron content (around 30% higher for sample 1). Samples coincide in the structural sense (type and size of grain) and in mechanical properties (hardness of 133 HV1). Fe content in the CuNi10Fe1Mn alloy has the key role in the corrosion behaviour of the tested samples. It has been found that (regardless of the temperature of the heat exchanger) the corrosion resistance of the tested samples increases with increasing Fe content in the alloy. Namely, the corrosion current decreases in same order, while the polarization resistance and properties of surface oxide layer increase. SEM analysis confirmed less damage on the surface of samples with higher Fe content.

• Ključne riječi (engleski): CuNi10Fe1Mn; Corrosion; Microstructure; Polarization; SEM/EDS analysis
• Jezik: engleski
• Vrsta publikacije: Stručni rad - Stručni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov zbornika: Mechanical Technologies and Structural Materials 2019 Conference proceedings
• Brojčani podaci: str. 25-31
• p-ISSN: 1847-7917
• URN:NBN: urn:nbn:hr:115:977236
• Datum objave publikacije: 2019
• Skup: Naziv: Mechanical technologies and structular materials 2019; Lokacija: Split, Hrvatska; Datum početka: 2019-09-26; Datum završetka: 2019-09-27; Vrsta izlaganja: Predavanje
• URL dokumenta: http://bib.irb.hr/1023363
• Vrsta resursa: Tekst
• Izdavač: Croatian Society For Mechanical Technologies
• Mjesto izdavanja: Split
• Prava pristupa: Otvoreni pristup
• Datum i vrijeme pohrane: 2019-12-16 07:15:49