Naslov
Corrosion alumina ceramics in nitric acid

Autori
Ćurković, Lidija ; Ropuš, Ivana ; Gabelica, Ivana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
1st International Conference of the Croatian Ceramic Society (CroCerS): Advanced Ceramics in Derivative Configurations (1st ACDC 2023) / Mandić, Vilko - Zagreb : Fakultet kemijskog inženjerstva i tehnologije Sveučilišta u Zagrebu, 2023, 34-34

ISBN
978-953-6470-99-0

Skup
Advanced Ceramics in Derivative Configurations (1st ACDC 2023)

Mjesto i datum
Dubrovnik, Hrvatska, 26.04.2023. - 29.04.2023

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
alumina ; corrosion activation energy ; corrosion rate

Sažetak
In this study, the corrosion behaviour of alumina ceramics was observed under different conditions: 0.5, 1.25 and 2 mol dm–3 of nitric acid at 25, 40 and 55 °C through 10 days. The results show that Al2O3 ceramics exhibit good corrosion resistance at higher HNO3 concentration. Al2O3 corrosion behaviour varies depending on the temperature, time and HNO3 concentration. In view of the reaction kinetics, it proceeds in the parabolic law in HNO3 aqueous solution and decreases with increase of the HNO3 concentration. The corrosion rate and activation energy were calculated and compared for all experimental conditions. It was found that the corrosion rate of Al2O3 was found to be in the range 0.08 - 0.34 µg2 cm–4 h–1 where the highest rate was achieved at lower HNO3 concentration and highest temperature. Finally, the highest activation energy was determined for the 0.50 mol dm–3HNO3 concentration, which was more than twice as high as the activation energy observed at the 2.00 mol dm–3 HNO3 concentration.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Strojarstvo, Temeljne tehničke znanosti

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