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Journal of Mining and Metallurgy B: Metallurgy
2019, vol. 55, br. 1, str. 55-63
jezik rada: engleski
vrsta rada: neklasifikovan
objavljeno: 25/04/2019
doi: 10.2298/JMMB181121012V
Creative Commons License 4.0
Korozija pri visokim temperaturama kod komercijalnih FeCrAl legura (Kanthal AF) u prisustvu azota
aHidria d.o.o., Idrija, Slovenia
bInstitute Josef Stefan, Ljubljana, Slovenia
cUniversity of Ljubljana, Faculty of Natural Sciences and Engineering, Slovenia
dUniversity of Ljubljana, Faculty of Chemistry and Chemical Technology, Slovenia

e-adresa: blaz.karpe@omm.ntf.uni-lj.si

Projekat

This work was supported by the Slovenian Research Agency through the project Selective plasma oxidation of alloys, ID L2-8181

Sažetak

U ovom radu je prikazan mehanizam korozije kod komercijalne legure FeCrAl (Kanthal AF) tokom postupka žarenja u prisustvu azota (4,6) na temperaturi od 900°C i 1200°C. Izvedeni su izotermalni i termo-ciklični testovi sa različitim ukupnim vremenom izlaganja, brzinama zagravanja, kao i temperaturama žarenja. Termogravimetrijskom analizom je ispitana oksidacija u kontrolisanoj atmosferi i uz prisustvo azota. Mikrostruktura je ispitana skenirajućim elektronskim mikroskopom (SEM), 'Augerovom' emisijskom spektroskopijom (AES), kao i fokusiranim jonskim zrakom (FIB-EDX). Rezultati pokazuju da se progresija korozije odvija tako što se stvaraju lokalizovani potpovršinski nitracioni delovi koji se sastoje od AlN faznih čestica koje smanjuju aktivnost aluminjuma, pri čemu on postaje krut i dolazi do lomljenja. Postupak stvaranja Al-nitrida i postepen rast Al-oksida zavise od temperature žarenja i brzine zagrevanja. Došlo se do zaključka da se postupak nitracije FeCrAl legure odvija brže od postupka oksidacije tokom žarenja u prisustvu azota pod niskim delimičnim pritiskom kiseonika, i da, samim tim, predstavlja glavni uzrok degradacije legure.

Ključne reči

FeCrAl legure; razmera aluminijuma; oksidacija; nitracija; korozija; AlN faza

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