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Zaštita materijala
2020, vol. 61, br. 1, str. 41-51
jezik rada: engleski
vrsta rada: naučni članak
objavljeno: 27/03/2020
doi: 10.5937/zasmat2001041R
Creative Commons License 4.0
Koroziona svojstva laserski čišćenih površina na artefaktu od gvožđa
aUniverzitet u Beogradu, Institut za hemiju, tehnologiju i metalurgiju - IHTM
bCentral Institute for Conservation, Belgrade

e-adresa: bojana.radojkovic@ihtm.bg.ac.rs

Projekat

Istraživanje i optimizacija tehnoloških i funkcionalnih performansi ventilacionog mlina termoelektrane Kostolac B (MPNTR - 34028)
Razvoj triboloških mikro/nano dvokomponentnih i hibridnih samopodmazujućih kompozita (MPNTR - 35021)

Sažetak

U ovom radu, Nd:YAG laser je korišćen za čišćenje površina artefakata od gvožđa koji su bili prekriveni korozionim produktima. Korozioni produkti su uklonjeni bez oštećivanja osnovnog materijala. Za određivanje brzine korozije mehanički čišćene površine, laserski čišćene površine i laserski čišćene površine na koju je nakon čišćenja nanesen zaštitni sloj Paraloid B44, korišćene su tri različite elektrohemijske metode. Morfologija čišćenih površina je ispitivana SEM mikroskopijom. Metoda linearne polarizacione otpornosti, elektrohemijska impedansna spektroskopija i voltametrija sa linearnom promenom potencijala pokazale su da je brzina korozije laserski čišćene površine uzorka od gvožđa za oko 50% veća od brzine korozije mehanički čišćene površine. Elektrohemijska impedansna spektroskopija je pokazala da otpornost pora Paraloid prevlake na laserski čišćenoj površini uzorka opada na početku ispitivanja nakon čega dostiže konstantnu vrednost. Na početku ispitivanja, vrednost otpornosti razmeni elektrona je konstantna nakon čega naglo opada, tj. brzina korozije gvožđa u porama Paraloid prevlake raste sa vremenom. Tokom ispitivanja tehnikom voltametrije sa linearnom promenom potencijala na uzorku od gvožđa sa Paraloid prevlakom, zapaženo je da anodna kriva polarizacije ima neuobičajen oblik pri potencijalima pozitivnijim od - 0.5 V.

Ključne reči

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