Korozija armaturnog čelika zaštićenog prevlakom legure Zn-Ni u elektrolitima koji simuliraju pore u betonu
Sažetak
Uvod/cilj: Antikorozivna zaštita čelične armature u betonu predstavlja ključni izazov u građevinarstvu, naročito u izgradnji betonskih konstrukcija namenjenih za vojne svrhe. Trenutno, najvažnije metode za postizanje ove zaštite uključuju primenu epoksidnih ili toplocinkovanih prevlaka, upotrebu armature od nerđajućeg čelika ili kompozitnih materijala, ili betona koji sadrži inhibitore korozije, površinske zaptivače, silicijumsku prašinu ili dodatak letećeg pepela.
Metode: Ova studija ima za cilj da utvrdi da li prevlaka od legure Zn-Ni odgovarajuće debljine, naneta elektrohemijskim taloženjem, može dati bolju i dugotrajniju otpornost na koroziju armaturnog čelika u betonu, u poređenju sa tradicionalnom prevlakom Zn koja se obično primenjuje u tu svrhu. Nanete prevlake Zn-Ni bile su debljine 40 µm i sadržale su oko 13 mas. % Ni.
Rezultati: Snimanje elektronskim mikroskopom otkrilo je da su prevlake imale glatku i homogenu morfologiju, iako su pokazivale mikropukotine koje su se protezale kroz celu njihovu dubinu. Zaštitna efikasnost prevlake ocenjena je elektrohemijskom impedancijskom spektroskopijom, pri čemu su uzorci bili potopljeni u različite elektrolite koji simuliraju hemijske uslove prisutne u različitim vrstama betona. Merenja su pokazala znatno manju brzinu rastvaranja produkta korozije formiranog na prevlaci Zn-Ni u elektrolitu bogatom hloridima, u poređenju sa čistim Zn.
Zaključak: Može se zaključiti da legura Zn-Ni predstavlja održivu alternativu čistom Zn, za zaštitu čelika u betonskim konstrukcijama gde se očekuje visoka penetracija hlorida.
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