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COMPORTAMENTO A CORROSIONE E TRIBOCORROSIONE DI RIVESTIMENTI CERMET E CERMET/ SUPERLATTICE

Authors: MONTICELLI, Cecilia; ZUCCHI, Fabrizio;

COMPORTAMENTO A CORROSIONE E TRIBOCORROSIONE DI RIVESTIMENTI CERMET E CERMET/ SUPERLATTICE

Abstract

È stato studiato il comportamento a corrosione e tribocorrosione di riporti cermet e cermet/superlattice,applicati su campioni di acciaio. I riporti cermet consistono in riporti termici HVOF a spessore,di tipo WC-12Co o Cr3C2-37WC-18Me. I doppi riporti cermet/superlattice sono ottenuti sovrapponendoai depositi cermet citati un superlattice a base di nitruri, in cui si alternano strati di CrN e di NbN. Unasoluzione al 3.5 % di NaCl costituisce l’ambiente aggressivo. Le condizioni di tribocorrosione sono realizzateinducendo usura per strisciamento ad opera di un antagonista in allumina, durante l’esposizionestessa all’ambiente aggressivo.Tramite registrazione di curve di polarizzazione dopo 1 ora di esposizione e monitoraggio della resistenzadi polarizzazione fino a 3 giorni di esposizione è possibile evidenziare che fra i riporti cermet è il Cr3C2-37WC-18Me a fornire la migliore resistenza a corrosione, almeno a tempi brevi di esposizione, mentre entrambii riporti termici soffrono di elevate velocità di degrado, in condizioni di tribocorrosione. Il doppio riportoWC-12Co/superlattice offre invece prestazioni assai promettenti sia in condizioni di libera corrosioneche di tribocorrosione, entro i 3 giorni di prova.

Country
Italy
Related Organizations
Keywords

acciaio; corrosione; rivestimenti; tribologia

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
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