The Effect of Mn Depleted Surface Layer on the Corrosion Resistance of Shape Memory Fe-Mn-Si-Cr Alloys
Articolo
Data di Pubblicazione:
1997
Citazione:
The Effect of Mn Depleted Surface Layer on the Corrosion Resistance of Shape Memory Fe-Mn-Si-Cr Alloys / G. Coccia Lecis, C. Lenardi, A. Sabatini. - In: METALLURGICAL AND MATERIALS TRANSACTIONS. A, PHYSICAL METALLURGY AND MATERIALS SCIENCE. - ISSN 1073-5623. - 28A:5(1997 May), pp. 1219-1222. [10.1007/s11661-997-0287-z]
Abstract:
In this work, we have examined Fe-Mn-Si-Cr alloys possessing a good shape memory effect due to
a high Mn content (28 wt pct). The addition of Cr (5 wt pct) was made in order to give fairly good
corrosion resistance to the alloy. But we have verified that even in moderately corrosive environ-ments, the presence of chromium does not bear any passivation. On the other hand, we have found
that the alloy can acquire corrosion resistance by means of the formation of a Mn-depleted surface
layer obtained by heating the alloy at high temperature (.10507C) in air. This modified layer forms
since manganese is selectively oxidized with respect to the other components. The adhesion of this
layer is maintained even under severe stress if the thickness of the modified region does not exceed
20mm. Under this limit, the shape memory characteristics of the alloy are not affected, and at the
same time, the specimen acquires properties of passivity comparable with one of the most common
austenitic stainless steels at the presence of the same environmental conditions.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
shape memory, alloys
Elenco autori:
G. Coccia Lecis, C. Lenardi, A. Sabatini
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