The corrosion behavior of Fe-based shape memory alloys
Journal
Corrosion Science
Journal Volume
44
Journal Issue
9
Pages
2013-2026
Date Issued
2002
Author(s)
Abstract
Fe-30Mn-6Si, Fe-30Mn-6Si-5Cr and Fe-13Mn-5Si-12Cr-5Ni shape memory alloys were prepared by a VIM technique. The various corrosion tests were conducted to investigate the corrosion behaviors of these alloys. Experimental results show that in 3.5% NaCl solution, the Fe-13Mn-5Si-12Cr-5Ni alloy had the best chemical corrosion resistance, whereas the Fe- 30Mn-6Si-5Cr alloy was locally attacked, forming many corrosion pits after immersion test. In addition, the detachment of the corrosion product covering the Fe-30Mn-6Si alloy caused an abrupt increase in the weight loss. After 2 h of heat treatment at 1000 °C, the corrosion potential of the Fe-30Mn-6Si alloy increased due to the formation of α-ferrite, while the Fe- 30Mn-6Si-5Cr alloy became more active. In the stress-corrosion cracking test, the Fe-13Mn- 5Si-12Cr-5Ni alloy, having the highest fracture stress in the atmosphere among these alloys, exhibited the largest decrease in fracture stress in the saturated H2S solution due to the existence of α-martensite. © 2002 Elsevier Science Ltd. All rights reserved.
SDGs
Type
journal article