The corrosion behavior of Fe-based shape memory alloys |
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| Authors: | H.C. Lin K.M. LinC.S. Lin T.M. Ouyang |
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| Affiliation: | a Department of Materials Science, Feng Chia University, 100 Wenhwa Road, Taichung 407, Taiwan, ROC
b Department of Mechanical Engineering, Da Yeh University, Changhua, Taiwan, ROC |
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| 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. |
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| Keywords: | Fe-based shape memory alloys Chemical corrosion Electrochemical corrosion C. Stress corrosion |
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