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Corrosion behavior of shape memory stainless steel in acid media |
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| Authors: | CA Della Rovere JH AlanoJ Otubo SE Kuri |
| Affiliation: | a Department of Materials Engineering, Federal University of São Carlos, Rodovia Washington Luis, Km 235, 13565-905 São Carlos, SP, Brazil b Division of Mechanical Engineering, Technological Institute of Aeronautics, Praça Marechal Eduardo Gomes, 50. Vila das Acácias, 12228-900 São José dos Campos, SP, Brazil |
| Abstract: | The corrosion behavior of three Fe-Mn-Si-Cr-Ni-(Co) shape memory stainless steels (SMSS) in 0.5 M H2SO4 solution was studied through electrochemical and immersion tests. The test results were compared with that of a type 304 (SS 304) austenitic stainless steel. The three SMSSs exhibited a passive behavior in 0.5 M H2SO4 solution; however, their anodic behavior in the active dissolution region was markedly different. The passive current densities of the SMSSs were similar to that of SS 304, although the critical anodic current required for passivation was higher. The corrosion rate of the SMSSs was much higher than that of SS 304. It was observed that the amount of Cr and Mn plays an important role in the corrosion behavior of SMSSs. The best corrosion behavior in acid media was shown by the SMSS that contained the highest amount of Cr and the lowest amount of Mn. |
| Keywords: | Shape memory alloys Fe-Mn-Si-Cr-Ni-(Co) shape memory stainless steel Corrosion Electrochemical techniques Immersion tests |
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