Corrosion behavior of select MAX phases in NaOH, HCl and H2SO4 |
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| Authors: | VD Jovic BM Jovic S Gupta T El-Raghy MW Barsoum |
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| Affiliation: | aCenter for Multidisciplinary Studies, University of Belgrade, 11030 Belgrade, P.O. Box 33, Serbia and Montenegro;bDepartment of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, United States;c3-ONE-2, LLC, Voorhees, NJ, United States |
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| Abstract: | In this paper we report on the electrochemical corrosion of select MAX phases, namely Ti2AlC, (Ti,Nb)2AlC, V2AlC, V2GeC, Cr2AlC, Ti2AlN, Ti4AlN3, Ti3SiC2 and Ti3GeC2 in 1 M NaOH, 1 M HCl and 1 M H2SO4 solutions. Polarization characteristics recorded in 1 M NaOH show that V2AlC, V2GeC and Cr2AlC undergo active dissolution at potentials more positive than the corrosion potential, while Ti2AlC, (Ti,Nb)2AlC, Ti3SiC2 and Ti3GeC2 passivate. In the 1 M HCl solutions, Ti2AlC, V2AlC and V2GeC actively dissolve; Ti3SiC2 and Ti3GeC2 passivate. Depending on potential, (Ti,Nb)2AlC and Cr2AlC showed trans-passive behavior. In 1 M H2SO4 solutions, Ti2AlC, (Ti,Nb)2AlC, Ti3SiC2 and Ti3GeC2 passivate, V2AlC and V2GeC show active dissolution, while Cr2AlC exhibits trans-passive behavior. Ti2AlN and Ti4AlN3 were passive in all solutions except in 1 M HCl, where Ti2AlN showed trans-passive behavior. Given that the corrosion behavior of (Ti,Nb)2AlC is unlike either Ti or Nb, the behavior of the former cannot be predicted from that of the latter. |
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| Keywords: | MAX phases Ti Nb Ti2AlC V2GeC (Ti Nb)2AlC V2AlC Cr2AlC Ti2AlN Ti4AlN3 Ti3SiC2 Ti3GeC2 Passivity Active dissolution Trans-passive behavior NaOH HCl H2SO4 |
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