Corrosion behavior of Ni3Al-bonded TiC-based cermets in H2SO4 and NaOH solutions. Issue 11 (1st August 2018)

• Record Type: Journal Article
• Authors: Mao, Qiao; Yang, Qingqing; Xiong, Weihao; Li, Shengtao; Zhang, Man; Ruan, Linji
• Is Part Of: Ceramics international. Volume 44:Issue 11(2018)
• Page Start: 13303
• Page End: 13312
• Publication Date: 2018-08-01
• Subjects: Ti(C, N)-based cermets -- Ni3Al -- Corrosion behavior -- H2SO4 solution -- NaOH solution; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.04.161
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Corrosion behavior of multicomponent Ni3 Al-bonded Ti(C, N)-based cermets with various Ni3 Al contents and Ti(C0.5, N0.5 ) addition was investigated in 1 M H2 SO4 and 1 M NaOH solutions, using immersion tests, potentiodynamic polarization measurements, XRD, SEM and XPS. In 1 M H2 SO4 solution, corrosion process of all cermets consisted mainly of their binder phase dissolution, and during potentiodynamic polarization, their passivation and pseudo-passivation corresponded to passivation of their binder phase and ceramic grains, respectively. Corrosion potential and current density decreased with increasing Ni3 Al content, while corrosion potential increased and current density decreased with Ti(C0.5, N0.5 ) addition. In 1 M NaOH solution, corrosion process of all cermets consisted mainly of their ceramic grain dissolution, and during potentiodynamic polarization, their passivation and pseudo-passivation corresponded to passivation of their ceramic grains and binder phase, respectively. Corrosion potential increased and current density decreased with increasing Ni3 Al content, while corrosion potential decreased and current density increased with Ti(C0.5, N0.5 ) addition.