Oxidation and hot corrosion behaviors of MAX-phase Ti3SiC2, Ti2AlC, Cr2AlC

Li, Xiaojing; Wang, Shunhua; Wu, Guixuan; Zhou, Dapeng; Pu, Jibin; Yu, Miao; Wang, Qiong; Sun, Qinshuo

doi:10.1016/j.ceramint.2022.05.356

Cited by 35 publications

(7 citation statements)

References 55 publications

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“…Notably, the Al concentration was remarkably higher than that of Cr, identifying that the passive film was dominated by aluminum oxides, in accordance with previous studies. 39,40 Most importantly, the thickness of the generated passive film in the (Cr 0.9 , Mo 0.1 ) 2 AlC coating was about 50 nm, larger than that of the Cr 2 AlC coating at ∼35 nm (Figure 6b,c). This strengthened passivation could account for the improvement of corrosion resistance by Mo solid solution.…”

Section: The Journal Of Physical Chemistry Cmentioning

confidence: 96%

Electrochemical Corrosion Inhibition of Cr₂AlC MAX Phase Coatings via Mo Solid Solution: Comprehensive Experimental and Simulation Study

Zhang,

et al. 2024

J. Phys. Chem. C

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The Cr 2 AlC MAX phase has gained increasing interest as a protective coating used in harsh high-temperature oxidation and moltensalt corrosion. However, these coatings are easily apt to fail at room temperature due to the poor electrochemical corrosion resistance. Taking the concept of M-site solid solution, herein, (Cr 0.9 , Mo 0.1 ) 2 AlC solid solution coatings were specially fabricated by a combined technique composed of magnetron sputtering and subsequent heat treatment. The dependence of electrochemical behavior on the structural evolution was focused by comprehensive simulations and experiments. Results showed that the structure of (Cr, Mo) 2 AlC solid solutions was stable regardless of the Mo concentration. Moreover, compared to pristine Cr 2 AlC coating, the corrosion current density was reduced and the electric impedance was enhanced by almost 1 order magnitude in 3.5 wt % NaCl solution, respectively. This was mainly ascribed to the accelerated passivation layer rich in aluminum oxides on the coating surface. Based on density functional theory simulation, the partial substitution of Mo for Cr in Cr 2 AlC favored the stronger mobility of Al atoms because of the reduction in vacancy formation energy, leading to the rapid growth of passivation of aluminum oxides substantially. The observations not only provide conducive evidence of Mo solid solution for the enhanced corrosion inhibition in Cr 2 AlC MAX phase coating but also offer an alternative strategy to enable the electrochemical performance of protective coatings with extended long-life serving.

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Section: The Journal Of Physical Chemistry Cmentioning

confidence: 96%

Electrochemical Corrosion Inhibition of Cr₂AlC MAX Phase Coatings via Mo Solid Solution: Comprehensive Experimental and Simulation Study

Zhang,

et al. 2024

J. Phys. Chem. C

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“…The results indicated that the Ti 3 SiC 2 substrate was covered by a densified SiC layer, which delayed the corrosion of the substrate. Moreover, Li et al 28 . analyzed the hot‐corrosion resistance of Ti 3 SiC 2 , Ti 2 AlC, and Cr 2 AlC at high temperature and they found that Ti 3 SiC 2 exhibited the best hot‐corrosion resistance among them.…”

Section: Introductionmentioning

confidence: 99%

“…The results indicated that the Ti 3 SiC 2 substrate was covered by a densified SiC layer, which delayed the corrosion of the substrate. Moreover, Li et al 28 analyzed the hot-corrosion resistance of Ti 3 SiC 2 , Ti 2 AlC, and Cr 2 AlC at high temperature and they found that Ti 3 SiC 2 exhibited the best hot-corrosion resistance among them. The related reason was that the corrosion product of Ti 3 SiC 2 was composed of TiO 2 , SiO 2 , and Na 2 TiO 3 , which benefited the hot-corrosion resistance of Ti 3 SiC 2 .…”

Section: Introductionmentioning

confidence: 99%

Corrosion behaviors of Ti₃SiC₂/Cu composites in molten salts

Liu,

Du,

et al. 2024

Int J Applied Ceramic Tech

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The corrosion behaviors of Ti3SiC2/Cu composites synthesized by spark plasma sintering technique were investigated at 900°C in three molten salts including NaCl, Na2SO4, and Na2CO3, and the related corrosion mechanism was discussed. The morphology and composition of the composites after corrosion were characterized by scanning electron microscopy and X‐ray photoelectron spectroscopy. The results indicated that the weight gain per unit surface area of the composites was negative in molten Na2CO3, while it was positive and relatively small in molten NaCl and Na2SO4. The high weight loss of the composites in molten Na2CO3 was owing to that in molten Na2CO3, an oxidation layer of the composites was dissolved, and oxygen diffused through the layer to corrode the substrate inside. Thus, in the molten Na2CO3, the composites exhibited a worse corrosion resistance. However, in molten NaCl and Na2SO4, an oxidation layer containing SiO2 and TiO2 was formed on the surface of the composites, inhibiting its further corrosion. Conclusively, the composites showed better corrosion resistance in molten NaCl and Na2SO4.

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“…As demonstrated by Song et al., [5c] extraction of Al atoms at the edges of Ti 3 AlC 2 occurred at the early stage of oxidation, and the different growth rates between TiO 2 and A 2 O 3 led to the multi‐layered structure. When turning to the Ti 3 SiC 2 , the multi‐layered structure of the oxide scale was also observed, [4a,e, 7] but the formation mechanism is quite different from that of Ti 3 AlC 2 . For instance, only a single layer of the mixture of TiO 2 and SiO 2 was observed below 1000 °C, while a multi‐layered structure can only be found above 1100 °C.…”

Section: Introductionmentioning

confidence: 99%

Effect of Si on the Oxidation Behaviors of Ti₃Al_1−xSi_xC₂ at 1000 °C

Yang

Zeng

et al. 2023

Chemistry A European J

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In this work, Ti3Al1−xSixC2 (x=0, 0.2, 0.4, and 0.6) with Al/Si solid solution structure are synthesized, and the effects of Si on their oxidation behaviors at 1000 °C are evaluated. The addition of Si not only contributes to the formation of Ti5Si3 impurity but also affects the composition of the oxide scale. Particularly, the incorporation of Si in the TiO2 lattice is demonstrated, which alters the formation energy of the (110) plane in TiO2, thus leading to the preferential growth of Si‐doped TiO2 to dendritic congeries. Moreover, the Si addition is believed to affect mass transportation during the oxidation process, which accelerates the formation of a continuous Al2O3 layer in the oxide scale. With an optimized Si content, the oxidation of Ti3Al1−xSixC2 is restrained. However, with excess Si content, the continuity of the resulting Al2O3 layer is destroyed, thus the oxidation rate rises again.

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Oxidation and hot corrosion behaviors of MAX-phase Ti3SiC2, Ti2AlC, Cr2AlC

Cited by 35 publications

References 55 publications

Electrochemical Corrosion Inhibition of Cr₂AlC MAX Phase Coatings via Mo Solid Solution: Comprehensive Experimental and Simulation Study

Electrochemical Corrosion Inhibition of Cr₂AlC MAX Phase Coatings via Mo Solid Solution: Comprehensive Experimental and Simulation Study

Corrosion behaviors of Ti₃SiC₂/Cu composites in molten salts

Effect of Si on the Oxidation Behaviors of Ti₃Al_1−xSi_xC₂ at 1000 °C

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Oxidation and hot corrosion behaviors of MAX-phase Ti3SiC2, Ti2AlC, Cr2AlC

Cited by 35 publications

References 55 publications

Electrochemical Corrosion Inhibition of Cr2AlC MAX Phase Coatings via Mo Solid Solution: Comprehensive Experimental and Simulation Study

Electrochemical Corrosion Inhibition of Cr2AlC MAX Phase Coatings via Mo Solid Solution: Comprehensive Experimental and Simulation Study

Corrosion behaviors of Ti3SiC2/Cu composites in molten salts

Effect of Si on the Oxidation Behaviors of Ti3Al1−xSixC2 at 1000 °C

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Electrochemical Corrosion Inhibition of Cr₂AlC MAX Phase Coatings via Mo Solid Solution: Comprehensive Experimental and Simulation Study

Electrochemical Corrosion Inhibition of Cr₂AlC MAX Phase Coatings via Mo Solid Solution: Comprehensive Experimental and Simulation Study

Corrosion behaviors of Ti₃SiC₂/Cu composites in molten salts

Effect of Si on the Oxidation Behaviors of Ti₃Al_1−xSi_xC₂ at 1000 °C