Hot Corrosion Behavior of SiO2-Al2O3-Glass Composite Coating on Ti-47Al-2Cr-2Nb Alloy: Diffusion Barrier for S and Cl

doi:10.1007/s40195-018-0842-1

Abstract

Abstract:

Type I hot corrosion behavior of SiO₂-Al₂O₃-glass composite coating based on Ti-47Al-2Cr-2Nb substrate was investigated in the mixture salt of 25 wt%NaCl + 75 wt%Na₂SO₄ at 850 °C. The results showed that there was a bidirectional ion exchange between composite coating and the film of mixed salts, and the sodium ion in the molten salts penetrated into the glass matrix of composite coating, while the potassium ion in the glass matrix dissolved into the molten salts. A decrease in hot corrosion rate was achieved for the coated alloy in comparison with the bared substrate due to the composite coating acting as a diffusion barrier to sulfur and chlorine and preventing the molten salts from diffusing to the coating/alloy interface during the hot corrosion exposure. Additionally, the composite coating decreased the oxygen partial pressure at the coating/alloy interface and promoted the selective oxidation of Al to form a protective Al₂O₃ layer.

Key words: Corrosion, Composite coating, Ti-47Al-2Cr-2Nb alloy, Diffusion

Wen-Bo Li, Lan-Lan Liu, Ying-Fei Yang, Sheng-Long Zhu, Fu-Hui Wang. Hot Corrosion Behavior of SiO₂-Al₂O₃-Glass Composite Coating on Ti-47Al-2Cr-2Nb Alloy: Diffusion Barrier for S and Cl[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(5): 599-606.

Figures/Tables 7

Fig. 1 Optical images of the bare a and coated b Ti-47Al-2Cr-2Nb alloy after 100 h hot corrosion at 850 °C

Fig. 2 Hot corrosion kinetics of Ti-47Al-2Cr-2Nb alloy with and without the SiO2-Al2O3-glass composite coating at 850 °C

Fig. 3 XRD patterns of the bare Ti-47Al-2Cr-2Nb alloy a and alloy with SiO2-Al2O3-glass composite coating b after 100 h hot corrosion at 850 °C

Fig. 4 Surface morphology a, cross-sectional image b and line scanning results of the cross section c of the bare Ti-47Al-2Cr-2Nb alloy after 100 h hot corrosion at 850 °C

Fig. 5 Surface morphology a, cross-sectional image b and line scanning results of the cross section c of the Ti-47Al-2Cr-2Nb alloy with SiO2-Al2O3-glass composite coating after 100 h hot corrosion at 850 °C

Fig. 6 Element mapping (Al, O, Ti, Si, Na, K, S) for the Ti-47Al-2Cr-2Nb alloy with SiO2-Al2O3-glass composite coating after 100 h hot corrosion at 850 °C

Fig. 7 Schematic diagram of the hot corrosion behavior of the SiO2-Al2O3-glass composite coating on Ti-47Al-2Cr-2Nb alloy

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Hot Corrosion Behavior of SiO₂-Al₂O₃-Glass Composite Coating on Ti-47Al-2Cr-2Nb Alloy: Diffusion Barrier for S and Cl

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