当前位置: X-MOL 学术Oxid. Met. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
High-Temperature Corrosion of Ti-46Al-6Nb-0.5 W-0.5Cr-0.3Si-0.1C Alloy in Ar/0.2%SO2 Gas
Oxidation of Metals ( IF 2.1 ) Pub Date : 2020-07-01 , DOI: 10.1007/s11085-020-09981-8
Junhee Hahn , Shi Yuke , Seong Woong Kim , Seung Eon Kim , Xiao Xiao , Jae Kwon Kim , Dong Bok Lee

Ti-46Al-6Nb-0.5 W-0.5Cr-0.3Si-0.1C alloy was corroded at 900–1100 °C in Ar/0.2%SO2 gas for 50–300 h to study its corrosion behavior in a corrosive SO2-environment. It displayed superior corrosion resistance at 900–1000 °C for 50–100 h, forming triple-layered oxide scales consisting of an outer rutile-TiO2 layer, an intermediate α-Al2O3 layer, and an inner (rutile-TiO2, α-Al2O3)-mixed layer. Preferential oxidation of Ti and Al delayed harmful sulfidation. Since there was a large amount of Al in the alloy, relatively thick intermediate α-Al2O3 layers formed. Nb, W, and Si additionally suppressed rutile formation. Nb, W, Si, and Cr tended to accumulate in subscale mainly due to their thermodynamic nobility compared to Ti and Al. When corroded at 1000 °C for 300 h, the alloy suffered nodular corrosion, forming coarse, discrete oxide nodules consisting of TiO2 and Al2O3. When corroded at 1100 °C for 100 h, the alloy became nonprotective owing to the formation of a thick, loosely adherent scale consisting of outer (TiO2, Al2O3)-oxides and inner (Nb1-xS, TiS)-sulfides, beneath which (TixW1-x, Al3Nb)-mixed subscale existed. Corrosion was generally governed by outward diffusion of Ti, Al, Cr, and W and inward diffusion of oxygen and sulfur. The outward diffusing tendency of Nb and Si was weak. As corrosion temperature and time increased, sulfur diffused more across the oxide scale, eventually resulting in formation of Nb1-xS and TiS sulfides.

中文翻译:

Ti-46Al-6Nb-0.5 W-0.5Cr-0.3Si-0.1C合金在Ar/0.2%SO2气体中的高温腐蚀

Ti-46Al-6Nb-0.5 W-0.5Cr-0.3Si-0.1C 合金在 900-1100 °C 的 Ar/0.2%SO2 气体中腐蚀 50-300 小时,以研究其在 SO2 腐蚀性环境中的腐蚀行为。它在 900-1000 °C 下 50-100 小时表现出优异的耐腐蚀性能,形成三层氧化皮,由外层金红石-TiO2 层、中间 α-Al2O3 层和内层(金红石-TiO2、α-Al2O3 )-混合层。Ti和Al的优先氧化延迟了有害的硫化。由于合金中含有大量的Al,形成了较厚的中间α-Al2O3层。Nb、W 和 Si 还抑制了金红石的形成。与 Ti 和 Al 相比,Nb、W、Si 和 Cr 倾向于在亚尺度中积累,这主要是由于它们的热力学特性。合金在 1000°C 腐蚀 300 h 后,发生球状腐蚀,形成粗大、由 TiO2 和 Al2O3 组成的离散氧化物结核。当在 1100 °C 下腐蚀 100 小时时,由于形成了厚的、松散粘附的氧化皮,该氧化皮由外层 (TiO2, Al2O3)-氧化物和内层 (Nb1-xS, TiS)-硫化物组成,在其下方(存在 TixW1-x、Al3Nb)-混合子尺度。腐蚀通常由 Ti、Al、Cr 和 W 的向外扩散以及氧和硫的向内扩散控制。Nb和Si向外扩散的趋势较弱。随着腐蚀温度和时间的增加,硫更多地扩散到氧化皮中,最终形成 Nb1-xS 和 TiS 硫化物。在其下方存在 (TixW1-x, Al3Nb)-混合子尺度。腐蚀通常由 Ti、Al、Cr 和 W 的向外扩散以及氧和硫的向内扩散控制。Nb和Si向外扩散的趋势较弱。随着腐蚀温度和时间的增加,硫更多地扩散到氧化皮中,最终形成 Nb1-xS 和 TiS 硫化物。在其下方存在 (TixW1-x, Al3Nb)-混合子尺度。腐蚀通常由 Ti、Al、Cr 和 W 的向外扩散以及氧和硫的向内扩散控制。Nb和Si向外扩散的趋势较弱。随着腐蚀温度和时间的增加,硫更多地扩散到氧化皮中,最终形成 Nb1-xS 和 TiS 硫化物。
更新日期:2020-07-01
down
wechat
bug