Scholarlink

<p>The hot corrosion behavior of Co6Ti11V alloy at 900&#xa0;°C was studied and compared with that of K417 and Co9Al9.5W alloys. The salt coating method was employed, which is a saturated mixture of 75&#xa0;wt.% Na<sub>2</sub>SO<sub>4</sub> + 25&#xa0;wt.% NaCl. The hot corrosion process and the corrosion products were analyzed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and energy-dispersion spectrometry. The results indicate that Co6Ti11V alloy exhibits the hot corrosion resistance similar to Co9Al9.5W alloy, but lower than K417 alloy. Five layers of hot corrosion products were developed, and in order from external to internal, they are (i) CoO, Co<sub>3</sub>O<sub>4</sub>, and TiO<sub>2</sub>, (ii) CoO and CoTiO<sub>3</sub>, (iii) Co<sub>2</sub>VO<sub>4</sub> and minor CoTiO<sub>3</sub>, (iv) MO (M=Ti, V), and (v) Co<sub>9</sub>S<sub>8</sub>, respectively. A dense and continuous MO oxide scale does not form after hot corrosion for 64&#xa0;h,&#xa0;and no stable and dense protective scale is formed, so that the hot corrosion resistance of Co–Ti–V alloy is limited. Extra coating must be introduced for the alloy to provide resistance to hot corrosion and oxidation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Hot corrosion behavior of a Co–Ti–V precipitate-strengthened superalloy at 900 °C

  • 期刊论文

  • 发表日期：

    2026年3月31日

查看全文
  • Peng-Jie Zhou,
  • Ya-Wen Sun,
  • Yan-Xin Qiao,
  • Ying-Jie Wang,
  • En-Ze Liu,
  • Shu-Jin Chen,
  • Katsunari Oikawa,
  • Qi-Chao Zhang,
  • Yi-Sha Jiang

摘要

The hot corrosion behavior of Co6Ti11V alloy at 900 °C was studied and compared with that of K417 and Co9Al9.5W alloys. The salt coating method was employed, which is a saturated mixture of 75 wt.% Na2SO4 + 25 wt.% NaCl. The hot corrosion process and the corrosion products were analyzed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and energy-dispersion spectrometry. The results indicate that Co6Ti11V alloy exhibits the hot corrosion resistance similar to Co9Al9.5W alloy, but lower than K417 alloy. Five layers of hot corrosion products were developed, and in order from external to internal, they are (i) CoO, Co3O4, and TiO2, (ii) CoO and CoTiO3, (iii) Co2VO4 and minor CoTiO3, (iv) MO (M=Ti, V), and (v) Co9S8, respectively. A dense and continuous MO oxide scale does not form after hot corrosion for 64 h, and no stable and dense protective scale is formed, so that the hot corrosion resistance of Co–Ti–V alloy is limited. Extra coating must be introduced for the alloy to provide resistance to hot corrosion and oxidation.