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<p>Wetting behavior of CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>(–MgO) slag with varying Al<sub>2</sub>O<sub>3</sub> saturation levels on a Pt substrate at 1550&#xa0;°C was investigated using the sessile drop method with applied voltage. Instantaneous changes in contact angle and spreading diameter were observed in real-time by intermittently applying voltages of 0 to ± 0.5&#xa0;V. The results indicated that the wetting behavior was closely related to the polarity and magnitude of the applied voltage, regardless of whether the Al<sub>2</sub>O<sub>3</sub> in the slag was saturated or not. The changes in contact angle and spreading diameter were primarily attributed to changes in the interfacial tension between the slag and the Pt substrate caused by the applied voltage. Within a comparable applied voltage range, compared to the case without applied voltage, a negative voltage increased the interfacial tension between the slag and the Pt substrate, resulting in an increase in the contact angle, while a positive voltage had the opposite effect. For saturated slag, the maximum increment and decrement in interfacial tension were about 34 and 46&#xa0;mN/m, and the maximum increment and decrement in contact angle were about 12.2 and 5.8 deg, respectively; for unsaturated slag, the maximum increment and decrement in interfacial tension were about 8 and 16&#xa0;mN/m, and the maximum increment and decrement in contact angle were about 14.9 and 7.1 deg, respectively. As the applied voltage increased, the extent of change in both the contact angle and the spreading diameter became more pronounced, and there is a negative correlation between them. The change in interfacial tension (the contact angle) between the slag and the Pt substrate was a combined result of the direct influence of the applied voltage and the change in interfacial properties due to electrode reactions.</p>

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Effect of Applied Voltage on Wetting Behavior between CaO–SiO2–Al2O3(–MgO) Slag and Pt Substrate

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Peiwang Liu,
  • Yunming Gao,
  • Qiang Wang,
  • Guangqiang Li

摘要

Wetting behavior of CaO–SiO2–Al2O3(–MgO) slag with varying Al2O3 saturation levels on a Pt substrate at 1550 °C was investigated using the sessile drop method with applied voltage. Instantaneous changes in contact angle and spreading diameter were observed in real-time by intermittently applying voltages of 0 to ± 0.5 V. The results indicated that the wetting behavior was closely related to the polarity and magnitude of the applied voltage, regardless of whether the Al2O3 in the slag was saturated or not. The changes in contact angle and spreading diameter were primarily attributed to changes in the interfacial tension between the slag and the Pt substrate caused by the applied voltage. Within a comparable applied voltage range, compared to the case without applied voltage, a negative voltage increased the interfacial tension between the slag and the Pt substrate, resulting in an increase in the contact angle, while a positive voltage had the opposite effect. For saturated slag, the maximum increment and decrement in interfacial tension were about 34 and 46 mN/m, and the maximum increment and decrement in contact angle were about 12.2 and 5.8 deg, respectively; for unsaturated slag, the maximum increment and decrement in interfacial tension were about 8 and 16 mN/m, and the maximum increment and decrement in contact angle were about 14.9 and 7.1 deg, respectively. As the applied voltage increased, the extent of change in both the contact angle and the spreading diameter became more pronounced, and there is a negative correlation between them. The change in interfacial tension (the contact angle) between the slag and the Pt substrate was a combined result of the direct influence of the applied voltage and the change in interfacial properties due to electrode reactions.