( 东北大学 教育部材料先进制备技术工程研究中心， 沈阳 110004)
摘 要: 用改进的座滴法测量了铝合金在粉煤灰上的润湿角。在铝中添加Mg能减小铝对粉煤灰的润湿角，由于Mg能在液滴表面挥发， 破坏铝滴表面新产生的氧化铝，从而改善润湿性。 粉煤灰中的SiO2、 Fe2O3与铝发生反应，促进铝合金与基片的润湿， 但铝滴表面Mg的挥发变慢，导致其破坏铝滴表面氧化铝的能力逐渐变弱， 表层氧化铝的生长速度变快， 同时SiO2、 Fe2O3与铝反应减弱，反应性润湿影响变小， 非反应性润湿在润湿过程中所起作用变大。
关键字: 润湿角; 铝合金; 座滴法; 粉煤灰
（ Key Laboratory of Ministry of Education for Electromagnetic Processing of Materials, Northeastern University, Shenyang 110004, China）
Abstract: The contect angle of the aluminium alloy on fly ash was measured by improved sessile drop technique. Owing to the fact that Mg can volatilize on the liquid droplet surface and destroy the new aluminium oxide on droplet surface, adding Mg in aluminium can reduce the contact angle of aluminium on fly ash and improve the wettability. SiO2 and Fe2O3 contained in fly ash can react with aluminium alloy and promote wetting of aluminium alloy with substrate. However, Mg volatilizing becomes slow on surface and the ability to destroy the aluminum oxide becomes weak gradually, then growth speed of aluminum oxide layer on surface becomes quick with the weakening of reaction of SiO2, Fe2O3 and aluminium, then the reactivity wetting influence is reduced and the non-reactivity wetting affects chiefly on the contact course.
Key words: contact angle; aluminium alloy; sessile drop technique; fly ash
