( 東北大學(xué) 教育部材料先進(jìn)制備技術(shù)工程研究中心， 沈陽 110004)
摘 要: 用改進(jìn)的座滴法測量了鋁合金在粉煤灰上的潤濕角。在鋁中添加Mg能減小鋁對粉煤灰的潤濕角，由于Mg能在液滴表面揮發(fā)， 破壞鋁滴表面新產(chǎn)生的氧化鋁，從而改善潤濕性。 粉煤灰中的SiO2、 Fe2O3與鋁發(fā)生反應(yīng)，促進(jìn)鋁合金與基片的潤濕， 但鋁滴表面Mg的揮發(fā)變慢，導(dǎo)致其破壞鋁滴表面氧化鋁的能力逐漸變?nèi)酰?表層氧化鋁的生長速度變快， 同時SiO2、 Fe2O3與鋁反應(yīng)減弱，反應(yīng)性潤濕影響變小， 非反應(yīng)性潤濕在潤濕過程中所起作用變大。
關(guān)鍵字: 潤濕角; 鋁合金; 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
