(中南大學(xué) 化學(xué)化工學(xué)院，長(zhǎng)沙 410083)
摘 要: 采用分步液相沉積法在片狀鋁粉表面包覆SiO2與Fe2O3雙層薄膜制備了具有金屬光澤的彩色鋁粉，以彩度與光澤度為主要評(píng)價(jià)指標(biāo)，探討Fe2O3用量與pH值對(duì)鋁粉包覆效果的影響，利用原子力顯微鏡(AFM)、掃描電子顯微鏡(SEM)和X射線衍射(XRD)等手段對(duì)包覆前后的鋁粉進(jìn)行表征。結(jié)果表明：當(dāng)SiO2包覆量為20%(質(zhì)量分?jǐn)?shù))時(shí)，隨著Fe2O3膜厚的增加，鋁粉顏色由淺黃→金黃→紅黃過(guò)渡，光澤度下降；當(dāng)m(Fe2O3):m(SiO2):m(Al)= 0.75:0.2:1時(shí)，鋁粉具有良好的彩度與光澤度，鋁粉表面粗糙度由5.05 nm增大到20.6 nm；反應(yīng)過(guò)程pH值對(duì)Fe2O3包覆效果有重要影響，pH值宜控制在3.9~4.0；表面活性劑PVP的加入有利于提高Fe2O3膜層與SiO2和Al基體的結(jié)合力，從而提高顏色穩(wěn)定性。
關(guān)鍵字: 片狀鋁粉；表面包覆；氧化鐵；彩度；光澤度
Fe2O3/SiO2/Al by liquid deposition
（School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:The colored aluminum flake powder with metallic luster was prepared by encapsulating SiO2 and Fe2O3 double-layer film via step liquid-phase deposition method. Using the chromaticity and gloss as the main targets, the influence of Fe2O3 amount and pH value on the coating effect was studied. The unencapsulated and encapsulated aluminum powders were characterized by AFM, SEM and XRD. The results show that when the amount of SiO2 is 20% (mass fraction), with the increase of Fe2O3 amount, the aluminum powder changed colors from pale-yellow to golden-yellow, and then to red-yellow, and the gloss is reduced. Under the condition of m(Fe2O3):m(SiO2):m(Al)= 0.75:0.2:1, the encapsulated sample has good chromaticity and gloss synchronously, and the surface roughness of the aluminum powder increases from 5.05 nm to 20.6 nm. Furthermore, pH value should be controlled between 3.9 to 4.0. The addition of PVP is helpful to improve the color stability property of the aluminum powder, the Fe2O3 film is firmly combined with SiO2 and Al.
Key words: flake aluminum powder; surface coating; ferric oxide; chromaticity; gloss
