| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 237030 | Powder Technology | 2012 | 8 Pages |
Gold-colored aluminum pigments with double layer structure Al/SiO2/Fe2O3 were prepared successfully through coating Fe2O3 layer on aluminum flake by traditional wet chemical method. The reaction conditions were optimized according to the coating efficiency (CE), percentage of coating (PC) and flop index (FI) values. It was found that at the optimum conditions, the coating efficiency, percentage of coating and flop index values are 95.51%, 31.43% and 13.92 respectively. SEM and AFM were used to characterize the surface morphology of the Al/SiO2/Fe2O3 pigments and the results show that the surface has a heterogeneous nanoparticle layer and the average roughness is 34.8 nm. The optical properties were investigated in detail by using the five angle's spectrophotometer revealing that Al/SiO2/Fe2O3 pigments have angle-dependent optical effects and at least have three different colors from the five angles.
Graphical abstractThis study investigates a kind of gold color aluminum pigments with double layer structure Al/SiO2/Fe2O3 through coating Fe2O3 on aluminum flake by traditional wet chemical method. Results show that the Fe2O3 coated aluminum pigments have angle-dependent optical effects.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Wet chemical method was used for the ferric oxide coating on aluminum pigments. ► The surfactants and pH have great influence on the ferric oxide coating process. ► Gold aluminum pigments with double-layer structure Al/SiO2/Fe2O3 was obtained. ► A layer of smooth and dense ferric oxide layer was formed on Al/SiO2 particle. ► Al/SiO2/Fe2O3 pigments have angle-dependent optical effects.
