Fe2O3/α-Al2O3 pearlescent pigments were prepared by liquid phase deposition method using flake α-Al2O3 as matrix and FeCl3 as iron source.The properties of the prepared pearlescent pigments were characterized by means of SEM,EDS and XRD.The effects of reaction pH value,reaction temperature,iron salt concentration and additive dosage on the coating rate of flaky α-Al2O3 were investigated.The optimum preparation process parameters for the preparation of iron-coated flaky α-Al2O3 were obtained.At the same time,the primary and secondary order of the factors affecting the coating rate was understood.On this basis,the mechanism of the effect of sodium hexametaphosphate on the coating rate was discussed.The results showed that,the order from strong to weak of the factors affecting the coating rate was as follows:reaction pH,reaction temperature,additive dosage,iron salt concentration.The coating rate of Fe2O3/α-Al2O3 prepared under the optimized process parameters was 20.93%.The surface morphology of the sample was smooth and complete.
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