Preparation and characterisation of aluminium pigments coated with silica for corrosion protection |
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Authors: | Yingchao Zhang Hongqi Ye Hui Liu Kai Han |
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Affiliation: | aCollege of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;bState Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China |
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Abstract: | Aluminium pigments with a layer of silica were prepared by a sol–gel method using tetraethoxysilane as precursor and ethylenediamine as catalyst. Under the optimum conditions, the corrosion protection factor can reach 99.3% and average grain almost remains the same size after coating, indicating that the coated aluminium pigments have excellent chemical stability and good dispersibility. FTIR and EDS analyses demonstrate that a layer of silica coating has been formed on the flaky aluminium particle. SEM, AFM and BET analyses show that a smooth and dense silica coating layer has been formed. |
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Keywords: | A Aluminium C Alkaline corrosion B SEM B AFM |
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