Corrosion resistance of lamellar aluminium pigments coated by SiO2 by sol–gel method |
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| Authors: | Hui Wang Shu-li Huang Yan-jun Zuo Tao Zhou Lie-rong Zhang |
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| Affiliation: | aCollege of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China;bThe 6th Research Institute of Chemical Defense, Beijing 102205, China |
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| Abstract: | The aluminium pigments were coated with SiO2 by sol–gel method to improve their stability. The effects of formulation factors, such as medium of reaction, adding sequence of catalyst and number of coating, were investigated. The stability of the coated aluminium pigments in acid was examined by measuring the hydrogen generation amount. It was found that the coating layer formation is due to the condensation of tetraethyl orthosilicate (TEOS) to form a dense 3D cross-linked layer on the surface of aluminium. The optimized sequence of adding catalysts would be hydrochloride first, then ammonia. Stability tests confirmed that the aluminium pigments have better corrosion resistance after coating with SiO2. |
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| Keywords: | A. Aluminium pigment B. Erosion C. Paint coatings |
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