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| Effect of Ti on silicate passivation film on zinc coating |
| 1.Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; 2.Yunnan Dianke Coating Material Co., Ltd., Kunming, Yunnan 650093, China |
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Abstract Based on silicate passivation technology, the effects of Ti ion on morphology, chemical composition and corrosion resistance of the coating were investigated by SEM，XPS，EIS and NSS. The results show that Ti ion can control the deposition rate and refine particles to make the film flat, dense, crack-free and make the particle agglomerates smaller.TiO2 particles may be filled in film layer to increase the coating density simultaneously and improve the corrosion resistance of the film significantly. Passivation process is complex heterogeneous reaction. The main compositions of the film are Zn4Si2O7-(OH)2?2H2O, SiO2, ZnO, Zn(OH)2 and TiO2.
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Received: 25 August 2014
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2015, Vol. 36 
