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Anti-corrosion performance of waterborne Zn-rich coating with modified silicon-based vehicle and lamellar Zn (Al) pigments
Authors:Liuyan Zhang  Aibin M  Jinghua Jiang  Dan Song  Jianqing Chen and Donghui Yang
Institution:National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing 210098, PR China College of Mechanics and Materials, Hohai University, Nanjing 210098, PR China;Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing 210098, PR China College of Mechanics and Materials, Hohai University, Nanjing 210098, PR China;College of Mechanics and Materials, Hohai University, Nanjing 210098, PR China Changzhou Hohai Technology Research Institute Co., Ltd, Changzhou, PR China;College of Mechanics and Materials, Hohai University, Nanjing 210098, PR China Changzhou Hohai Technology Research Institute Co., Ltd, Changzhou, PR China;College of Mechanics and Materials, Hohai University, Nanjing 210098, PR China cChangzhou;College of Mechanics and Materials, Hohai University, Nanjing 210098, PR China cChangzhou
Abstract:In order to develop the eco-friendly Zn-rich coatings with higher corrosion resistance and lower pigment contents, several series of coatings were designed and manufactured employing lamellar Zn (Al) pigments mixed with silicone-acrylate emulsion modified inorganic silicate vehicle, and then were evaluated by conventional methods and the electrochemical method. The results indicated that the pigment contents reduced to approximate 25 mass% with lamellar Zn or (Zn and Al) pigments as substitute for spherical Zn pigments, and pigment mixtures were homogeneously dispersed due to silicone-acrylate emulsion moistening modification. Furthermore, the optimal coating had good coating properties (adhesion grade: one), acid resistance (lower mass losses) and anti-corrosive performance (improved corrosion potential and anodic passivation). The experimental results indicated that the modified lamellar Zn (Al) coating was suitable for large-scale spread and application on protecting steel structures in the hostile environment.
Keywords:Zn-rich coating  Corrosion performance
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