A novel kind of waterborne epoxy coating pigmented by nano-sized aluminium powders on high strength steel was formulated. Several coatings with different pigment volume content (PVC) were prepared. The coating morphol...A novel kind of waterborne epoxy coating pigmented by nano-sized aluminium powders on high strength steel was formulated. Several coatings with different pigment volume content (PVC) were prepared. The coating morphology was observed using scanning electron microscopy (SEM), and the electrochemical properties were investigated by electrochemical impedance spectroscopy (EIS). Immersion test and neutral salt spray test were also conducted to investigate the corrosion resistance of the coating. It is demonstrated that the critical pigment volume content (CPVC) value is between 30% and 40%. The coating with PVC of 30% exhibits good corrosion resistance in 3.5% (mass fraction) NaCl solution.展开更多
For its poor film forming and water-resistance properties,waterbome epoxy system is not applied for the protection of steel.The main reason for these problems is that the emulsifier of the emulsifying efficiency is no...For its poor film forming and water-resistance properties,waterbome epoxy system is not applied for the protection of steel.The main reason for these problems is that the emulsifier of the emulsifying efficiency is not high while can not be separated out easily.Now,in terms of the use of newly synthesized emulsifiers to improve these two shortcomings,a new system was developed.Compared with solvent-based coatings,this new waterbome epoxy system's corrosion resistance was found close to the solvent-based ones.Finally,the applcation of this new waterbome epoxy system for the protection of steel isdiscussed briefly.展开更多
基金Project(51001007) supported by the National Natural Science Foundation of ChinaProject(2011ZE51057) supported by the Aero Science Foundation of China
文摘A novel kind of waterborne epoxy coating pigmented by nano-sized aluminium powders on high strength steel was formulated. Several coatings with different pigment volume content (PVC) were prepared. The coating morphology was observed using scanning electron microscopy (SEM), and the electrochemical properties were investigated by electrochemical impedance spectroscopy (EIS). Immersion test and neutral salt spray test were also conducted to investigate the corrosion resistance of the coating. It is demonstrated that the critical pigment volume content (CPVC) value is between 30% and 40%. The coating with PVC of 30% exhibits good corrosion resistance in 3.5% (mass fraction) NaCl solution.
文摘For its poor film forming and water-resistance properties,waterbome epoxy system is not applied for the protection of steel.The main reason for these problems is that the emulsifier of the emulsifying efficiency is not high while can not be separated out easily.Now,in terms of the use of newly synthesized emulsifiers to improve these two shortcomings,a new system was developed.Compared with solvent-based coatings,this new waterbome epoxy system's corrosion resistance was found close to the solvent-based ones.Finally,the applcation of this new waterbome epoxy system for the protection of steel isdiscussed briefly.
