A series of plasma-sprayed Al2O3-13wt%TiO2(AT13)coatings were sealed with silicone resin by using impregnating with and without ultrasonic excitation methods,respectively.And,sealing treatments with ultrasonic excitat...A series of plasma-sprayed Al2O3-13wt%TiO2(AT13)coatings were sealed with silicone resin by using impregnating with and without ultrasonic excitation methods,respectively.And,sealing treatments with ultrasonic excitation(UE)were performed at different temperatures.The corrosion behaviors of the sealed AT13 coatings were investigated by immersion corrosion tests.The microstructure and porosity of the coatings were characterized.The porosity of the AT13 coatings decreases after sealing treatments and the coatings sealed with ultrasonic excitation have the lowest porosity.The result of immersion corrosion in 10vol%HCl aqueous solutions shows that most of UE-sealed coatings have lower weight losses value than that of the coatings sealed by conventional impregnating(CI).The ultrasonic excitation was useful for decreasing the opposing force acting against impregnation driven by moisture and air from pores and cracks,and accelerating the fluidity of sealant,which made the sealant penetrate deeply into the inner part of pores and cracks.All the results indicate that the corrosion resistance of plasma-sprayed AT13 coatings can be effectively improved by sealing treatments with ultrasonic excitation.展开更多
An organic-inorganic hybrid sealing agent was fabricated and used in the plasma sprayed Al_(2)O_(3)-13 wt%TiO_(2)coating,and conventional silicone agent was also used for comparison.Protection performance of the coati...An organic-inorganic hybrid sealing agent was fabricated and used in the plasma sprayed Al_(2)O_(3)-13 wt%TiO_(2)coating,and conventional silicone agent was also used for comparison.Protection performance of the coatings was comprehensively evaluated based on both anti-corrosion and anti-biofouling properties.The results reveal that the sealing treatment is remarkably useful to decrease the porosity of the coating,and the porosity of the coating sealed with the hybrid agent is only 0.035%.Immersion corrosion test and Tafel polarization test reveal that the sealed coating with the hybrid agent exhibits a better corrosion resistance by compared with the coating sealed with silicone agent.The corrosion current density i_(corr) of the hybrid agent sealed coating is only 0.7×10^(-6)A·cm^(-2).Moreover,anti-biofouling tests both in the outdoor analogue hydraulic environment and in the natural marine environment prove that the mentioned novel coating presents a better combination of corrosion resistance and anti-biofouling property by compared with the other coatings,and it could be used as a protection of metal components in the marine environment.展开更多
基金Fund of Provincial Education Department,Jiangsu(JHZD09-04)Innovative Research Fund for University Graduate,Jiangsu(2017-B0803334)
文摘A series of plasma-sprayed Al2O3-13wt%TiO2(AT13)coatings were sealed with silicone resin by using impregnating with and without ultrasonic excitation methods,respectively.And,sealing treatments with ultrasonic excitation(UE)were performed at different temperatures.The corrosion behaviors of the sealed AT13 coatings were investigated by immersion corrosion tests.The microstructure and porosity of the coatings were characterized.The porosity of the AT13 coatings decreases after sealing treatments and the coatings sealed with ultrasonic excitation have the lowest porosity.The result of immersion corrosion in 10vol%HCl aqueous solutions shows that most of UE-sealed coatings have lower weight losses value than that of the coatings sealed by conventional impregnating(CI).The ultrasonic excitation was useful for decreasing the opposing force acting against impregnation driven by moisture and air from pores and cracks,and accelerating the fluidity of sealant,which made the sealant penetrate deeply into the inner part of pores and cracks.All the results indicate that the corrosion resistance of plasma-sprayed AT13 coatings can be effectively improved by sealing treatments with ultrasonic excitation.
基金the National Natural Science Foundation of China(No.51379070)the Graduate Research and Innovation Projects of Jiangsu Province(No.KYCX21_0463)。
文摘An organic-inorganic hybrid sealing agent was fabricated and used in the plasma sprayed Al_(2)O_(3)-13 wt%TiO_(2)coating,and conventional silicone agent was also used for comparison.Protection performance of the coatings was comprehensively evaluated based on both anti-corrosion and anti-biofouling properties.The results reveal that the sealing treatment is remarkably useful to decrease the porosity of the coating,and the porosity of the coating sealed with the hybrid agent is only 0.035%.Immersion corrosion test and Tafel polarization test reveal that the sealed coating with the hybrid agent exhibits a better corrosion resistance by compared with the coating sealed with silicone agent.The corrosion current density i_(corr) of the hybrid agent sealed coating is only 0.7×10^(-6)A·cm^(-2).Moreover,anti-biofouling tests both in the outdoor analogue hydraulic environment and in the natural marine environment prove that the mentioned novel coating presents a better combination of corrosion resistance and anti-biofouling property by compared with the other coatings,and it could be used as a protection of metal components in the marine environment.
