Influence of Sealing Treatments with Ultrasonic Excitation on Corrosion Resistance of Plasma-sprayed Al203-13wt％Ti02 Coatings
A series of plasma-sprayed Al2O3-13wt％TiO2 (AT 13) 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 AT 13 coatings were investigated by immersion corrosion tests. The mi-crostructure and porosity of the coatings were characterized. The porosity of the AT 13 coatings decreases after sealing treatments and the coatings sealed with ultrasonic excitation have the lowest porosity. The result of immersion corrosion in 10vol％ HC1 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 AT 13 coatings can be effectively improved by sealing treatments with ultrasonic excitation.
plasma spraying sealing treatments corrosion resistance
Si Liqiong Wang Zehua Zhou Zehua Jiang Shaoqun Cheng Jiangbo Wang Gang
Hohai University, Nanjing, 210098, China
国际会议
西安
英文
223-227
2011-05-11（万方平台首次上网日期，不代表论文的发表时间）