等离子喷涂Al_2O_3-13%TiO_2涂层的海水腐蚀磨损性能

Tribocorrosion Behavior of Plasma Sprayed Al_2O_3-13%TiO_2 Coatings in Seawater

基于等离子喷涂技术构筑了高耐磨、耐蚀的Al_2O_3-13%TiO_2涂层(AT13涂层),利用Rtec磨蚀试验机研究AT13涂层在干摩擦、去离子水和人工海水介质中的摩擦磨损性能,并利用电化学工作站分析了涂层在静态腐蚀和滑动磨损中的开路电位和极化曲线的变化,探讨了AT13涂层的腐蚀磨损机理。结果表明:热喷涂AT13涂层由α-Al_2O_3、γ-Al_2O_3、金红石型TiO_2和Al_2TiO_5相组成,其中富Ti相呈条带状分布于富Al基体中;AT13涂层在海水工况具有较好的润滑性,与干摩擦相比,其摩擦因数减小了0.15,且具有较好的稳定性;在3种工况下,AT13涂层都具有优异的耐磨损性能,海水润滑条件下,AT13涂层具有最小的磨损率,且随载荷的增加而减小;磨损过程加重了海水对涂层的腐蚀,但影响较小。

Al2 O3- 13 % TiO2 （AT13） coatings with high tribocorrosion resistance were prepared by plasma spraying method. The tribological properties of Al2O3-13%TiO2 coatings under dry sliding, deionized water and artificial seawater conditions were carried out using an Rtec tribometer. The open circuit voltage and polarization curve of the coatings were investigated with electrochemical workstation under static corrosion state and sliding wear condition, and the tribocorro- sion mechanism of AT13 coating was also discussed. The results show that the thermal spraying AT13 coatings consists of α-Al2O3, γ-Al2O3, rutile-TiO2 and Al2 TiO5, and the rich-Ti phases are distributed in the rich-AI phases. AT13 coatings have good lubrication under artificial seawater conditions, and its friction coefficient decreases 0. 15 compared with those under dry sliding and has a good stability. The AT13 coatings have excellent wear resistant under different conditions. AT13 coating has minimal wear rate which decreases with increasing loads under seawater conditions. The wear process enhanced the corrosion behavior of AT13 coatings.