钛合金表面多孔TiO2制备及涂层结合强度改进

为了提高钛合金基体与Fe(吸波剂)/环氧涂层的结合强度,采用微弧氧化在钛合金表面制备一定厚度的二氧化钛多孔膜,之后浸涂Fe/环氧树脂涂料。分别研究了微弧氧化中电流、时间等实验参数对钛合金表面形貌和涂层结合强度的影响,并对所制备的氧化多孔膜在拉伸前后进行扫描电子显微镜(SEM)分析。结果表明:多孔TiO2膜的孔径随电流增大而减小,孔密度随电流增大而增大,随时间增加孔径增大,但时间不宜太长,涂层的结合强度随电流以及时间的增大都是先增大后减小,在3 A,4 min时达到最佳值33.62 MPa。

Preparation of Porous TiO2 on Titanium Alloy Substrate and Improvement of Bonding Strength of Coating

To improve the bonding strength between the titanium alloy substrate and epoxy coating filled with the absorbent Fe,TiO2 films with a certain thickness are prepared on the titanium substrate by constant current micro-arc oxidation.Then it is soaked with the coating composed of epoxy resin filled with Fe.The effects of experimental parameters,such as current,time,etc.on the bonding strength and surface morphologies of titanium alloy are investigated. And TiO2 porous film is observed covered on the titanium alloy surface and then analyzed before and after tensile experiments with the aid of SEM.Results indicate that with the current increasing,TiO2 film possesses smaller diameter pores and lager pore-density.The size of the pores is getting larger with the time prolonging,but too long time is not suitable.The bonding strength of the coating first increases,and then decreases with the increasing of the current and time,and it reaches a maximum value of 33.62 MPa when the current and time is 3 A and 4 min,respectively.