基于飞秒激光的钛合金表面微纳米结构制备及腐蚀行为

Micro-nano-structure preparation on surface of titanium alloy based on femtosecond laser and its corrosion behavior

针对海洋深潜服役环境下钛合金的腐蚀失效问题,采用飞秒激光刻蚀技术在钛合金表面制备耐腐蚀的超疏水微纳米结构。探究激光刻蚀参数对表面刻蚀结构的影响机理,以及表面微纳米结构、疏水性能、盐雾腐蚀行为的交互影响规律。结果表明,飞秒激光刻蚀的表面微纳米结构,可以将空气截留于结构之间,并在液体与基底材料之间形成空气保护膜。气膜结构对液体的支撑力提高了钛合金表面的疏水能力,减少了腐蚀性液体与基底金属的接触时间与接触面积,进一步提高钛合金的耐腐蚀性能。

To address corrosion failure of titanium alloys in deep submerged marine service environment,femtosecond laser etching was used to prepare corrosion-resistant super-hydrophobic micro-and nano-structure on surface of titanium alloy.Mechanism of laser etching parameters on the surface etched structure and interaction effect law of surface microstructure,hydrophobic property and salt spray corrosion behavior were investigated.The results showed that surface microstructure etched by femtosecond laser could trap air between microstructures and form an air protective film between liquid and substrate material.The support of air film structure to liquid improved hydrophobic ability of titanium alloy surface,reduced contact time and contact area between corrosive liquid and substrate metal,and further improved corrosion resistance of titanium alloy.