TC4钛合金表面类金刚石薄膜在模拟人体体液环境中的腐蚀行为研究

Corrosion Behavior of Diamond-like Carbon Film on the Surface of TC4 Titanium Alloy in Simulated Human Body Fluid Environment

利用等离子体增强化学气相沉积技术,在不同粗糙度的TC4钛合金表面制备类金刚石(DLC)薄膜,探究其在人体体液环境过程中的腐蚀行为及相关机理。结果表明:不同粗糙度TC4钛合金表面制备DLC薄膜的耐蚀性能有显著差异。粗糙度过低时,DLC膜致密度较低,膜基结合力下降,在浸泡过程中薄膜已发生腐蚀而破损。过高的粗糙度会导致DLC薄膜发生点蚀而降低其使用寿命。粗糙度为800目的TC4钛合金表面制备的DLC薄膜浸泡在模拟人体体液中具有更好的稳定性和耐腐蚀能力。

Diamond-like carbon(DLC)films were prepared on the surface of TC4 titanium alloys with different roughnesses using plasmaenhanced chemical vapor deposition technology.The corrosion behaviors and related mechanisms in the process of human body fluid environment were investigated.The results show that the corrosion resistances of DLC films prepared on the surface of TC4 titanium alloys with different roughnesses were significantly different.When the roughness was too low,the density of the DLC film was low.The bonding force of the film between DLC and the matrix was decreased,and the film had been corroded and damaged during the immersion process.High roughness can cause pitting corrosion of the DLC film and can reduce its service life.The DLC film prepared on the surface of the TC4 titanium alloy with a roughness of 800 mesh has better stability and corrosion resistance when immersed in a simulated human body fluid.