纳秒激光制备Fe基非晶合金涂层表面织构的疏水性研究

Study on Hydrophobicity of Surface Texture on Fe-based Amorphous Alloy Coating Treated by Nanosecond Laser

利用冷喷涂技术在35CrMo钢基体上制备了Fe-Cr-Mo-C-B-Y体系非晶涂层,通过纳秒脉冲激光构造了规则排布的乳突、点阵和凹槽结构。结果表明:涂层的表面特征随激光织构的结构及间距的变化而变化。高通量脉冲激光作用下,涂层表面沿激光路径产生更大的凸起物,同时在凸起物上覆盖着由熔融粒子飞溅形成的颗粒物。织构表面同时存在织构、颗粒物、抛光表面三种结构。经过激光加工处理后的涂层表面具有优异的疏水性,与去离子水和钻井液的接触角分别提升至(151.6±0.3)°和(145.9±0.4)°。随着点阵及凹槽织构间距的增加,涂层表面的润湿性从超疏水转向疏水,在间距最大时转变为亲水;乳突织构的间距变化对疏水性影响较小,即使间距增大到300μm时涂层表面依旧能保持疏水性;同时涂层表面表现出疏水稳定性及低粘附性。

Fe-Cr-Mo-C-B-Y amorphous coatings were prepared on 35 CrMo steel by cold spraying(CS)technique.The mastoid-like,dot and groove surface texture structures with regular arrangement were constructed by nanosecond laser.The result show that the surface characteristics of the coating vary with the laser texture structure and spacing.Under the action of high flux pulsed laser,the coating surface produces larger protrusions along the laser path,and the protrusions are covered with particles formed by the splashing structure of molten particles.Texture surface has texture,particle and polished surface at the same time.Besides,the coating surface after laser processing has excellent hydrophobicity,and the contact angle with deionized water and drilling fluid increase to(151.6±0.3)°and(145.9±0.4)°respectively.With the increase of lattice and groove texture spacing,the wettability changes from superhydrophobic to hydrophobic,and becomes hydrophilic when the spacing is maximum.The spacing change of mastoid-like texture has little effect on hydrophobicity,and even if the spacing increases to 300μm,the coating surface can still keep hydrophobic.At the same time,the coating surface showed hydrophobic stability and low adhesion.