Study on Hydrophobicity of Surface Texture on Fe-based Amorphous Alloy Coating Treated by Nanosecond Laser
XU Junjie1,2, KANG Jiajie1,3,4, YUE Wen1,3, ZHOU Yongkuan1, ZHU Lina1,3, FU Zhiqiang1,3, SHE Dingshun1,3
1 School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China 2 Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China 3 Zhengzhou Institute, China University of Geosciences (Beijing), Zhengzhou 451283, China 4 Institute of Flexible Electronics Technology of Tsinghua, Jiaxing 314000, Zhejiang, China
Abstract: Fe-Cr-Mo-C-B-Y amorphous coatings were prepared on 35CrMo 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 300 μm, the coating surface can still keep hydrophobic. At the same time, the coating surface showed hydrophobic stability and low adhesion.
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2022, Vol. 36 
