Shear flow-assisted electrodeposition of nickel coating with directional multilayer graphene distribution

Since multilayer graphene is anisotropic, the orientation distribution of MLG within the coating is critical for enhancing wear and corrosion resistance. To mitigate the issue of random angular distribution of MLG, during electrodeposition, shear flow was applied. The prepared Ni-MLG composite coatings exhibited distinct MLG orientations under this condition. With increasing shear flow intensity, the MLG arrangement transitioned from disordered to ordered, and subsequently back to disordered. SEM images revealed that at the optimized shear flow intensity ( τ=4.16Pa" role="presentation"> τ = 4.16 Pa ), MLG exhibited nearly horizontal alignment. Shear flow promoted MLG migration, thereby enhancing MLG deposition into the coating. As a consequence of dispersion strengthening and grain refinement strengthening, the microhardness increased to 671.2 HV. Coatings fabricated under different τ" role="presentation"> τ displayed various wear characteristics during tribological tests. At τ=4.16Pa" role="presentation"> τ = 4.16 Pa , the composite coating manifested a combination of adhesive wear and abrasive wear characteristics. The coefficient of friction decreased to 0.16±0.010" role="presentation"> 0.16 ± 0.010 , and the wear rate was significantly by 79.3%to2.574±0.23×10⁻⁶mm³/N·m" role="presentation"> ⁻ ⁶ 79.3 % to 2.574 ± 0.23 × 10 ⁻ ⁶ mm ³ / N · m . Concurrently, the corrosion current density reduced to 4.608±0.16μA/cm²" role="presentation"> 4.608 ± 0.16 μA / cm ² , attributed to the superior barrier effect provided by the small-angle-distributed MLG. Furthermore, after low surface energy modification, the micro-convex structure of the coating surface successfully formed a superhydrophobic surface, demonstrating a contact angle of 155°±1.45°" role="presentation"> 155 ° ± 1.45 ° . This superhydrophobicity was maintained even after abrasion with 300 cm distance sandpaper (SiC, 800 grit, 4.5 kPa pressure), confirming excellent mechanical robustness. This technique provides a novel approach for developing protective metallic coatings.

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成果名称:低表面能涂层

合作方式:技术开发

联 系 人:周老师

联系电话:13321314106

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成果名称:低表面能涂层

合作方式:技术开发

联 系 人:周老师

联系电话:13321314106

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成果名称:低表面能涂层

合作方式:技术开发

联 系 人:周老师

联系电话:13321314106

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成果名称:低表面能涂层

合作方式:技术开发

联 系 人:周老师

联系电话:13321314106

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