Ni-P-PTFE复合镀层对颗粒污垢沉积特性影响研究

为探究Ni-P-PTFE复合镀层对颗粒污垢沉积特性的影响，利用化学镀工艺在碳钢表面制备Ni-P-PTFE复合镀层，以TiO₂纳米颗粒为研究对象，通过实验和理论分析的方式研究了不同表面能（PTFE浓度）下Ni-P-PTFE复合镀层在TiO₂悬浮液中的颗粒污垢沉积特性。结果表明：相比于碳钢试样，Ni-P-PTFE复合镀层对于TiO₂颗粒沉积具有较好的抑制效果。随着PTFE浓度的增加，复合镀层的表面能降低，污垢沉积量呈下降趋势，在表面能为26.8 mJ/m²（PTFE=12 ml/L）时，TiO₂颗粒污垢在Ni-P-PTFE复合镀层的沉积量最小。实验结果与应用扩展的DLVO理论计算出的最佳表面能结果相一致，也为针对不同类型颗粒在换热表面的沉积的抑垢提供了指导施镀的依据。

Study on the effect of Ni-P-PTFE composite coating on the deposition characteristics of particulate fouling

To explore the effect of Ni-P-PTFE composite coating on particle fouling characteristics, the Ni-P-PTFE composite coating was prepared on the surface of carbon steel by electroless plating process. Taking TiO₂ nanoparticles as the research object, the particle fouling deposition characteristics of Ni-P-PTFE composite coatings in TiO₂ suspensions under different surface energies (PTFE concentrations) were studied through experiments and theoretical analysis. The results show that the Ni-P-PTFE composite coating has better inhibition effect on TiO₂ particulate deposition compared with carbon steel. With the increase of PTFE concentration, the surface energy of the composite coating decreases and the fouling deposition tends to decrease. The deposition of TiO₂ particulate fouling in the Ni-P-PTFE composite coating is the smallest at the surface energy of 26.8 mJ/m² (PTFE=12 ml/L). The experimental results are consistent with the optimal surface energy results calculated by the extended DLVO theory, and also provide a guiding basis for the anti-fouling of different types of particles deposited on heat exchange surfaces.