Ni-P-PTFE镀层表面黏液形成菌的污垢特性

目的 研究Ni-P-PTFE镀层改性换热面对微生物污垢的抑制作用.方法 调整化学镀工艺,在换热器常用的低碳钢表面制备不同性能的复合镀层,获取镀层厚度、镀速和表面能等参数.对低碳钢和Ni-P-PTFE复合镀层进行微观形貌对比,并进行黏液形成菌污垢静置实验,测量菌悬液中的细菌数量变化及试样质量变化.分析复合镀层表面在黏液形成菌污垢实验前后的宏观和微观形貌,与低碳钢试样进行对比,研究复合镀层试样表面能和镀层表面污垢沉积的关联性.结果 Ni-P-PTFE复合镀层改变了换热面的表面性能,接触角明显增大,表面能由改性前的49.16 mJ/m2降低到7.54 mJ/m2.与低碳钢的静置结果 相比,悬挂复合镀层试样的菌悬液中黏液形成菌数量显著减少,复合镀层试样表面平均污垢沉积量减少到2.3 g/m2(低碳钢表面为12.1 g/m2).结论 Ni-P-PTFE镀层可以有效抑制黏液形成菌的生长,低表面能有效减少了微生物污垢的沉积,使其表现出良好的耐蚀性和抗垢性.

Microbial Fouling Characteristics of Slime-forming Bacteria on Composite Coating of Ni-P-PTFE

Objective In order to investigate the influence of the modified surface on microbial fouling, the microbial fouling experiment of slime-forming bacteria on the composite coating of Ni-P-PTFE was conducted in this study. Methods Several composite coatings with different properties were prepared by electroless plating on the surface of carbon steel and the parameters such as plating thickness, plating speed and surface energy were obtained. The microstructure of electroless composite plating of Ni-P-PTFE and low carbon was compared by scanning electron microscopy, and the slime-forming bacteria microbial fouling experiments of low carbon steel and the composite coatings samples were conducted. The variation of bacteria amount in the bacterial suspension and weight variation of the samples were documented; The macroscopic and microscopic morphologies of the composite coatings were obtained and analyzed before and after the slime-forming bacteria fouling experiment, with low carbon steel as a control, the relationship between surface energy of the composite coatings and fouling deposit on the coatings was discussed. Results The surface properties of heat exchanger were changed by Ni-P-PTFE coating, as the contact angle increased significantly, and the surface energy of the samples decreased from 49. 16 mJ / m2(carbon steel) to 7. 54 mJ / m2( composite coating steel). The number of slimeforming bacteria in the suspension containing the composite coatings reduced markedly, and the average volume of dirt deposited on the coatings reduced from 12. 1 g / m2(carbon steel) to 2. 3 g / m2(composite coating steel). Conclusion It is reasonable to believe that the Ni-P-PTFE coating on low carbon steel could effectively inhibit the growth of mucus-forming bacteria, and the lower surface energy brought by the coating could reduce the deposition of microbial fouling. The composite coating showed excellent corrosion resistance and anti-fouling performance.