Zn-Ni/PTFE复合镀层制备及其在模拟污水中的耐腐蚀与阻垢性能  

Preparation of Zn-Ni/PTFE composite coatings and their corrosion resistance and scale inhibition performance in simulated wastewater

作　　者：谢海婷 罗翔 贾丽君 Xie Haiting;Luo Xiang;Jia Lijun(New Academy of Sciences,Zhengzhou University of Science and Technology,Zhengzhou 450064,China;School of Architecture and Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州科技学院新科学院,河南郑州450064 [2]郑州大学建筑与土木工程学院,河南郑州450001

出　　处：《电镀与精饰》2023年第9期15-22,共8页Plating & Finishing

基　　金：国家重点研发计划项目(2016YFC0402500)。

摘　　要：为进一步提高Zn-Ni合金镀层的耐腐蚀性能同时赋予其良好的阻垢性能,通过电沉积方法将改性PTFE颗粒引入Zn-Ni合金镀层中,并研究镀液中PTFE颗粒浓度对复合镀层的表面形貌、化学成分以及在模拟污水中的耐腐蚀与阻垢性能的影响。结果表明:改变镀液中PTFE颗粒浓度获得的不同Zn-Ni/PTFE复合镀层晶粒形状相似且尺寸接近,PTFE颗粒附着在晶粒表面并填充晶粒间空隙,对复合镀层的化学成分以及在模拟污水中的耐腐蚀与阻垢性能有一定影响。当镀液中PTFE颗粒浓度为12 g/L时,获得的Zn-Ni/PTFE复合镀层中PTFE颗粒的分散性较好,起到屏蔽作用,有效地阻挡腐蚀介质渗透,同时降低复合镀层表面能,阻碍污垢黏附与沉积。该复合镀层具有最正的腐蚀电位-509 mV、最低的腐蚀电流密度1.24μA/cm^(2)和最高的极化电阻14.70 kΩ·cm^(2),表面污垢沉积量仅为0.15 mg/cm^(2),阻垢率达到76.2%,在模拟污水中表现出良好的耐腐蚀与阻垢性能。The modified PTFE particles were introduced into the Zn-Ni alloy coating by electrodeposition method in order to improve the corrosion resistance and endow Zn-Ni alloy coating with good scale inhibition performance,and the influence of concentration of PTFE particles in plating solution on the surface morphology,chemical composition,corrosion resistance and scale inhibition performance of the composite coating in simulated wastewater were further studied.The results show that different Zn-Ni/PTFE composite coatings obtained by changing the concentration of PTFE particles in plating solution have similar grain shape and size,and PTFE particles attach to the surface of the grains and fill the gaps between the grains,which has an effect on the chemical composition and corrosion resistance and scale inhibition performance of the composite coatings in simulated wastewater.When the concentration of PTFE particles in plating solution is 12 g/L,PTFE particles are uniformly dispersed in the Zn-Ni/PT‐FE composite coating,which effectively blocks the penetration of corrosive medium and reduces the surface energy of the composite coating to prevent fouling adhesion and deposition.The Zn-Ni/PTFE composite coating has the most positive corrosion potential of-509 mV,the lowest corrosion current density of 1.24μA/cm^(2) and the highest polarization resistance of 14.70 kΩ·cm^(2),the surface scale deposition amount is only 0.15 mg/cm^(2),and the scale inhibition rate reaches 76.2%,showing good corro‐sion resistance and scale inhibition performance in simulated wastewater.

关 键 词：Zn-Ni/PTFE复合镀层 模拟污水 镀液中PTFE颗粒浓度 耐腐蚀性能 阻垢性能 

分 类 号：TQ153[化学工程—电化学工业]