Xie Haiting*,Luo Xiang,Jia Lijun.Preparation of Zn-Ni/PTFE composite coatings and their corrosion resistance and scale inhibition performance in simulated wastewater[J].Plating & Finishing,2023,(9):15-22.[doi:10.3969/j.issn.1001-3849.2023.09.003]
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
- Title:
- Preparation of Zn-Ni/PTFE composite coatings and their corrosion 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
- Keywords:
- Zn-Ni/PTFE composite coating ; simulated wastewater ; concentration of PTFE particles in plating solution ; corrosion resistance ; scale inhibition performance
- 分类号:
- TQ153
- 文献标志码:
- A
- 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 1.24 μ A/cm 2 和最高的极化电阻 14.70 k Ω ·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。
- Abstract:
- ： 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/PTFE 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 1.24 μ A/cm 2 and the highest polarization resistance of 14.70 k Ω ·cm 2 ， the surface scale deposition amount is only 0.15 mg/cm 2 ， and the scale inhibition rate reaches 76.2% ， showing good corrosion resistance and scale inhibition performance in simulated wastewater.
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备注/Memo
收稿日期： 2023-04-17 修回日期： 2023-06-16 * 通信作者： 谢海婷（ 1992 —），硕士，讲师，研究方向：材料腐蚀与污损防护、环境工程技术等， email ： Xie_education00@126.com 基金项目： 国家重点研发计划项目（ 2016YFC0402500 ）