Anti-scale and anti-corrosion properties of PDA/PTFE superhydrophobic coating on metal surface

doi:10.16085/j.issn.1000-6613.2022-1765

Abstract

Abstract:

Superhydrophobic coatings have very wide applications, but the fabrication of stable superhydrophobic coatings on metal surface has the challenge. In order to improve the stability of the coating, a stable polydopamine (PDA) intermediate coating was fabricated on the stainless-steel surface by simple immersion method, and then the polytetrafluoroethylene (PTFE) superhydrophobic coating was prepared on the surface modified by PDA by the electrophoretic deposition method. The field emission scanning electron microscope, contact angle tester and electrochemical workstation were adopted to analyze the performance of the PDA/PTFE coating. The surface of the prepared PDA/PTFE coating presented a bump structure. With the increase of electrodeposition preparation time and water content in solution, the water contact angle of the coating surface increased first and then decreased. The maximum water contact angle was 160.2°±1.3° and the surface energy of coating was 5.57mN/m. The test of tape stripping and sandpaper wear showed that the prepared PDA/PTFE coating was very stable. The fouling deposition test indicated that the scale inhibiting rate of the coating surface was 64.71%, 72.22% and 81.25% in comparison with the untreated stainless steel after immersion in supersaturated CaCO₃ solution at 50℃, 70℃ and 90℃ for 12 hours, respectively. Electrochemical test results showed that PDA/PTFE superhydrophobic coating had better corrosion resistance with the corrosion inhibition rate of 95.1% compared with the pure stainless steel.

Key words: PDA/PTFE superhydrophobic coating, electrodeposition, stability, anti-scale, anti-corrosion

摘要：

超疏水涂层具有极广的应用前景，然而在金属表面制备稳定的超疏水涂层具有一定挑战。为提高涂层稳定性，本文通过简单浸泡法在不锈钢表面形成稳定的聚多巴胺（PDA）中间涂层，随后采用电泳沉积法在PDA修饰后的表面制备聚四氟乙烯（PTFE）超疏水涂层。测试中采用场发射扫描电镜、接触角测试仪及电化学测试仪进行PDA/PTFE涂层分析和表征。制备的PDA/PTFE涂层表面呈现凸起结构，提高电沉积制备时间与溶液中水含量，涂层表面水接触角呈现先增加后降低的变化趋势，制备涂层中最大水接触角为160.2°±1.3°，相应涂层的表面能为5.57mN/m。胶带剥离与砂纸磨损试验表明，PDA/PTFE涂层具有较好的稳定性。污垢沉积试验表明，浸泡在50℃、70℃与90℃碳酸钙过饱和溶液12h后，与不锈钢相比，涂层抑垢率分别为64.71%、72.22%与81.25%。电化学测试表明，PDA/PTFE超疏水涂层具有较好的耐腐蚀性能，与不锈钢相比，涂层缓蚀率为95.1 %。

关键词: PDA/PTFE超疏水涂层, 电沉积, 稳定性, 抑垢, 耐腐蚀

CLC Number:

TG17

WANG Xin, WANG Bingbing, YANG Wei, XU Zhiming. Anti-scale and anti-corrosion properties of PDA/PTFE superhydrophobic coating on metal surface[J]. Chemical Industry and Engineering Progress, 2023, 42(8): 4315-4321.

王鑫, 王兵兵, 杨威, 徐志明. 金属表面PDA/PTFE超疏水涂层抑垢与耐腐蚀性能[J]. 化工进展, 2023, 42(8): 4315-4321.

Figures/Tables 10

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样品	腐蚀电位/V	腐蚀电流密度/μA·cm^-2
不锈钢	-0.23	0.82
PDA/PTFE	-0.15	0.04

样品	腐蚀电位/V	腐蚀电流密度/μA·cm^-2
不锈钢	-0.23	0.82
PDA/PTFE	-0.15	0.04

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