Electrochemical synthesis of polypyrrole/polydopamine for aluminum alloy corrosion inhibition

被引：0

作者：

Nie M. ^{[1
]}

Huang F. ^{[1
]}

Wang Z. ^{[2
]}

Fu R. ^{[2
]}

Ning C. ^{[2
]}

机构：

[1] Electric Power Research Institute, Guangdong Power Grid CO., LTD., Guangzhou

[2] School of Materials Science and Engineering, South China University of Technology, Guangzhou

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2019年 / 36卷 / 10期

关键词：

Aluminum alloy; Anti-corrosion; Coating; Electrochemical polymerization; Polydopamine(PDA); Polypyrrole(PPy);

D O I：

10.13801/j.cnki.fhclxb.20181128.001

中图分类号：

学科分类号：

摘要：

Polypyrrole(PPy)/polydopamine(PDA) coating was prepared on the surface of 7075 aluminum alloy through electrochemical polymerization to improve the corrosion resistance of aluminum alloy organic coatings. FE-SEM, atomic force microscope and FTIR were used to analyze the surface morphology, surface roughness and chemical composition of PPy/PDA coating, respectively. AC impedance spectroscopy was applied to study the impedance characteristics of the coating. The polarization voltage and polarization current of the aluminum alloy coated with PPy/PDA were analyzed by polarization curves to study the corrosion resistance. The research shows that pyrrole and dopamine simultaneously electrochemically polymerize on the aluminum alloy surface by one-step electrochemical polymerization. PPy molecular chains and PDA molecular chains form network interpenetrating structure. PPy/PDA coating has a sea-island structure with a surface roughness of (73.740±7.811) nm, which is close to the roughness of the pure PPy coating (74.582±7.227) nm. The polarization curves indicate that the corrosion current and corrosion voltages of the coated PPy/PDA coating are 4.1825×10-6 A•cm-2 and -0.6919 V, respectively. And the corrosion current and corrosion voltages of the pure PPy are 7.618×10-6 A•cm-2 and -0.7403 V, respectively. © 2019, Editorial Office of Acta Materiae Compositae Sinica. All right reserved.

引用

页码：2364 / 2370

页数：6

共 24 条

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