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Characterization and Electrochemical Investigations of Polypyrrole/Aluminum Flake Composite Pigments on AA 2024-T3 Substrate

机译:AA 2024-T3基底上的聚吡咯/铝片状复合颜料的表征和电化学研究

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Phosphate and nitrate doped Polypyrrole (PPy)/Aluminum (Al) flake pigments were synthesized by chemical oxidative polymerization method. Coatings were formulated from the phosphate doped PPy/Al flake pigment, nitrate doped PPy/Al flake, and as received Al flakes at 20% pigment volume concentration (PVC). The anticorrosion properties of coatings on aluminum alloy (AA 2024-T3) were monitored by exposure with accelerated salt spray (ASTM B117), electrochemical impedance spectroscopy (EIS), scanning vibrating electrode technique (SVET), and anodic polarization experiments. Phosphate and nitrate doped PPy/Al flake coatings showed enhanced anticorrosion ability in comparison with as received Al flake coating as observed in accelerated salt spray test. In the anodic polarization experiments, phosphate and nitrate doped PPy/Al flake coatings exhibited a positive shift in the potential suggesting the passivation of the substrate. Additionally, SVET experiments did not detect appreciable corrosion activity for the samples demonstrating better corrosion protection ability of phosphate and nitrate doped PPy/Al flake coatings.
机译:通过化学氧化聚合法合成了磷酸盐和硝酸盐掺杂的聚吡咯(PPy)/铝(Al)片状颜料。由磷酸盐掺杂的PPy / Al片状颜料,硝酸盐掺杂的PPy / Al片状以及接收到的Al鳞片(颜料体积浓度为20%)配制涂料。通过用加速盐雾(ASTM B117)暴露,电化学阻抗谱(EIS),扫描振动电极技术(SVET)和阳极极化实验对铝合金(AA 2024-T3)上的涂层的防腐性能进行监控。磷酸盐和硝酸盐掺杂的PPy / Al鳞片涂层与加速盐雾试验中观察到的铝鳞片涂层相比,显示出更高的防腐能力。在阳极极化实验中,磷酸盐和硝酸盐掺杂的PPy / Al鳞片涂层在电位上显示出正向偏移,表明基材已钝化。此外,SVET实验未发现样品具有明显的腐蚀活性,表明磷酸盐和硝酸盐掺杂的PPy / Al薄片涂料具有更好的腐蚀防护能力。

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