期刊
ELECTROCHIMICA ACTA
卷 54, 期 17, 页码 4245-4252出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.02.077
关键词
Polyaniline; Aluminium; Filiform corrosion; Inhibition; Coating
资金
- UK Engineering and Physical Sciences Council (EPRSC)
- EPSRC [EP/D05284X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D05284X/1] Funding Source: researchfish
Dispersions of the polyaniline emeraldine salt (ES) of paratoluene sulphonic acid (PAni-pTS) effectively inhibit filiform corrosion (FFC) affecting polyvinyl butyral (PVB) coated AA2024-T3 aluminium alloy. An in-situ scanning Kelvin probe (SKP) technique is used to study the effect of systematically varying PAni-pTS volume fraction (phi(pa)) on FFC initiation and propagation. For phi(pa) < 0.15, there is no evidence of FFC inhibition and E-corr values recorded for the intact coated aluminium (E-intact) remain similar to those measured for unpigmented PVB. At phi(pa) >= 0.15. a marked rise in E-intact is observed, FFC propagation rates decrease and significant oxide growth is observed at the coating-metal interface. For emeraldine base (PAni-EB)-containing coatings, there is no evidence of interfacial oxide film formation, no ennoblement of E-intact and minimal inhibition of FFC. Conversely, when a PAni-pTS induced oxide covered surface is re-coated using unpigmented PVB and FFC is initiated as per normal, a substantial reduction in the rate of FFC propagation is observed. It is therefore proposed that inhibition of FFC by PAni-pTS arises principally as a result of the protective nature of the oxide film formed at the metal-coating interface. (C) 2009 Elsevier Ltd. All rights reserved.
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