Corrosion protection of aluminum by electrochemically synthesized composite organic coating

The corrosion performance of TiO2 doped polypyrrole coated (PPy-TiO2) aluminum and application as anode material for direct methanol fuel cell were investigated. The surface morphology was analyzed by scanning electron microscopy, atomic force microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction technique. The conductivity values of coatings were measured with four probe technique. The electrochemical impedance spectroscopy and anodic polarization obtained at periodic intervals for 168h. The corrosion resistance of Al/PPy-TiO2 is almost 5 times higher than Al for 168h immersion. PPy-TiO2 coating has better electrocatalytic activity than PPy for methanol oxidation reaction. © 2015 Elsevier Ltd

The electrochemical synthesis and corrosion behaviour of TiO2/poly(indole-co-aniline) multilayer coating: Experimental and theoretical approach

The aim of this study was to protect stainless steel against corrosion via poly (indole-co-aniline) with the help of titanium dioxide pre-coating. Different monomer ratios (1:1 and 1:9) were applied in order to determine the suitable chain composition to synthesize the copolymer in lithium perchlorate containing acetonitrile. The structures, morphologies, electrochemical properties and corrosion resistances of the mono and multi-layer coatings were investigated by Fourier-transform infrared spectra, scanning electron microscope, energy dispersive X-ray spectrometer, electrochemical impedance spectroscopy and anodic polarization. Furthermore the geometric structure and electronic properties of indole, aniline, and indole-co-aniline (dimmer) molecules have been investigated by quantum calculations. The results indicated that corrosion protection of copolymers was increased via titanium dioxide pre-coating. The 1:1 copolymer coating showed better corrosion prevention than 1:9 coating. The correlation was determined between experimental and theoretical parameters. © 2017 The AuthorsThis study has been financially supported by the Çukurova University research fund. The authors are greatly thankful to Çukurova University Research fund (Project Number: FEF2010D20)