Preparation and Anticorrosive Property of Soluble Aniline Tetramer

Abstract

Soluble aniline tetramer (AT) was successfully prepared by chemical oxidation method. Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible spectroscopy (UV-vis) were used to characterize its structure. The redox behavior of AT was identified through the electrochemical cyclic voltammetry studies. Then, the epoxy coating was prepared by using AT as inhibitor. Its anticorrosive property was evaluated by salt solution resistance test, polarization curve, and electrochemical impedance spectroscopy (EIS). Salt solution resistance test, polarization curves, and EIS measurements indicate that the obtained epoxy anticorrosive coating, containing 1.0% AT, exhibits remarkably enhanced corrosion protection properties on Q235 steel electrodes as compared to pure epoxy anticorrosive coating without AT. The significantly improved anticorrosion performance may be owing to the redox behavior of the AT, adsorption and inhibition effect of AT on Q235 steel surface, as well as synergistic curing effect by AT and polyamide.

Design, synthesis, and evaluation of high‐performing anticorrosive polyurethane coatings with inbuilt redoxable oligomeric aniline segments

“…Results from studies on DCTA, DCTAni, and their EPUU compounds using UV–vis spectroscopy in DMF solvent, both for undoped and doped with 1 M H 3 PO 4 acid, are shown in Figure 2 and the corresponding data available in Table S2. For undoped (EB) oligomers, DCTA and DCTAni both showed three peaks at 280, 340, and 580 nm and two peaks at 320 and 578 nm, respectively 53,54 which are associated with π → π* transitions in the benzenoid ring and charge transfer excitation in the benzenoid to quinoid ring in both. But, when DCTA and DCTAni were doped with 1 M H 3 PO 4 three peaks were obtained at 273, 410, and 740 nm for DCTA, and four peaks at 272, 413, 578, and 756 nm are obtained for DCTAni 55–57 .…”

Application of electroactive Au/aniline tetramer–graphene oxide composites as a highly efficient reusable catalyst

“… 31,32 The other peaks at 1165, 834, and 748 cm −1 are due to C–H bending vibrations. 33 The FTIR spectrum of the ATGO contains the characteristic peaks of AT and GO.…”

Linear and star-shaped π-conjugated oligoanilines: a review on molecular design in syntheses and properties

“…63 Oligoanilines, as nanoparticles, are promising candidates for anticorrosive coating applications. 106,[206][207][208]220,221 Conductive hard segments of oligoanilines in various polymer structures ( product of polycondensation), as a backbone of polyimide, 222 and as a branch of polyurethane 153,223 have shown anticorrosive behavior. The conductivity of oligoanilinebased polyurethane films, doped with para-toluene sulphonic acid, is in the order of 10 −3 to 10 −4 S cm −1 .…”