An improved strategy to synthesize graphite oxide with controllable interlayer spacing as coatings for anticorrosion application

Abstract

A facile method to synthesize nanoscale graphene oxide (GO) with controllable interlayer spacing was carried out using two-step oxidation process and much less acid to improve the efficiency of the oxidation. The X-ray diffraction results demonstrated that GO had been successfully prepared from graphite because of disappearance of characteristic peaks of pristine graphite at about 2θ = 26.5 along with appearance of a sharp major peak of GO at about 2θ = 9.4. The increased basal spacing d 001 of as-prepared GO could reach as high as 9.39 Å, suggesting higher degree of oxidation than that prepared by the classical Hummers' synthesis, and characterization results from Fourier transform infrared spectrometer, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy further confirmed this conclusion. The influence of GO on anti-corrosion performance of nanocomposite coatings composited with the 2,5-dimethoxyaniline (DMA) conductive polymer was examined via potentiodynamic polarization curve tests in 3.5 wt% NaCl aqueous solution. The results demonstrated that the incorporation of GO significantly decreased the corrosion current density (i corr = 2.62 μA/cm 2) in the case of GO-PDMA coating, reflecting excellent physical isolation of GO and its synergistic effect with PDMA against the infiltration of water and corrosive electrolyte.

One‐pot construction of polydopamine‐based superhydrophobic coating with enhanced chemical stability and anti‐fouling performance

“…Based on our previous work, 30,31 we used novel trigger nano zero-valent iron and hydrogen peroxide (nZVI/ H 2 O 2 ) for preparing "self-roughened" PDA superhydrophobic coating through a simple one-pot fabrication route. The strategy could be applied to a variety of substrates such as glass slides, polyurethane sheets, PTFE wafers, 304 stainless steel sheets, and polyurethane sponges with high water contact angle of 162.2 and sliding angle lower than 1 .…”