Preparation of One-Dimensional Polyaniline Nanotubes as Anticorrosion Coatings

Abstract

Uniform polyaniline (PANI) nanotubes were synthesized by a self-assembly method under relatively dilute hydrochloric acid (HCl) solution. Scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and UV-Vis-NIR spectroscopy were employed to characterize the morphology and molecular structure of the PANI products. SEM images show that the PANI nanotubes have uniform morphology and form compact coating on the substrate surface. For comparison, aggregated PANI was also synthesized by conventional polymerization method. The performance of the PANI products on carbon steel was studied using eletrochemical measurement and immersion corrosion experiment in 3.5 wt% NaCl aqueous solution. The corrosion potentials of carbon steel samples increase by 0.196 V and 0.060 V after coated with PANI nanotubes and aggregated PANI, respectively, and the corrosion currents density decrease by about 76.32% and 36.64%, respectively. The 6-day immersion experiment showed that the carbon steel samples coated by PANI nanotubes showed more excellent anticorrosion performance, because the more compact coating formed by PANI nanotubes may inhibit the corrosion process between the anodic and cathodic.

Barrier and passivation effects of 2D PANI@JNSs Janus nanosheets in epoxy anticorrosion coating

“…The peak at 1496 cm −1 is attributed to C=C stretching of benzenoid rings 18 . In addition, the appearance peaks at 1300 and 1238 cm −1 are assigned to the C‐N stretching of quinoid rings, while the peaks at 1138 and 801 cm −1 are corresponded to the aromatic C‐H in‐plane bending and the out‐of‐plane deformation of C‐H 27,34,35 …”

“…33 The peak at 1496 cm À1 is attributed to C=C stretching of benzenoid rings. 18 In addition, the appearance peaks at 1300 and 1238 cm À1 are assigned to the C-N stretching of quinoid rings, while the peaks at 1138 and 801 cm À1 are corresponded to the aromatic C-H in-plane bending and the out-of-plane deformation of C-H. 27,34,35 Figure 2e,f show the TG and DTG curves of JNSs and PANI@JNSs. JNSs contain three weight loss stages at about 25-116 C, 116-265 C and 265-575 C, which are respectively corresponded to the removal of free water, the elimination of bonding water and the decomposition of organic groups as amino group, carbonyl groups, double bonds and saturated alkyl groups.…”

Insights Into the Application of Polyaniline-Based Composites in Environmental Engineering

“…Replacing toxic or expensive inhibitors with some organic compounds represents the desired goal of many scientists. PANI, as a target material in this paper, (Tian et al, 2014;G. Yang et al, 2022), is among the most extensively researched ECPs in corrosion inhibition of ferrous and non-ferrous materials.…”

Tunable electrical resistance of polyaniline and its correlation to morphological properties and surface functional groups

“…Another recent work by Yang et al . reported that tube‐like PANI was successfully formed in dilute acid media; the formed PANI showed excellent anticorrosion properties owing to the formation of a compact coating on the substrate surface 25 . Apparently, the synthesis conditions of COP are worth investigating as PANI with different morphological and electrical properties is needed for different applications.…”