Abstract
In this study, the effect of pure and modified hexagonal boron nitride (h-BN) nanosheet incorporation on the stability, viscosity, and electrochemical behavior of a waterborne emulsion acrylic coating was studied. The functionalization of h-BN nanoplatelets with polyacrylic acid (PAA) plasma polymerization was performed, and the successful surface modification was determined through water dispersion testing, Fourier transform infrared spectroscopy and thermogravimetric analysis, X-ray photoelectron spectroscopy, and also by transmission electronic microscopy. Later, the stability and viscosity properties of emulsion nanostructured acrylic coatings, which were previously prepared by an ultrasound-assisted mixing system, were analyzed using zeta potential and rheometry testing, respectively. The electrochemical behavior was analyzed by electrochemical impedance spectroscopy. The results prove an effective deposition of PAA films on the h-BN surfaces, which enhanced the stability and viscosity acrylic of nanostructured coatings due to the interactions between the h-BN nanoplatelets surface and emulsion acrylic paint and also with the thickener additives. On the other hand, the electrochemical analysis demonstrated a significant increase (two orders of magnitude) in corrosion resistance in the acrylic nanostructured coatings with 1 wt.% of unmodified and modified h-BN nanoplatelets concerning pure acrylic paint due to a barrier protection mechanism of corrosion inhibition. Therefore, the results demonstrate that the surface modification of h-BN by plasma polymerization (green technology) helped to solve the low dispersibility issue of BN nanosheet surfaces in a waterborne polymer matrix to obtained green nanostructured acrylic coatings with the right balance in in-can properties and corrosion inhibition of AISI 304 stainless steel.
Highlights
Corrosion is one of the main problems related to the deterioration of all the steel-made metallic components, and this carries to repair or replace involving in a significant impact on society [1]
This behavior was attributed to the plasma-modified nanoparticles at different times of storage in water. It could be seen hydroxyl and carbonyl functional groups corresponding to polyacrylic acid (PAA) that were deposited on the surface that after the sonication of nanoparticles, both samples were suspended in the aqueous solution, despite of the particles and resulting in a better interaction with water molecules
After standing for 168 h, the agglomerates and precipitation of the dispersion of hexagonal boron nitride (h-BN) could be found, whereas the dispersion of agglomerates and precipitation of the dispersion of h-BN could be found, whereas the dispersion of mh-BN was stable, and no visible precipitation was observed. This behavior was attributed to the mh-BN was stable, and no visible precipitation was observed. This behavior was attributed to the hydroxyl and carbonyl functional groups corresponding to PAA that were deposited on the surface of hydroxyl and carbonyl functional groups corresponding to PAA that were deposited on the surface the particles and resulting in a better interaction with water molecules
Summary
Corrosion is one of the main problems related to the deterioration of all the steel-made metallic components, and this carries to repair or replace involving in a significant impact on society [1] In this sense, the National Association of Corrosion Engineers (NACE) reported that, in 2013, the global economic loss due to corrosion was estimated to be USD 2.5 trillion [2]. Corrosion protection coatings have been developed with constituents such as hexavalent chromium [4], tributyltin [5], cadmium [6], cobalt [7] and copper [8] and used in different marine devices and maritime transports These compounds have been recently classified as toxic for the marine eco-system and carcinogenic to humans [3,9]. The coating industry is interested to find more environmentally friendly substitutes with greater efficiency and lower cost for these commercial but hazardous coating constituents [9]
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