Corrosion Protection of Q235 Steel Using Epoxy Coatings Loaded with Calcium Carbonate Microparticles Modified by Sodium Lignosulfonate in Simulated Concrete Pore Solutions

Abstract

In this study, calcium carbonate (CaCO3) microparticles having pH-sensitive properties were loaded with sodium lignosulfonate (SLS), a corrosion inhibitor. Scanning electron microscope (SEM), UV–VIS spectrophotometer (UV-vis), X-ray diffraction (XRD), and attenuated total reflection-Fourier-transform infrared spectroscopy (ATR-FTIR) were applied to evaluate the properties of the synthetic microparticles. This material could lead to the release of corrosion inhibitor under different pH conditions of the aqueous media. However, the extent of release of the corrosion inhibitor in the acidic media was higher, leading to enhanced shielding effect of the Q235 steel. These microparticles can serve as anti-corrosion additive for epoxy resin-coated Q235 steel. Electrochemical experiments were used to assess the anti-corrosive ability of the epoxy coatings in simulated concrete pore (SCP) solution, confirming the superior corrosion inhibition of the epoxy coating via incorporation of 5 wt % calcium carbonate microparticles loaded with SLS (SLS/CaCO3). The physical properties of coating specimens were characterized by water absorption, contact angle, adhesion, and pencil hardness mechanical tests.

Effect of additions of anticorrosive pigments on the cathodic delamination and wear resistance of an epoxy powder coating

“…The present results are consistent with other research using microadditions. For instance, CaCO 3 microcontainers on epoxy coating, in the same amount and with a similar sieve size, do not change the hardness of the coating [53], although the pencil method is used and this technique is not as accurate as microhardness for detecting small differences. The addition of 6 % SiC microparticles to an epoxy resin only slightly increased the Shore D hardness of the material [54].…”

Study of nano-ZnO improvement of the mechanical properties and corrosion resistance of modified-SiO2/PTFE superhydrophobic nanocomposite coatings by one-step spraying

“…The adhesion level of the coating without scratch dropping can be classified as 0, while the coating surface with the lowest adhesion can be classified as 5. 34…”

“…The adhesion level of the coating without scratch dropping can be classified as 0, while the coating surface with the lowest adhesion can be classified as 5. 34 2.3.4 Pencil hardness mechanical test. The pencil used is of different hardness and can be used to detect the scale of the superhydrophobic material itself.…”

Micro-particle entrainment from density mismatched liquid carrier system

“…Dip coating can also deliver particles in complex (e.g., bifurcated or branched) geometries such as refractory material coat for foundry cavity 19 and bio-compatible polymer coat to construct synthetic blood vessels 1 . Aditionally, dip coating is often used for tissue scaffolds fabrication 2 , porous structure joining 20 , 21 , oil/water separation 22 , surface protection 23 – 25 , soft robotics locomotion 26 and flexible electronics isolation 3 .…”