Multifunctional self-healing polymeric nanocomposite coatings for corrosion inhibition of steel

Assessment of Self-Healing Epoxy-Based Coatings Containing Microcapsules Applied on Hot Dipped Galvanized Steel

“…The smallest R ct value is observed at the 5 h after which an improvement follows till the 96 h of exposure (Figure 9C). The recovery of the charge transfer resistance from the smallest value observed is equal to 1,465% (Ubaid et al, 2019; increased from 14.8 to 231.71 k cm 2 ).…”

“…The R ct values present a progressive increment after 8 h of immersion (Figure 8C), while at the same time interval the interlayer resistance (R int ) is also increased, indicating the formation of a stable protective oxide layer (Figure 8B). The overall recovery of R ct value increased 144% from the first till the 96th hour of immersion, from 341.53 to 834.7 k cm 2 , respectively (Ubaid et al, 2019). The pore resistance (R coat ) for the scribed Epoxy-CSmc continuously decreases as the immersion time elapses and the corresponding capacitance values (C coat ) continue to increase, indicating the progressive damage of the coating due to successive electrolyte ingress (Figure 9A).…”

“…EIS is used as a powerful tool to investigate the barrier properties of the coating systems developed in the current study and to assess the impact of the addition of a liquid rubber polymer either as a container surface modified or as an additive incorporated in free form in the epoxy matrix. As it has been well-documented previously in literature, the magnitude of impedance modulus at low frequency (|Z| 0.01 Hz) can be used to assess the overall anti-corrosive behavior of an organic coating system, while the charge transfer resistance (R ct ) indicates the resistance to a flow of charge, electronic or ionic, which is inversely proportional to the corrosion rate underneath the coating and its enhancement is associated with self-healing effects (Zhang et al, 2004;Zheludkevich, 2009;Borisova et al, 2013;Meng et al, 2015;Njoku et al, 2017;Ubaid et al, 2019). Figure 6 illustrates the Bode diagrams of (a) the impedance plot vs. frequency and (b) the phase angle diagram vs. the frequency resulting from the exposure of intact coatings to artificial sea water (ASTM D 1141-98) over a period of 223 days.…”

Recently Emerging Nanotechnological Advancements in Polymer Nanocomposite Coatings for Anti-corrosion, Anti-fouling and Self-healing

“…They include; halloysite [143] , ion exchanging organically based resins [144] , nanocontaining materials from polyelectrolyte based shell [145] , layered double hydroxide (LDH) conductive polymeric matrix [146] , montmorillonite [147] , and mesoporous inorganically focused materials [148] . Varing routes of attaining SH behavior have been exposed, relative to encapsulation [149] , reversibility chemistry [150] , micro-vascular complexes [151] , nanoparticulate phasial separation [152] , polymeric ionomers [153] , hollow fibres [154] , and monomeric separation [155] .…”

Design of CNS-Li2SiO3 Permeable Protective Coatings and Effects on Mortar Matrix

“…Meanwhile, environmental effects, such as wind-sand erosion or physical wear, will accelerate the destruction of the protective layer and subsequent corrosion of steel bars. At present, a series of protection measures for concrete structures are proposed, including various mineral admixtures, corrosion inhibitor incorporation, as well as anti-corrosion coatings for steel and concrete surfaces [3][4][5][6]. Pre-treatment for the concrete surfaces is an economical and effective approach among the types of protective measures [7].…”