Assessment of healed scratches in intrinsic healing coatings by AC/DC/AC accelerated electrochemical procedure

Effects of Graphene-Based Fillers on Cathodic Delamination and Abrasion Resistance of Cataphoretic Organic Coatings

“…The corrosion protection performance was evaluated using an accelerated AC-DC-AC method [52], whose cycles consisted of three steps, as shown in Figure 1: Clear coat 0.1 g-0.1 0.2 g-0.2 0.5 g-0.5…”

“…The AC-DC-AC method represents an accelerated cyclic test, consisting of a combination of EIS measurements (AC) and cathodic polarisation (DC), employed to study the adhesion between substrate and organic coatings [52,58,59]. In the past, this characterization technique has also been used for the optimization of the cataphoretic deposition process, determining the deposition voltages for the highest corrosion protection properties of an epoxy primer [60].…”

“…In the past, this characterization technique has also been used for the optimization of the cataphoretic deposition process, determining the deposition voltages for the highest corrosion protection properties of an epoxy primer [60]. The AC-DC-AC method has been proven to be able to provide comparable results obtained with other accelerated corrosion techniques, such as salt spray test, but in even shorter times [52,58]. The four sample series were thus subjected to several AC-DC-AC cycles, as described in Figure 1, and the evolution of the low frequency Bode modulus measured at 0.01 Hz, |Z| (0.01) was tracked.…”

“…The resistance to abrasion and wear is, in fact, a fundamental feature for a coating and its protective performances. Finally, the behavior of the samples in an aggressive environment was monitored by an EIS/cathodic polarization cycles (AC-DC-AC, alternating-direct-alternating current method [52]), and the cathodic delamination of the composite coatings from the steel substrate was evaluated using scanning kelvin probe (SKP) measurements.…”

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

“…According to the same recent review article, self-healing coatings can be categorized in two broad categories, autonomous and non-autonomous coating systems, depending on the mechanism of the onset of healing action (triggered or not). The most common self-healing mechanisms reported in literature are based on (i) polymerizable healants (Zhu et al, 2015;Balaskas et al, 2017), (ii) encapsulated corrosion inhibitors, (iii) reversible bonds, and (iv) reversible chain conformation (Abdolah Zadeh et al, 2016;Samiee et al, 2019), Thus, protective coatings can be characterized by damageresponsive functionalities which result in defect healing/sealing action and/or active corrosion protection by inhibiting corrosion reactions (Kakaroglou et al, 2016;Snihirova et al, 2016;Ulaeto et al, 2017).…”