Enhanced adhesive and anti-corrosive performances of polymer composite coating for rusted metallic substrates by capillary filling

Anticorrosion Protection of New Composite Coating for Cobalt-Based Alloy in Hydrochloric Acid Solution Obtained by Electrodeposition Methods

“…This SDS surfactant, applied in polymerization as a "dopant ion", can have a substantial influence, changing the ion selectivity by contributing to the conductivity of polymer. The presence of the hydrocarbonate chains of SDS that "competitively adsorb" over the cobalt alloy substrate impedes the active centers and, as a result (effect), the Cl − corrosive agent is obstructed from attacking the cobalt alloy surface, and protection is achieved [23][24][25][26][27]39,51]. Determinations (measurements) indicated that the corrosion speed of the P3MPY-SDS/P2MT-covered cobalt alloy was about ~10 times less than that noted for the uncoated cobalt alloy It is clear that these coatings hindered the effect of the attacking element (HCl) on the cobalt alloy.…”

“…Analyzing Figures 5-7 and Tables 1-3, it is indicated that the lowest corrosion speed and the highest protection performance were obtained by the P3MPY-SDS/P2MT composite at 0.9 V and 1.0 V, at current densities of 0.5 mA/cm 2 and 1 mA/cm 2 (at a 5:1 molar ratio, t = 20 min) at current density (at 5:1 and 1:5 molar ratios), and a very good defense was achieved at 1.0 V and 1 mA/cm 2 (at a 1:5 molar ratio, t = 10 min) versus the uncoated substrate in a 1 M HCl environment. The corrosion processes of the composite-coated cobalt alloy and the bare sample in the HCl medium can be effectuated as follows [5,[23][24][25][26][27]35,[52][53][54][55][56][57][58]:…”

“…Products dissolved in the medium as oxygen and hydrogen ions are reduced by electrons accepted from the metal in a cathodic process. The corrosion processes of the composite-coated cobalt alloy and the bare sample in the HCl medium can be effectuated as follows [5,[23][24][25][26][27]35,[52][53][54][55][56][57][58]:…”

“…A higher rating of the "n" is connected to a lower degree of roughness of the area i.n., and the inhomogeneity of the zone is diminished. The CPE can be resistance when n = 0, Y0 = R), capacitance as n = 1 (Y0 = C), and inductance when n = −1 (Y0 = 1/L) or Warburg impedance as n = 0.5 (Y0 = W), as established for the evaluation of n [8,13,[23][24][25][26][27]51]. EIS determinations present that the charge transfer resistance, Rct, increased and the double layer capacitance, Cdl, decreased due to the coating.…”

“…These composite coatings frequently increase the endurance of metals in the face of several aggressive factors. The effectiveness of these defensive layers that ensure a barrier on the surface can be determined by different constituents: the type of conducting polymer, the electrochemical deposition practice that was employed on the electrode substrate, and the corrosive media [19][20][21][22][23][24][25][26][27]. The use of electropolymerization procedures, nanostructured coverings, the implementation of inorganic-organic coatings, and cathodic and anodic defenses are practices for the anti-corrosion defense of metals and their alloys.…”