Testing of corrosion resistant fluoropolymer coatings

Effect of fluoride ions on Ti6Al4V alloy passivation in lactated Ringer's serum

“…7, includes the solution's resistance (R 3 ), the inner layer's capacitance (C 1 ), the resistance (R 1 ) and the outer layer's resistance (R 2 ), as well as a constant phase element (CPE) that replaces the outer layer's capacitance. The CPE takes into account the phenomena involved in the surface roughness and diffusion processes 20 . Table 4 presents the values of the parameters used in the simulated circuits.…”

Protection of copper against corrosion in simulated urban rain by the combined action of benzotriazole, 2-mercaptobenzimidazole and stearic acid

“…To fit the experimental data for modified copper samples, an approach has been taken that has been used for polymer-coated metals [44,45], oxide or mixed oxide/inhibitor polymer complexes on metal surfaces [10,11,27,31,[46][47][48] and self-assembled inhibitor layers of alkenthiols [33,49,50], aromatic thiols [51,52], dodecanethiol [35], dodecyl mercaptan [34], n-tetradecanoic acid [53] and potassium decanoate [54] on copper. The self-assembled layers were formed mainly by pre-treatment of an acid etched ground copper sample in an ethanol solution of inhibitor and then measured in test solution [33][34][35][49][50][51][52][53].…”

Role of Self-Assembled Monolayer of 1,2,3-Benzotriazole in Protecting Copper Artifacts Covered with Sulfide Film

“…39 As mentioned above, it is believed that BTAH forms protective film on the copper surface due to the interaction of a lone pair of electrons of the N atom of the triazole ring with a vacant d-orbital of the copper atom. 23 In case of developing BTAH SAM on tarnished copper surfaces, the molecule of BTAH may migrate through the defects in the sulfide film on the metal surface and block them through adsorption. Additionally, BTAH may also compete with the Sion for adsorption on sites already covered with sulfide film: The above-described mechanism for the formation of SAM on a tarnished copper surface is supported with the results described in Figures 1 and 2 and Table 2, where charge-transfer resistance for BTA SAM and TAR SAM are comparable.…”

“…To have a quantitative evaluation on the performance of coatings on metals surfaces and an explanation of results, different types of equivalent electrical circuits incorporating capacitance, charge-transfer, and Warburg resistances have been proposed by different authors. [23][24] Considering that SAM-deposited surfaces behave like organic coatings, such circuits were modeled, and best-fitting methods were used to determine electrical components of these circuits. Since all the studied systems in the present communication exhibit depressed semicircles at higher frequencies (indicating an imperfect capacitor at the interface), it was considered more appropriate to use a constant phase element (CPE) model instead of a perfect capacitor model to determine impedance parameters.…”