Electrochemical Noise Chaotic Analysis of NiCoAg Alloy in Hank Solution

Abstract

The potential and current oscillations during corrosion of NiCoAg alloy in Hank solution were studied. Detailed nonlinear fractal analyses were used to characterize complex time series clearly showing that the irregularity in these time series corresponds to deterministic chaos rather than to random noise. The chaotic oscillations were characterized by power spectral densities, phase space, and Lyapunov exponents. Electrochemical impedance was also applied the fractal dimensions for the corroded surface was obtained, and a corrosion mechanism was proposed.

Characterization of a “Smart” Hybrid Varnish Electrospun Nylon Benzotriazole Copper Corrosion Protection Coating

“…Coating impedance parameters R 1 and Q 1 provide information regarding coating dielectric properties evolution. R 1 exhibits certain proportionality correlation with metal corrosion rate under damaged coating conditions, presenting a decrease in their values as a function of time of immersion, while the coating capacitance values (Q 1 ) tend to increase [17,20,21]. Under accelerated degradation conditions, such as in artificially damaged coatings (as in our case), the coating resistance increases due to porosity blockage or obstruction of the damaged area by the corrosion products, as well as the corrosion inhibitor compound stored in the electrospun coating [22,23].…”

“…Coating capacitance Q 1 depends on the water quantity incorporated in the coating matrix as it is mentioned, and hence it was proposed as a method of interface metal coating deterioration monitoring [20]. Q 1 trend to increase as a function of exposure to the corrosion medium has been interpreted as a consequence of corrosion; therefore their values can be influenced by this process [21].…”

“…This is probably related to the diffusion and adsorption of the inhibitor, reacting with the copper ions promoted by oxidation and the protective complex copper BTAH film formation. The mass transport controls the reaction kinetics, and the depressed semicircles experimentally obtained are related to the heterogeneities of the surface and distorted distribution of the electric field [20,21]. The impedance response from the coating exposed to the corrosive media produces changes in the high frequency impedance spectra due to the formation of a polymer-metal interface from the solution entering through the polymer film (varnish) pores and the electrospun nylon interstices.…”

Smart Protection of Polymer-Inhibitor Doped Systems

“…[37][38][39][40][41][42] Figure 12.3 presents the fractal dimension protection of the steel, corrosion potential, pitting potential, passivation current density obtained using potentiodynamic polarization measurements. [37][38][39][40][41][42] Figure 12.3 presents the fractal dimension protection of the steel, corrosion potential, pitting potential, passivation current density obtained using potentiodynamic polarization measurements.…”

Electrochemical Noise Analysis of Type 316L Stainless Steel in a LiBr + Ethylene Glycol + H2O Solution

“…[21][22][23] Corrosion is a complex phenomenon, as evidenced from the electrochemical noise oscillations, especially during localized corrosion where transitions between stochastic (probabilistic) and deterministic (probabilities not involved) processes can occur, as explained. 25 Sometimes, localized attack consists of two stages: nucleation consisting of probabilistic behavior and propagation, which is a deterministic process. These are revealed by the presence of persistence (clear trends in behavior, same mechanism) or anti-persistence conditions (change in the previous behavior, change in mechanism).…”