Effect of Asymmetric Epoxy Coating/Metal Electrodes on the Electrochemical Noise Measurements Under Marine Alternating Hydrostatic Pressure

Meng, Fanning; Liu, Yushan; Liu, Li; Cui, Yu; Wang, Fuhui

doi:10.3390/coatings9120852

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…As reported in the literature [23] , [24] , [25] , shot noise signals can be analysed to obtain two parameters: the frequency ( f n ) of corrosion events and the charge ( q ) generated during corrosion events. These parameters can be calculated as follows [26] :

where A denoted the electrode area, B denoted the Stern-Geary coefficient, ψ E and ψ I represented the power spectral densities of potential and current noise at low frequencies, respectively.…”

Section: Methodsmentioning

confidence: 99%

Effects of cavitation erosion-induced surface damage on the corrosion behaviour of TA31 Ti alloy

Qiao

Zhang

et al. 2023

Ultrasonics Sonochemistry

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Section: Methodsmentioning

confidence: 99%

Effects of cavitation erosion-induced surface damage on the corrosion behaviour of TA31 Ti alloy

Qiao

Zhang

et al. 2023

Ultrasonics Sonochemistry

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“…In the corrosion process, the current is carried by discrete carriers, which will produce shot noise. The movement of discrete carriers is a relatively independent and random process [ 32 ]. Therefore, two characteristic parameters, f n and q, can be extracted from the shot noise signal of corrosion.…”

Section: En Analysismentioning

confidence: 99%

Understanding the Corrosion Behavior of Nickel–Aluminum Bronze Induced by Cavitation Corrosion Using Electrochemical Noise: Selective Phase Corrosion and Uniform Corrosion

Qiao

Zhang

et al. 2023

Materials

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Nickel–aluminum bronze (NAB) is widely used to fabricate flow-handling components because of its good cavitation corrosion (CE) resistance and superior casting property. The existence of different phases, e.g., the α phase, β phase and κ phase, can cause significant selective phase corrosion on NAB. However, under the action of CE with different times, the influence of these phases on the corrosion behavior of NAB, including selective phase corrosion and uniform corrosion, needs to be further studied, which can contribute to a deep understanding of the CE mechanism of NAB in corrosive media. In this work, the corrosion behavior of NAB in 3.5 wt.% NaCl solution after different CE times was evaluated by electrochemical noise (EN), combined with scanning Kelvin probe force microscopy (SKPFM) and morphology analysis. The results showed that the corrosion behavior of NAB was closely associated with the variation in its complex microstructure after different CE times. Selective phase corrosion played a crucial role in the surface damage before 0.5 h of CE. With the prolongation of CE time, the stripping of κ phases decreased the degree of selective phase corrosion of NAB. As a result, both selective phase corrosion and uniform corrosion presented equal performances after 1 h of CE. However, after CE for 2–5 h, uniform corrosion had a dominant impact on the surface damage of NAB. Eventually, the corrosion mechanism of NAB after different CE times was clarified based on the relevant experimental results.

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“…First, the effectiveness of the electrochemical parameters measured by EN in the ZRA mode to test the SS corrosion degree should be determined. The electrochemical parameters include potential standard deviation, current standard deviation, and noise resistance [25,26].…”

Section: Electrochemical Equivalent Circuit Modelmentioning

confidence: 99%

Quantification of the Atmospheric Corrosion of 304 and 2205 Stainless Steels Using Electrochemical Probes Based on Thevenin Electrochemical Equivalent Circuit Model

Zhu

Song

et al. 2020

Trans. Tianjin Univ.

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Stainless steel (SS) is one of the most widely used engineering materials in marine engineering. However, its corrosion in the marine atmospheric environment due to the high concentration of Cl − is a problem. The SS corrosion is a threat to the development and security of marine industry; therefore, evaluating the corrosion resistance of SSs is necessary. In this work, atmospheric corrosion detection probes based on a symmetrical electrode system were used to study the corrosion behaviors of 304 SS and 2205 duplex stainless steel (DSS) in a simulated marine atmosphere. A theoretical model for electrochemical noise (EN) data analysis based on the Thevenin electrochemical equivalent circuit (EEC) model was established. The relationship between the EN characteristic parameters and the corrosion rate was obtained. The Thevenin EEC model analysis showed that the relationship between the noise resistance (R n ), the noise impedance [R sn (f)], and the impedance modulus (|Z(f)|) was R n ≈ R sn = √ 3 �Z(f )� . Thus, R n and R sn can be used as indicators for quantitative corrosion evaluation. The results of EN detection for the 304 SS and 2205 DSS showed that in a simulated marine atmospheric environment, the passive films on the two SSs were relatively intact at the initial exposure stage, and their dissolution rates were slow. The corrosion resistance of the 2205 DSS was higher than that of the 304 SS. With the deposition of Cl − on the SS surface, pitting was initiated and the dissolution rate increased. The pitting initiation process on the SS surface was random, and part of the active pores could be repassivated.

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Effect of Asymmetric Epoxy Coating/Metal Electrodes on the Electrochemical Noise Measurements Under Marine Alternating Hydrostatic Pressure

Cited by 5 publications

References 29 publications

Effects of cavitation erosion-induced surface damage on the corrosion behaviour of TA31 Ti alloy

Effects of cavitation erosion-induced surface damage on the corrosion behaviour of TA31 Ti alloy

Understanding the Corrosion Behavior of Nickel–Aluminum Bronze Induced by Cavitation Corrosion Using Electrochemical Noise: Selective Phase Corrosion and Uniform Corrosion

Quantification of the Atmospheric Corrosion of 304 and 2205 Stainless Steels Using Electrochemical Probes Based on Thevenin Electrochemical Equivalent Circuit Model

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