The Application of Electrochemical Noise for the Study of Metal Corrosion and Organic Anticorrosion Coatings: A Review

Abstract

The electrochemical noise technology and its application in the field of corrosion research are described in this paper. First, the concept, measurement method and data analysis of electrochemical noise are introduced. Then, we discuss the judgment of uniform corrosion, local corrosion and passivation through electrochemical noise. At the same time, electrochemical noise can also distinguish different local corrosion forms, such as pitting corrosion and crevice corrosion. Secondly, the mechanism and chemical kinetics of using electrochemical noise to study the pitting process are discussed. For anticorrosion coatings, electrochemical noise can give the corrosion situation and peeling degree under the coating, and then evaluate the anticorrosion performance of the coating. Finally, while discussing the application prospects of the technology, we also point out the ideal assumptions and data reliability problems currently faced by electrochemical noise technology.

Superhydrophobic Non-Metallic Surfaces with Multiscale Nano/Micro-Structure: Fabrication and Application

“…The upper surface of the lotus leaf possesses an excellent waterrepellency property as a result of its well-organized hierarchical structures from the nano to the micrometer scale and a wax-like coating that contributes to a large contact angle and a small roll-off angle. This observation reveals two crucial characteristics for achieving superhydrophobicity on a solid surface, nano/micro-structured topography and a low surface energy [17,18]. Among them, nano/micro-structured topography pertains to the array of concave-convex structures occurring at micro-and nano-scales, resulting in a reduction in the contact area between the liquid and the surface.…”

Adsorption of Glucose Molecules on Stainless Steel Enables Ni‐Rich Passivation Film

“…The passive films with various thickness, composition, density, and morphology are prepared by changing conditions such as applied potential/current, potential polarization method, electroly-sis time, electrolyte concentration, temperature, and electrode gap. [16][17][18][19][20] As mentioned above the example of the chromium rich surface, the nature of the passivation film is significantly influenced by the dissolution behavior. One general feature of dissolution previously done on well-defined single crystal surfaces is that small organic molecules dissolved in solutions dramatically affect the dissolution (or growth) of crystals.…”

“…Alternatively, passivation films are electrochemically prepared by anodic oxidation. The passive films with various thickness, composition, density, and morphology are prepared by changing conditions such as applied potential/current, potential polarization method, electrolysis time, electrolyte concentration, temperature, and electrode gap [16–20] …”

Data Mining Applied to the Electrochemical Noise Technique in the Time/Frequency Domain for Stress Corrosion Cracking Recognition

“…Among the several electrochemical techniques, electrochemical noise (EN) could potentially be considered most suitable for the assessment of damage evolution during SCC. Because this technology relies on spontaneous current and potential fluctuations created by corrosion processes, one of its primary advantages is its non-invasiveness [5,6].…”

“…Electrochemical noise (EN) can be applied to monitor and identify, in situ, the corrosion processes of metallic materials [7], and additionally monitor and assess the type and rate of corrosion in different harmful environments [8]. It can also be used to monitor the durability of coated metals [6,9]. Furthermore, this technique can detect localized corrosion, which affects small areas of the metal surface, as well as uniform corrosion, which affects the whole surface [10].…”