Electrochemical Formation Mechanism of Microdroplets on Pure Iron

Tang, Xiao; Li, Juanjuan; Wu, Yuqi; Hu, Hao; Ran, Chao; Li, Yan; Fan, Haiming

doi:10.3389/fchem.2021.610738

Cited by 3 publications

(4 citation statements)

References 24 publications

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“…Spreading occurred at the same high speed on both sides (about 4 mm/h) and then stopped after about 30 min, keeping a circular contact line. Another interesting feature is a thin superficial propagating front with the formation of peripheral micro-droplets, in agreement with the previous observations of Tsuru et al 21 , 25 . Tang et al .…”

Section: Resultssupporting

confidence: 91%

“…Tang et al . suggested that the initiation and propagation of these micro-droplets could influence the corrosion process in itself 25 . Side views allowed us to monitor the front position X front versus time on both sides of the droplet.…”

Section: Resultsmentioning

confidence: 99%

“…Both electrochemical reactions at the metal surface and further reactions inside the liquid droplet produce a dynamical system with spatial chemical gradients, potential gradients, diffusion and convection of species together with water movements 21 – 23 . However, only a little is known about the droplet spreading due to corrosion, e.g., lateral expansion of a NaCl-containing droplet concomitant with pit openings on a Cu surface 24 , formation of micro-droplets and lateral expansion of a thin water layer around the primary droplet in high-humidity conditions 21 , expansion of micro-droplets 25 , and influence of CO 2 level on the secondary spreading dynamics 26 .…”

Section: Introductionmentioning

confidence: 99%

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Corrosion-driven droplet wetting on iron nanolayers

Ricard,

Restagno,

Jang

et al. 2023

Sci Rep

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The classical Evans’ drop describes a drop of aqueous salt solution, placed on a bulk metal surface where it displays a corrosion pit that grows over time producing further oxide deposits from the metal dissolution. We focus here on the corrosion-induced droplet spreading using iron nanolayers whose semi-transparency allowed us to monitor both iron corrosion propagation and electrolyte droplet behavior by simple optical means. We thus observed that pits grow under the droplet and merge into a corrosion front. This front reached the triple contact line and drove a non radial spreading, until it propagated outside the immobile droplet. Such chemically-active wetting is only observed in the presence of a conductive substrate that provides strong adhesion of the iron nanofilm to the substrate. By revisiting the classic Evan’s drop experiment on thick iron film, a weaker corrosion-driven droplet spreading is also identified. These results require further investigations, but they clearly open up new perspectives on substrate wetting by corrosion-like electrochemical reactions at the nanometer scale.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion-driven droplet wetting on iron nanolayers

Ricard,

Restagno,

Jang

et al. 2023

Sci Rep

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“…Such studies have revealed that cathodic polarization accelerates micro-droplet formation regardless of metal type, electrolyte species, composition of air, and environmental humidity. Additionally, Tang et al [35] developed a mechanical model for micro-droplet formation consisting of three steps: (i) horizontal movement from the primary droplet along the metal surface, (ii) evaporation from the primary droplet and recondensation on the metal surface, and (iii) condensation of moisture from the air. Bian et al [36], on the other hand, studied the change in the coverage range of micro-droplets on metal surfaces during early atmospheric corrosion through optical microscopy.…”

Section: Introductionmentioning

confidence: 99%

The AA7075–CS1018 Galvanic Couple under Evaporating Droplets

Montoya,

Genesca,

Montoya

2024

CMD

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The galvanic corrosion behavior of the AA7075–CS1018 couple was examined in dynamic electrolytes using the ZRA technique. A modified electrochemical setup was developed to support the use of thin-film gel and liquid electrolytes on metallic surfaces. This allowed the collection of chemical information, left behind by the liquid electrolyte during evaporation, through a thin-film gel. The analysis of the gel electrolyte film confirmed the acidification on AA7075 and the alkalinization on CS1018 but also offered novel insights on their dependence on the galvanic current. The galvanic current was proportional to the initial NaCl concentration in the range of 0.01 to 0.06 M. However, due to continuous evaporation, the NaCl concentration increased, limiting oxygen diffusion and decreasing the galvanic current, especially for electrolytes exceeding 0.06 M. The galvanic current was determined by considering the dynamic evolution (caused by the evaporation of the electrolyte film) of both the thickness of the electrolyte and its concentration.

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Galvanic Corrosion Behavior of the X80 Steel Welded Joint

Li,

Sang,

Yang

et al. 2024

Coatings

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Wire beam electrode techniques and classical electrochemical techniques were used to investigate the effect of the area ratio of each part of the welded joint on the galvanic corrosion behavior. The results showed that the order of the corrosion current density of the different regions in the simulated X80 steel welded joint was as follows: coarse-grained heat-affected zone > fine-grained heat-affected zone > intercritical heat-affected zone > base metal > weld metal. As the area ratio of weld metal increased, the galvanic potential shifted positively, the maximum anode galvanic current density increased and the main anode galvanic effect increased. On the other hand, as the area ratio of the base metal and the heat-affected zone decreased, the coupled potential shifted negatively and the maximum anode galvanic current density decreased. The galvanic corrosion intensity of the simulated X80 steel welded joint increased as the area ratio of the weld metal decreased and increased as the area ratio of the heat-affected zone and base metal increased. To enhance corrosion resistance, it is advisable to choose a shape with a larger groove to increase the WM area in the welded joint. Additionally, selecting a welding method with lower heat input and a higher energy density can help reduce the HAZ area in the welded joint.

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Electrochemical Formation Mechanism of Microdroplets on Pure Iron

Cited by 3 publications

References 24 publications

Corrosion-driven droplet wetting on iron nanolayers

Corrosion-driven droplet wetting on iron nanolayers

The AA7075–CS1018 Galvanic Couple under Evaporating Droplets

Galvanic Corrosion Behavior of the X80 Steel Welded Joint

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