Studies of micromorphology and current efficiency of zinc electrodeposited from flowing chloride electrolytes

Vay, L. Mc

doi:10.2172/5351255

Cited by 3 publications

(4 citation statements)

References 38 publications

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“…The resolution achieved was about 1 I.tm [31]. McVay showed that nodules coalesce and elongate both downstream and upstream, though predominantly in the former direction [30]. The elongation is not uniform, and there is a strong preference for upstream and downstream nodules to join, even if there is some misalignment.…”

Section: Striated Zinc Electrodepositsmentioning

confidence: 98%

“…McVay [30,31] was the first to successfully observe the emergence of striae in situ. She combined a long-range microscope objective on a traveling stage with a video camera/cassette-recorder to record the growth of zinc nodules.…”

Section: Striated Zinc Electrodepositsmentioning

confidence: 99%

“…They begin to elongate in the direction of flow and form a 'string of pearls' downstream, as nodules in their wake tend to also be favored for growth. This 'string' smooths itself out until it becomes one of a number of parallel strands in a corrugated landscape [22][23][24][25][26][27]30]. Figure 1.1 shows striae obtained by Jaksic and Faltemier in both rotating disk and channel-flow cells, under conditions of both laminar and turbulent flow [ 17].…”

Section: Introduction and Scope Of Present Workmentioning

confidence: 99%

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Micro-scale mass-transfer variations during electrodeposition

Sutija¹

1991

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Section: Striated Zinc Electrodepositsmentioning

confidence: 98%

Section: Striated Zinc Electrodepositsmentioning

confidence: 99%

Section: Introduction and Scope Of Present Workmentioning

confidence: 99%

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Micro-scale mass-transfer variations during electrodeposition

Sutija¹

1991

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“…The videomicroscopy system, assembled in our laboratory and pictured in Figure 1, is composed of several elements (3). At the far left is the video monitor and the video recorder which store and display the image of the developing deposit.…”

Section: Equipment and Featuresmentioning

confidence: 99%

Application of Videomicroscopy to In Situ Studies of Electrodeposition

McVay

Müller

Tobias

1989

J. Electrochem. Soc.

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Interpreting the main effects on the efficiency and morphology for establishing a procedure of electrodepositing Zn from purified chloride SPL solutions

Zakiyya,

Illés,

Kékesi

2024

Preprint

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Detailed potentiodynamic and galvanostatic methods have been used to investigate the electrodeposition of Zn and to develop a reliable recovery method from a purified and concentrated spent pickling liquor (SPL) of hot dip galvanization. Applying various combinations of Zn concentration, pH, agitation, apparent current density (c.d.) and additional NaCl concentration, a uniform initial deposit could be observed at the cathode, however the subsequent dendrite formation and the development of protrusion at the edges were targeted for a deeper investigation. The potentiodynamic experiments, showed the importance of H2 evolution influenced by the electrolyte properties and the cathodic polarization. The cathodic current was dominated by Zn reduction in the pH > 2 range during the fast potentiodynamic runs of the 30 – 150 g/dm3 Zn concentration range in the stationary electrolyte. Increasing the Zn concentration could considerably improve the deposit morphology. In the long-term galvanostatic experiments the current efficiency increased with the increase of pH in the examined wide Zn concentration range but the c.d. needs optimization. A current efficiency (c.e.) of ~99% can be reached with an electrolyte of pH ~5, Zn concentration ~50 g/dm3 applying a c.d. in the 300 – 600 A/m2 range. At low (~10 g/dm3) Zn concentrations the rate of hydrogen evolution increases dramatically. The addition of NaCl can practically improve the c.e. if the Zn concentration is at least around 50 g/dm3. In contrast, this improvement is largely off-set by the negative effects of strong H2 evolution at as low Zn concentrations as e.g. 10 g/dm3. Higher NaCl additions or too high Cl- ion concentrations, however inhibit the cathodic reaction of the electroactive species by stronger chloro-complex formation. In this case the intensive H+ reduction causes hydroxide precipitation.

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Studies of micromorphology and current efficiency of zinc electrodeposited from flowing chloride electrolytes

Cited by 3 publications

References 38 publications

Micro-scale mass-transfer variations during electrodeposition

Micro-scale mass-transfer variations during electrodeposition

Application of Videomicroscopy to In Situ Studies of Electrodeposition

Interpreting the main effects on the efficiency and morphology for establishing a procedure of electrodepositing Zn from purified chloride SPL solutions

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