The behaviour of cadmium monocrystals and polycrystals in acid chloride solution

Tromans, Desmond; Foster, Bryant; Weinberg, F.

doi:10.1016/s0010-938x(97)00029-2

Cited by 6 publications

(6 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In support of this, previous studies on similarly oriented Cd monocrystals in acidic 0.1 M NaCl ͑pH 1.3͒ showed the anodic dissolution behavior to be independent of surface orientation. 17 Similar anodic Tafel behavior was exhibited by the ͑0001͒, ͑12 ¯10͒, and ͑101 ¯0͒ surface orientations. 17 Furthermore, anodic polarization studies conducted up to 200 A m 2 in the acidic solution produced roughened surfaces with symmetry effects unique to each orientation, 17 as observed in the later stages of pitting in the present study.…”

Section: C370mentioning

confidence: 64%

“…The observed b a was similar to a value of 27 Ϯ 2 mV reported previously for anodic behavior of Cd monocrystals in acidic ͑pH 1.3͒ 0.1 M NaCl solutions. 17 Increasing the potential in the passive region eventually caused a large increase in anodic current indicative of sustained film breakdown and pitting. The potential at which the sustained breakdown occurred, usually termed the pitting potential E pit , was not reproducible.…”

Section: C368mentioning

confidence: 99%

“…14 It is possible that an intermediate adsorbed Cd I state exists on the Cd surface before a second electron transfer step leading to an aqueous Cd II species. [15][16][17]…”

mentioning

confidence: 99%

See 2 more Smart Citations

Pitting Behavior of Passivated Cadmium Monocrystals

Tromans

2009

J. Electrochem. Soc.

View full text Add to dashboard Cite

A combination of aqueous thermodynamics, anodic polarization tests, and scanning electron microscopy was used to study the pitting behavior of Cd monocrystals in a phosphate-buffered (pH 11.2) solution of 0.1 M NaCl. Pitting occurred in the passive region where the most stable passive film was Cd(OH)2 . The film thickness was estimated to be ∼4×10−9m . Pitting potentials were not reproducible, being variable within surfaces of the same orientation and between different orientations. Variability was attributed to the effects of structural defects in the passive film and the potential scan rate influencing pit site nucleation and pit growth behavior. Sustained pitting was not possible below −0.472normalVSHE . Early stages of pitting produced crystallographic facets consistent with (0001), {101false¯0} , and {112false¯0} planes, with the morphology becoming increasingly complex with pit growth. pH decreased to below 8.5 in the growing pit and increased the influence of chloride species on localized dissolution behavior.

show abstract

Section: C370mentioning

confidence: 64%

Section: C368mentioning

confidence: 99%

See 1 more Smart Citation

Pitting Behavior of Passivated Cadmium Monocrystals

Tromans

2009

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…It is known that transport effects may control the b value of other metals during oxidation to the +2 state, as shown by recent studies on the oxidation of Cd to CdClt in acidic chloride solutions. 26 Limiting current behavior.-The initiation of L behavior in 1 M H2S04 occurred at potentials below E20 and nearer to ECUSO4.5H20 (+0.323 V5 in Table III), as shown by positive deviations from Tafel behavior in Fig. 3 and 4.…”

Section: Resultsmentioning

confidence: 92%

Active/Passive Behavior of Copper in Strong Sulfuric Acid

Tromans¹,

Ahmed²

1998

J. Electrochem. Soc.

View full text Add to dashboard Cite

A combination of thermodynamic analyses and potentiodynamic polarization tests have been used to study the anodic behavior of Cu in strong H2S04 solutions in the concentration range 1-10 M. The studies were supplemented by chemical analyses of surface films. It was found that concentration-dependent changes in the activity of water played a major role in determining the anodic behavior and relative stability of corrosion product films. The anodic Tafel slope decreased from -41 to -31 mV with increasing acid concentration. The onset of limiting current and active-passive behaviors at higher potentials was determined by the formation of films of hydrated copper sulfate, CuSO4xH2O, and not by formation of oxides. Limiting current behavior was observed in 1 M solutions, where the degree of hydration was x =5. Welldeveloped passivity occurred in 10 M solutions where x = 1. The results are relevant to industrial electrorefining operations for Cu and indicate that chloride contamination, if present in sufficient amounts, could cause the premature onset of limiting current behavior (anode "passivity") during refining.

show abstract

“…The only oxidation state considered was Cd II because a stable Cd I state has not been reported in aqueous solutions or any oxide/hydroxide (9). It is possible an intermediate adsorbed Cd I state exists on the Cd surface prior to a second electron transfer step leading to aqueous Cd II species (10)(11)(12).…”

Section: Introductionmentioning

confidence: 99%

Pitting of Passivated Cadmium Monocrystals

Tromans

2009

ECS Trans.

View full text Add to dashboard Cite

A combination of aqueous thermodynamics, anodic polarization tests and scanning electron microcopy was used to study the pitting behavior of Cd monocrystals in a phosphate buffered (pH 11.2) solution of 0.1 M NaCl. Pitting occurred in the passive region where the most stable passive film was Cd (OH)2. The initial film thickness was estimated to be ~4 x 10-9 m. Pitting potentials were not reproducible, being variable within surfaces of the same orientation and between different orientations. Variability was attributed to structural defects in the passive film playing a major role in pit site nucleation. Early stages of pitting produced crystallographic facets consistent with (0001), and planes, the morphology becoming increasingly complex with pit growth. The pH decreased in the growing pit and increased the influence of chloride species on localized dissolution behavior.

show abstract

The behaviour of cadmium monocrystals and polycrystals in acid chloride solution

Cited by 6 publications

References 27 publications

Pitting Behavior of Passivated Cadmium Monocrystals

Pitting Behavior of Passivated Cadmium Monocrystals

Active/Passive Behavior of Copper in Strong Sulfuric Acid

Pitting of Passivated Cadmium Monocrystals

Contact Info

Product

Resources

About