Effects of some additives on the corrosion behaviour and preferred orientations of zinc obtained by continuous current deposition

Mouanga, M.; Ricq, Laurence; Douglade, J.; Berçot, P.

doi:10.1007/s10800-006-9255-3

Cited by 75 publications

(52 citation statements)

References 31 publications

(31 reference statements)

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“…Pure zinc deposit (Fig. 3d) presents the morphology commonly observed from the zinc deposit obtained from an acidic chloride bath [16,18]. Also, zinc deposits have a clear grey colour (Fig.…”

Section: Morphology and Texture Of Zinc-cobalt Depositsmentioning

confidence: 73%

“…These compounds can adsorb on the growing deposits or on the substrate with an impact on deposit properties and the electroplating process. In our previous studies, we have investigated the influence of thiourea and urea on the zinc deposits under continuous current deposition and from a chloride bath [16]. The use of thiourea produced deposits with a finer grain size and the preferred crystallographic orientations were modified; whereas, a non-improvement in corrosion resistance was observed.…”

Section: Introductionmentioning

confidence: 99%

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Effects of thiourea and urea on zinc–cobalt electrodeposition under continuous current

2007

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The effect of thiourea and urea on zinc-cobalt alloys obtained from chloride baths under continuous current deposition are described and discussed. The deposit morphology was analyzed using Scanning Electron Microscopy (SEM) and an X-Ray Diffraction (XRD) was used to determine the preferred crystallographic orientations of the deposits. The use of additives does not refine the grain size of the Zn-Co alloy and an especially porous alloy was produced in the presence of urea. The preferred crystallographic orientations of zinc-cobalt alloys do not change in the presence additives. Zinc-cobalt alloys were without texture in the presence and absence of additives. Also, in the absence of additive and in the presence of urea, the XRD lines of the Zn-Co alloys are slightly shifted with respect to the pure zinc XRD lines, whereas, in the presence of thiourea, the XRD lines are not shifted. The alloy composition was examined using Energy Dispersive X-ray Fluorescence Spectroscopy (EDXRF). The percentage of cobalt in the alloy decreases slightly from 1.04 to 0.91 wt.% in the presence of urea and in the presence of thiourea it increases from 1.04 to 7.70 wt.%. Voltammetric studies show that thiourea increases the reduction rate of cobalt. This explains the increase in cobalt percentage in the alloy in the presence of thiourea.

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Section: Morphology and Texture Of Zinc-cobalt Depositsmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Effects of thiourea and urea on zinc–cobalt electrodeposition under continuous current

2007

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“…The index 0 refers to the intensities for the standard zinc sample (JCPDS card number: 00-004-0831) [28].…”

Section: Methodsmentioning

confidence: 99%

Synergistic effect of additives on bright nanocrystalline zinc electrodeposition

et al. 2010

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The influence of additives like cetyltrimethylammonium bromide (CTAB) and Ethyl vanillin (EV) on zinc electrodeposition from acid sulfate bath was systematically investigated by scanning electron microscopy, X-ray diffraction, and voltammetric techniques. The result shows the existence of interaction between CTAB and EV. They exhibited synergistic effect to produce bright nanocrystalline zinc coating on steel surface. The combined effects of these two compounds on deposition overpotential, hydrogen evolution, zinc ion diffusion, and surface coverage were discussed. The morphological and orientational changes occurred in electrodeposit were presented. Also the nucleation mechanism exhibited by zinc during electrodeposition in the presence of additive was examined.

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“…Zinc is widely used for corrosion protection of steel due to its sacrificial aim: its redox potential being more negative than that of steel under the same conditions, zinc deposits behave as sacrificial anodes and thus offer a cathodic protection to the steel substrate [1][2][3][4][5]. Galvanic corrosion between zinc and steel has been the subject of numerous investigations.…”

Section: Introductionmentioning

confidence: 99%

Galvanic corrosion between zinc and carbon steel investigated by local electrochemical impedance spectroscopy

Mouanga

Puiggali

Tribollet

et al. 2013

Electrochimica Acta

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Nadine Pébère, et al.. Galvanic corrosion between zinc and carbon steel investigated by local electrochemical impedance spectroscopy. Electrochimica Acta, Elsevier, 2013Elsevier, , 88, pp.6-14. <10.1016Elsevier, /j.electacta.2012 b s t r a c tThe study of galvanic coupling between two metals is still a relevant topic, particularly in aerospace and automotive industries. The development of local electrochemical techniques leads to a better understanding of the phenomena occurring at the interfacial zone. Galvanic coupling between carbon steel and zinc was investigated by local electrochemical impedance spectroscopy (LEIS) in a 0.06 g L −1 NaCl solution. Voltammetry and conventional electrochemical impedance experiments were also performed to better analyze the local impedance data. Local measurements carried out at a fixed frequency showed that zinc dissolution was more significant at the steel/zinc interface. A particular shape of the local impedance diagram was observed above the zinc surface with the presence of a large inductive loop in the low-frequency range. Numerical simulations, performed by using finite element method, allowed the local experimental diagrams obtained over the zinc sample to be validated taking into account the radial contribution of the current between both materials in galvanic coupling.

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Effects of some additives on the corrosion behaviour and preferred orientations of zinc obtained by continuous current deposition

Cited by 75 publications

References 31 publications

Effects of thiourea and urea on zinc–cobalt electrodeposition under continuous current

Effects of thiourea and urea on zinc–cobalt electrodeposition under continuous current

Synergistic effect of additives on bright nanocrystalline zinc electrodeposition

Galvanic corrosion between zinc and carbon steel investigated by local electrochemical impedance spectroscopy

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