Influence of the alloying component on the protective ability of some zinc galvanic coatings

Boshkov, N.; Petrov, Κ.; Kovacheva, D.; Vitková, S.; Nemska, S.

doi:10.1016/j.electacta.2005.03.049

Cited by 84 publications

(66 citation statements)

References 9 publications

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“…Zinc hydroxy chloride has a very low solubility, and ensures higher protective ability for Zn-Co alloy coatings [7,10]. We can easily conclude that the film obtained from bath containing 20 g l −1 of borax has the highest corrosion resistance among studied films.…”

Section: Resultsmentioning

confidence: 66%

“…Consequently, the increase in zinc dissolution causes its reaction with chloride ions in NaCl solution and formation of zinc hydroxy chloride, according to Eq. (5) [7,17].…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the cobalt content in the Zn-Co alloys, produced from aqueous coating baths, is still at low rates. In spite of the fact that there are numerous publications regarding Zn-Co alloy with low Co content [6][7][8][9][10][11], there has not been much work reported on Zn-Co alloys consisting of considerably higher Co contents. Most results reported on the electrodeposition of Zn-Co alloy coatings showed that the maximum amount of cobalt * e-mail: ikarahan@mku.edu.tr in their deposits was about 6-7 wt.% [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Borax Pentahydrate Addition to Acid Bath on the Microstructure and Corrosion Resistance of Zn-Co Coating

Karahan

2015

Acta Phys. Pol. A

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In this work, the Zn-Co coatings were synthesized on AISI 4140 steel and aluminum plates by using potentiostatic electrodeposition technique in sulphate-based acidic baths with 0, 20, 40 and 60 g l −1 of borax pentahydrate, as additive. The effect of borax pentahydrate on the microstructure of the samples was observed using scanning electron microscopy and X-ray diffractometer. The deposition process was investigated by cyclic voltammetry. The effect of borax pentahydrate on the corrosion resistance of the samples was studied by potentiodynamic polarization technique. The results have demonstrated, that the addition of borax pentahydrate was in favor of the growth of grains. The morphology of pyramidal islands on the surface was changed to a more flat structure. The results have also demonstrated that the effect of borax pentahydrate was not monotonous. With increasing concentration, the corrosion potential was at minimum and the charge transfer resistance Rt was at maximum for the sample obtained from the bath with 60 g l −1 of borax pentahydate, indicating that this sample showed the best corrosion resistance. It was found that current density first decreased and than increased, due to adsorption of a complex of borax pentahydrate and/or changes in the morphology, however, the initial deposition potential was not affected. The addition of borax pentahydrate to the bath led to formation of the best Zn-Co deposits, composed of coalesced globular fine grains, smaller than ≈2 µm in diameter. In addition, all of the studied Zn-Co deposits consisted of η phases. It is suggested that Zn-Co deposits produced in the bath containing 60 g l −1 of borax pentahydrate probably offer sacrificial protection to the steel substrate.

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Section: Resultsmentioning

confidence: 66%

“…Consequently, the increase in zinc dissolution causes its reaction with chloride ions in NaCl solution and formation of zinc hydroxy chloride, according to Eq. (5) [7,17].…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Borax Pentahydrate Addition to Acid Bath on the Microstructure and Corrosion Resistance of Zn-Co Coating

Karahan

2015

Acta Phys. Pol. A

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“…Various methods and techniques are reported with this respect [1][2][3][4][5][6][7][8][9][10]; including the utilization of environmentally friendly compounds [11][12][13]. Composite coatings incorporating micro-or nano-sized aggregates are a more recent approach [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Performance of Composite Galvanic Coatings with Variable Concentration of Polymeric Nanoaggregates and/or Cr(III) Conversion Layers

Koleva¹,

Taheri²,

Tsvetkova³

et al. 2011

ECS Trans.

Self Cite

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This paper reports on the corrosion performance of composite zinc layers (~ 8µm) on a steel substrate, considering the influence of nano-aggregates and Cr(III) conversion layers, compared to control (only Zn layers) conditions. The main factors, influencing the corrosion performance of Zn in this study are: a) the effect of two concentrations of polymeric nano-aggregates (0.1g/l and 0.3g/l PEO 113 -b-PS 218 core-shell micelles in the starting electrolyte); b) the effect of Cr(III) conversion layers on both pure Zn and composite Zn layers. For most of the hereby investigated time intervals i.e. treatment in aerated 5% NaCl from 2h until 120h, the composite coatings present higher corrosion resistance, especially within longer treatment. Corrosion current densities are similar to Zn, however, anodic currents are significantly lower. After treatment in NaCl, the composite Zn coatings present a more homogenous product layer, formed as a result of the presence of the nano-aggregates. The additional Cr(III) treatment does not significantly improve the corrosion resistance of the composite coatings for the hereby investigated time intervals.

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“…Protective effect is due to the formation of a passivation layer over the zinc surface and, on the other hand, to the galvanic sacrificial effect that zinc shows towards iron and its alloys [5]. Deposition of zinc alloys such as Zn-Ni, Zn-Co and Zn-Mn alloys have also found industrial applications for the improvement of anticorrosive properties of galvanic zinc layers on iron and its alloys [6][7][8][9][10][11][12][13]. Laboratory studies show that Zn-Mn alloys present better corrosion behaviour in saline environment than pure zinc layers [14,15].…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Zn-Mn alloys from recycling battery leach solutions in the presence of amines

Brito¹,

Patrício²,

Rodrigues³

et al. 2010

The Sustainable World

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The recovery of metal ions by electrodeposition from solutions resulting from the lixiviation of spent Zn-MnO 2 batteries was studied. It was attempted to optimise the electrodeposition process, the selectivity of ion-separation, the morphologic characteristics, and the anticorrosive and galvanic properties of metallic deposits. The simultaneous deposition of zinc and manganese on different ferrous substrates under various experimental conditions was tested. This allowed us to access the efficiency of the electrodeposition, the morphology and composition of the metallic deposits, as well as their performance as galvanic coating layers. The effect of amine additives, namely, of methylamine and ethylenediamine, on the properties of the coatings was also studied. It was shown that the amines with buffering or passivating effects improve the simultaneous deposition of Mn.

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Influence of the alloying component on the protective ability of some zinc galvanic coatings

Cited by 84 publications

References 9 publications

Effect of Borax Pentahydrate Addition to Acid Bath on the Microstructure and Corrosion Resistance of Zn-Co Coating

Effect of Borax Pentahydrate Addition to Acid Bath on the Microstructure and Corrosion Resistance of Zn-Co Coating

Corrosion Performance of Composite Galvanic Coatings with Variable Concentration of Polymeric Nanoaggregates and/or Cr(III) Conversion Layers

Electrodeposition of Zn-Mn alloys from recycling battery leach solutions in the presence of amines

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