Corrosion Behaviour of Zn Coatings Electrodeposited from Alkaline and Acid Solutions

Narkevičius, Algirdas; Bučinskienė, Dalia; Samulevičienė, Meilutė; Ramanauskas, R.

doi:10.1080/00202967.2003.11871506

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…Specifically, pyrophosphate deposition bath is an environmentally friendly electrolyte [37], and metals/alloys obtained in this electrolyte do not produce their oxide/hydroxide forms [38][39][40][41]. As pyrophosphate bath is alkaline (pH > 9), and the corrosion resistivity of zinc coating deposited from alkaline electrolyte is increased, pyrophosphate bath was selected to coat the magnesium-based alloy in this study [42]. The aim of this study was to investigate the structural behaviour and corrosion resistivity of a magnesium-based alloy (AZ63) and Zn-Cu coated AZ63.…”

Section: Introductionmentioning

confidence: 99%

Structural and Corrosion Study of Uncoated and Zn-Cu Coated Magnesium-Based Alloy

Hacıibrahimoğlu

Bedır

Yavuz

2016

Metals

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Zn-Cu alloy was deposited onto AZ63 substrate, and the corrosion behaviour of resulting modified electrodes was investigated in 3 wt % NaCl solution in comparison with uncoated AZ63. Electrochemical, structural, and morphological study of the coating is presented. SEM images reveal that the surface morphology of the films is uniformly small spherical grain distributions. The XRD patterns illustrate polycrystalline structure and the formation of peaks corresponding to hexagonal close-packed ε-phase of Zn-Cu with various crystallographic orientations. Cyclic voltammetry was used to determine the potential ranges where the various redox processes occur. Linear sweep voltammetry results illustrate that longer exposure of uncoated AZ63 in NaCl solution produces a greater corrosion potential shift because of the formation of an oxide layer that did not prevent the progression of corrosion attack. The corrosion resistivity of Zn-Cu coated AZ63 is approximately two orders of magnitude greater than that of uncoated AZ63.

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Section: Introductionmentioning

confidence: 99%

Structural and Corrosion Study of Uncoated and Zn-Cu Coated Magnesium-Based Alloy

Hacıibrahimoğlu

Bedır

Yavuz

2016

Metals

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“…An active fungi growth is observed in municipal utilities, various tunnels, underground crossings, collectors, wooden, stone, metallic and multicomponental buildings and equipment, railroads and other means of transport (Hughes, Poole 1989;Roberge 1998;Marcus, Oudar 2002). The activity of microorganisms depends on their biological variety in the environment, their action specificity and ability to adapt to extreme natural environment, as well as on the composition of the unusual substrates which are formed by contamination with microorganisms and coupled with the surrounding medium (Ramanauskas et al 1998(Ramanauskas et al , 2000(Ramanauskas et al , 2005Narkevičius et al 2003). Technical objects are deteriorated by bacteria, mitosporic fungi and other biota as well as their communities.…”

Section: Influence Of Mitosporic Fungi Upon Zinc-polymeric Coatings Omentioning

confidence: 97%

Influence of mitosporic fungi upon zinc-polymeric coatings on steel under the different environment

Lugauskas

Prosyčevas

Narkevičius

et al. 2013

Journal of Environmental Engineering and Landscape Management

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Zinc-polymeric coating samples were exposed to different environmental conditions (for 2 years): marine Á dunes on the shore of the Baltic Sea (Neringa), rural-agrarian district of Moletai and the industrial zone of Vilnius. During the whole period of the study 94 species of fungi, were isolated from the exposed samples of zinc-polymeric coating on steel. The zinc-polymeric coatings exposed to marine and rural-agrarian environments were deteriorated most markedly. A scanning electron microscope (SEM) was used to characterize the morphology of the surface. The phase composition of the zinc-polymeric coatings on the steel substrate was analysed by an X-ray diffractometer (XRD). The products formed on the zinc-polymeric coatings were detected by a Fourier transformation infrared spectrometer (FTIR). The effect of environmental conditions on the mass change of the samples was determined by the standard dissolution method. Reference to this paper should be made as follows: Lugauskas, A.; Prosyčevas, I.; Narkevičius, A.; Selskienė, A.; Bučinskienė, D.; Ručinskienė, A.; Binkauskienė, E. 2013. Influence of mitosporic fungi upon zinc-polymeric coatings on steel under the different environment, Journal of Environmental Engineering and Landscape Management 21(3): 199Á208. http://dx.

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“…Tek pre nekoliko godina utvrđeno je da se taloženje može uspešno izvoditi iz rastvora čije su pH vrednosti iznad 9, gde ulogu osnovnog elektrolita i kompleksirajućeg agensa čini kalijum-pirofosfat [6]. Poznato je da alkalni rastvori za taloženje prevlaka Zn imaju niz prednosti u odnosu na kisele, od kojih su najvažnije dobra raspodela struje na katodi i povećana koroziona stabilnost prevlake [7]. U prethodnim radovima [8,9] ispitivane su osobine prevlaka Zn−Mn legura taloženih iz tri različite vrste rastvora, gde su ulogu osnovnog elektrolita imale hloridna, sulfatna i pirofosfatna so.…”

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The peculiarities of electrochemical deposition and morphology of ZnMn alloy coatings obtained from pyrophosphate electrolyte

Bučko¹,

Stevanović²,

Tomić

et al. 2011

Hem Ind

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The first successful attempt to electrodeposit ZnMn alloy coatings from alkaline bath was made only a few years ago. In this kind of solution, potassium pyrophosphate (K4P2O7) serves both as a complexing agent and as the basic electrolyte. The aim of this work was to study the electrodeposition process and properties of ZnMn alloy coatings deposited from pyrophosphate solution, with a new kind of alkaline pyrophosphate bath. Namely, chloride salts were used as the source of metal ions and ascorbic acid was used as reducing agent. The composition of the plating solution was as follows: 1 mol dm-3 K4P2O7 + 0.017 mol dm-3 ascorbic acid + 0.05 mol dm-3 ZnCl2 + 0.05 mol dm-3 MnCl2•4H2O. Cathodic processes during the alloy electrodeposition were investigated using linear voltammetry. The influence of addition of small amounts of ascorbic acid on the cathodic processes was established. It was shown that this substance inhibits hydrogen evolution and increases the current efficiency of alloy deposition. The current efficiency in the plating bath examined was in the range of 25 and 30%, which was quite higher as compared to the results reported in the literature for electrodeposition of ZnMn alloy from pyrophosphate bath. Electrodeposition of ZnMn alloys was performed galvanostatically on steel panels, at current densities of 20120 mA cm-2. The coatings with the best appearance were obtained at current densities between 30 and 80 mA cm-2. The surface morphology studies, based on atomic force microscopy measurements, showed that morphology of the deposits is highly influenced by deposition current density. ZnMn coating deposited at 30 mA cm-2 was more compact and possessed more homogeneous structure (more uniform agglomeration size) than the coating deposited at 80 mA cm-2. Such dependence of morphology on the current density could be explained by the high rate of hydrogen evolution reaction during the electrodeposition process

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Corrosion Behaviour of Zn Coatings Electrodeposited from Alkaline and Acid Solutions

Cited by 8 publications

References 13 publications

Structural and Corrosion Study of Uncoated and Zn-Cu Coated Magnesium-Based Alloy

Structural and Corrosion Study of Uncoated and Zn-Cu Coated Magnesium-Based Alloy

Influence of mitosporic fungi upon zinc-polymeric coatings on steel under the different environment

The peculiarities of electrochemical deposition and morphology of ZnMn alloy coatings obtained from pyrophosphate electrolyte

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