Evaluation of Corrosion Resistance of Electrodeposited Chromium

Govindarajan, G. Thilagavathi; Ramakrishnan, Vijayalakshmi; Subramanian, Venu; Parthasaradhy, N.V.

doi:10.4028/www.scientific.net/kem.20-28.1285

Cited by 4 publications

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“…12,14 Concerning pure Mn plating, sulphur and selenium compounds are normally used as additives, in order to increase the current efficiency, but at the cost of contamination of the Mn deposit with sulphur and selenium inclusions. 15 The effect of various additives (e.g., gelatine, agar-agar, 16 ascorbic acid, alcohols, aromatic aldehydes and ketones, 17 thiourea and thiocarbamide 18 ) are well understood in Zn-Mn electrodeposition from a sulphate electrolyte. Contrarily, the list of additives studied in chloride electrolytes is appreciably shorter, including Fra 700 (a commercial additive for pure Zn), 8 poly-(ethylene glycol) 5 and ammonium thiocyanate.…”

Section: Introductionmentioning

confidence: 99%

The influence of substituted aromatic aldehydes on Zn-Mn alloy electrodeposition

Bučko¹,

Lačnjevac

Bajat³

2013

JSCS

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Additives are necessary in the electrodeposition of Zn-Mn alloys at high current densities, in order to reduce the hydrogen evolution reaction and prevent dendrite formation. The influences of two aromatic aldehydes, 4-hydroxy-benzaldehyde and 3,4-dimethoxy-benzaldehyde, as additives in the Zn-Mn plating electrolyte, were examined in this study. The characterization of the coatings by scanning electron microscopy and X-ray energy dispersive spectroscopy, as well as an examination of the effect of the additives by electrochemical methods, indicated a complex involvement of additive molecules in hydrogen evolution, as well as in Zn 2+ and Mn 2+ reduction. Consequently, a levelling action could be achieved and the chemical composition of the Zn-Mn alloy tailored by the addition of the proper type and concentration of additive in the plating electrolyte.

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Section: Introductionmentioning

confidence: 99%

The influence of substituted aromatic aldehydes on Zn-Mn alloy electrodeposition

Bučko¹,

Lačnjevac

Bajat³

2013

JSCS

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“…However, some investigators have examined the characteristics of Zn-Mn alloys and have found these to have markedly attractive features. [2][3][4][5][6][7][8][9] It has been reported that high Mn alloys ͑20-30% Mn͒ show the highest corrosion resistance known among zinc alloys, 10,11 but the deposition process has important drawbacks, particularly in regard to process control and current efficiency.…”

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confidence: 99%

Electrodeposition of Zn-Mn Alloys at Low Current Densities

Müller

Sarret

Andreu

2002

J. Electrochem. Soc.

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The electrodeposition of zinc-manganese alloys was studied at low current densities to design a process suitable for the automotive industry. Hull cell experiments were used to select the plating bath. The best results were obtained when both metals were in complexed forms Zn(II) with ethylenediaminetetraacetic acid and Mn(II) with citrate or malate. With these electrolytes the codeposition was achieved at low current densities, but current efficiencies were low. The characterization of the alloys obtained galvanostatically showed that most deposits were compact and showed different morphologies, mainly depending on the composition of the alloys and on the complexing agent for Mn(II). On the other hand, various phases of Zn-Mn alloys were identified in the coatings obtained under different experimental conditions. © 2002 The Electrochemical Society. All rights reserved.

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“…Various Zn-based alloys were considered, and for instance Zn-Ni, Zn-Co and Zn-Fe are currently used in industry. Several authors [1][2][3][4] have also investigated the Zn-Mn alloys. In a review article [5], Wilcox reports the results obtained by several corrosion studies, and concludes that the corrosion resistance in laboratory chloride environments is superior to zinc and other zinc alloys.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Zn–Mn alloys in acidic and alkaline baths. Influence of additives on the morphological and structural properties

et al. 2005

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Electrodeposition of Zn-Mn alloys on steel was achieved using alkaline pyrophosphate-based baths or acidic chloride-based baths. Cyclic voltammetry was used to determine the potential ranges where the various redox processes were taking place. It appeared that the reduction of Mn(II) was generally hidden by the other reduction reactions, especially by the hydrogen evolution reaction. Zn-Mn alloys containing up to 25 at.% Mn in the alkaline bath and 12 at.% in the acidic bath could be obtained at the cost of very low current efficiencies.The characterisation of the deposits obtained either by galvanostatic polarisation or potentiostatic polarisation was performed by Scanning Electron Microscopy and X-Ray Diffraction. Various Zn-Mn phases were obtained, depending on the current densities, the composition of the deposit and that of the electrolytic bath.Two commercial additives usually used for zinc electrodeposition, one in alkaline baths, the other in acidic baths, were tested. Their effects upon the composition, the morphology and the microstructure of the deposit were investigated.

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Evaluation of Corrosion Resistance of Electrodeposited Chromium

Cited by 4 publications

References 0 publications

The influence of substituted aromatic aldehydes on Zn-Mn alloy electrodeposition

The influence of substituted aromatic aldehydes on Zn-Mn alloy electrodeposition

Electrodeposition of Zn-Mn Alloys at Low Current Densities

Electrodeposition of Zn–Mn alloys in acidic and alkaline baths. Influence of additives on the morphological and structural properties

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