Corrosion behaviour of electrodeposited zinc-nickel alloys

Pushpavanam, Malathy; Natarajan, S.; Balakrishnan, K.; Sharma, Lalit

doi:10.1007/bf01024854

Cited by 72 publications

(33 citation statements)

References 3 publications

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“…The Zn deposit has the disadvantage of rapid dissolution [2,3], while Cd and Cr are highly toxic [3][4][5]. The ZnNi alloys provide good sacrificial protection when the Ni content in the deposit is in the range 10-15 wt% [6] or 15-18 wt% [3].…”

Section: Introductionmentioning

confidence: 99%

ZnNi alloy electrodeposition from acid baths containing sorbitol or glycerol and characterization of ZnNi deposits

2009

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The influence of sorbitol or glycerol on the electrodeposition of ZnNi alloys and on the morphology, composition and structure of the ZnNi deposits was investigated. The highest current efficiency (CE), around 90%, was obtained in the presence of glycerol in the potential range from approximately −1.30 V to −1.40 V, while in the presence of sorbitol or absence of either polyalcohol the CE was 82-85%, for the same potential range. Scanning electron microscopy (SEM) analysis showed that ZnNi deposition at −1.26 V or −1.40 V from a bath with sorbitol led to the formation of more compact deposits than with glycerol. Energy dispersive X-ray spectroscopy (EDS) analysis showed that the Ni content in the deposit obtained in the presence of sorbitol remained in the range of 7-9.5 wt% Ni, over a large range of deposition conditions. On the other hand, ZnNi deposits with variable Ni content (5.5-19.5 wt% Ni) were obtained from baths with glycerol or without either polyalcohol, by shifting the deposition potential. All ZnNi deposits showed uniform distribution of the elements Zn and Ni. X-ray analysis of ZnNi deposits obtained from plating baths with and without polyalcohol's at −1.26 and −1.40 V presented the γ, γ 1 and Pt 3 -Zn phases.

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Section: Introductionmentioning

confidence: 99%

ZnNi alloy electrodeposition from acid baths containing sorbitol or glycerol and characterization of ZnNi deposits

2009

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“…Usually the mechanical and chemical properties of metals are improved by alloying. The electrodeposition of Zn-Ni alloys is interesting, because these alloys exhibit a significant higher corrosion resistance and better surface morphology than pure zinc [4][5][6][7][8]. The aeronautical industry has shown increasing interest in Zn-Ni alloy coating as a substitute for toxic and high-cost cadmium coatings [9].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical studies of Zn–Ni alloy coatings from acid chloride bath

Basavanna

Naik

2009

J Appl Electrochem

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The electrodeposition of Zn-Ni alloy from chloride bath was carried out in presence of condensation product (CP) formed between vanillin and hexamine. The investigation of electrodeposition and nucleation process was carried out on glassy carbon electrode using cyclic voltammetric and chronoamperometric techniques. During the anodic scan of cyclic voltammetry, three anodic peaks were observed corresponding to the dissolution of zinc and nickel from different phases of Zn-Ni alloy. The model of Scharifker and Hills was used to analyze the current transients and it revealed that Zn-Ni electrocrystallization process in the presence of CP, under the studied conditions, is governed by three-dimensional nucleation process controlled by diffusion. In presence of CP, the results indicated that nucleation process changes from progressive to instantaneous when the deposition potential becomes more negative. The phase structure and surface morphology of the deposits were characterized by means of X-ray diffraction analysis and Scanning electron microscopy, respectively.

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“…An electroplating bath containing Platinum as H 2 Pt(NO 2 ) 2 (SO 4 ) complex prepared from P-salt has been reported and adopted commercially [12][13][14][15][16]. The advantages of the DNS bath are (i) capability to operate between 300 and 340 K (ii) low susceptibility to metallic contamination (iii) non-demanding nature for continuous stirring (iv) consistency (v) long life and (vi) stability.…”

Section: Introductionmentioning

confidence: 99%

High speed platinum deposition from a sulphamate formulation

Pushpavanam

2006

J Appl Electrochem

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A sulphamate based bath was identified as being suitable for high-speed platinum plating. The bath offers current efficiency approaching 70-80% and the deposits are bright in appearance. SEM examination showed that the grains are fine and XRD analysis indicates their grain size to be at the nano level. Cyclic voltammetric studies of the deposits indicate increased surface area. The properties of deposits obtained from sulphate and sulphamate formulations are compared.

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Corrosion behaviour of electrodeposited zinc-nickel alloys

Cited by 72 publications

References 3 publications

ZnNi alloy electrodeposition from acid baths containing sorbitol or glycerol and characterization of ZnNi deposits

ZnNi alloy electrodeposition from acid baths containing sorbitol or glycerol and characterization of ZnNi deposits

Electrochemical studies of Zn–Ni alloy coatings from acid chloride bath

High speed platinum deposition from a sulphamate formulation

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