Influence of copper, cadmium and tin additions in the galvanizing bath on the structure, thickness and cracking behaviour of the galvanized coatings

Katiforis, N.; Papadimitriou, G.

doi:10.1016/0257-8972(94)02408-1

Cited by 59 publications

(24 citation statements)

References 3 publications

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“…An unusually high concentration of Pb atoms was observed in certain regions which probably caused a preferred orientation inside the eta phase. Copper, which is known to favour the crystal growth of the δ-phase [2], exhibits a localized high concentration inside this phase. It is possible that copper atoms act as effective heterogeneous nucleation sites for the δ-phase.…”

Section: Resultsmentioning

confidence: 99%

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The effect of alloying elements on the crystallization behaviour and on the properties of galvanized coatings

Vourlias

Pistofidis

Stergioudis³

et al. 2004

Cryst. Res. Technol.

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The influence of the alloying elements on the interface reactions of zinc coatings during the galvanization process was examined. These reactions affect the crystallization and the structure and properties of the outer layer of the coatings. Depending on the type and concentration of the alloying additions in the galvanizing bath differences were induced in the crystallization process of the Fe-Zn phases. It was found that both the concentration and the distribution of the alloying elements played an important role in the growth of the phases. The formation of the phases and the distribution of the alloying elements in the coatings were determined using X-Ray diffraction (XRD) and Scanning Electron Microscopy (SEM) associated with an Energy Dispersive X-Ray Spectroscopy (EDS) analysis. Finally the behaviour of the galvanized coatings was examined under accelerated salt spray corrosion conditions.

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Section: Resultsmentioning

confidence: 99%

“…Additionally, the presence in the galvanizing bath of different alloying elements (such as Cu, Sn and Cd) at relatively high concentrations (of the order of 1-2 wt%) has been found to significantly affect both the appearance and the structure of the coatings [2,3,4,5].…”

Section: Introductionmentioning

confidence: 99%

The effect of alloying elements on the crystallization behaviour and on the properties of galvanized coatings

Vourlias

Pistofidis

Stergioudis³

et al. 2004

Cryst. Res. Technol.

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“…Molten zinc used in commercial galvanizing plants always contains some metallic impurities. In certain cases, additions are also intentionally made to influence the morphology and growth kinetics of zinc coating during the galvanizing process [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Microstructural study of galvanized coatings formed in pure as well as commercial grade zinc baths

Mandal

Das

et al. 2009

Trans Indian Inst Met

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This investigation is an effort to have a better understanding of the growth kinetics and morphology of the coating formed during the galvanizing process in pure as well as commercial grade zinc baths. The protective coating that is formed during hot dip galvanizing, normally between 450 and 480 o C, consists of a series of Fe-Zn intermetallic layers, which have been identified as gamma (Γ), delta (δ), zeta (ξ) and an outer eta (η) layer, highly rich in zinc. There is apparently no delay in the formation of ξ or δ phases in both pure as well as the commercial grade zinc baths. The gamma (Γ) phase is formed after an incubation time of about 30 s at a bath temperature of 470 o C in the pure zinc bath. Its formation is further delayed in the commercial grade zinc bath. The last morphological feature is the formation of a second ξ layer at the ξ/δ interface in the pure zinc bath. In the commercial grade zinc bath two different morphologies of ξ phase are seen starting from the lowest dipping time, and also the overall coating is considerably thicker due to formation of several iron-zinc intermetallics which degrade its ductility and outward appearance. Commercial grade zinc also enhances the dross formation in the bath and deteriorates the quality of the coating. Presence of transverse cracks as well as entrapment of dross particles in the coating is attributed to the less compact coating that is formed in the commercial grade zinc bath.

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“…The literature at present contains many reports about the effect of Al, Mg, Pb on Zn deposits, while, the reports about the influence of Sn on hot dip Zn coating is very limited [24] [25]. Sn and Sb have little effect on Fe-Zn alloy formation, but at high concentration, Sn and Sb promoted spangle formation.…”

Section: Introductionmentioning

confidence: 99%

Improvement the Corrosion Resistance for the Galvanized Steel by Adding Sn

Hamid¹,

Rehim²,

Shama³

et al. 2016

JSEMAT

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The chemical composition of the zinc bath can strongly influence on the hot-dip galvanized coatings. In this work, the effects of tin addition on the surface morphology, and the corrosion resistance of hot-dip galvanized steel were investigated. The corrosion behavior of steel samples galvanized with zinc and Zn-Sn alloys containing different wt% Sn was analyzed by various corrosion tests such as potentiodynamic polarization Tafel lines and electrochemical impedance spectroscopy (EIS) techniques. Salt spray test was employed in order to study the corrosion products of the specimens. Surface morphology, the composition of coating layers and nature of the corrosion products were also investigated using field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray analysis (EDX) and X-Ray diffraction (XRD) techniques, respectively. The results indicated that the addition of small amounts of Sn (0.1 wt%) to the molten zinc galvanizing bath can improve the corrosion resistance of hot-dip galvanized steel.

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Influence of copper, cadmium and tin additions in the galvanizing bath on the structure, thickness and cracking behaviour of the galvanized coatings

Cited by 59 publications

References 3 publications

The effect of alloying elements on the crystallization behaviour and on the properties of galvanized coatings

The effect of alloying elements on the crystallization behaviour and on the properties of galvanized coatings

Microstructural study of galvanized coatings formed in pure as well as commercial grade zinc baths

Improvement the Corrosion Resistance for the Galvanized Steel by Adding Sn

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