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

 
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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 (EN)

Papadimitriou, G (EN)
Katiforis, N (EN)

N/A (EN)

The influence of copper, cadmium and tin additions in the galvanizing bath on the morphology and thickness of galvanized coatings has been studied using X-ray diffraction and optical and scanning electron microscopy associated with energy-dispersive spectroscopy microanalysis. Copper promotes the delta(1) phase and hinders the zeta phase growth. In the opposite, cadmium promotes the zeta and Gamma phase formation and hinders the growth of the delta(1) phase. No change in the morphology of galvanized coatings has been observed with the addition of tin. Mechanisms have been proposed in order to explain the effect of the above elements on the formation of intermetallics. The cracking of the coatings after tensile testing in the plastic region of the specimens has been examined. The delta(1) phase is responsible for the nucleation and propagation of transverse cracks parallel to the steel substrate. Cadmium hinders the nucleation and propagation of the transverse cracks during loading up to the yield point of the steel; however, the columnar growth of the zeta phase results in the complete flaking of the coating during loading up to the ultimate tensile strength of steel. The Gamma phase remains always adhered to the steel substrate. (EN)

journalArticle

Cadmium alloys (EN)
Scanning electron microscopy (EN)
Structure (composition) (EN)
Galvanizing bath (EN)
Coatings (EN)
Energy dispersive spectroscopy microanalysis (EN)
Composition effects (EN)
Phase transitions (EN)
X ray diffraction (EN)
Crack propagation (EN)
Tin alloys (EN)
Galvanized coatings (EN)
Optical microscopy (EN)
Cracking behaviour (EN)
Copper alloys (EN)
Morphology (EN)
Hot-dip galvanizing (EN)
Structure (EN)
Galvanizing (EN)
Protective coatings (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Surface and Coatings Technology (EN)

1996


ELSEVIER SCIENCE SA LAUSANNE (EN)



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