Change of the Decorative Properties of Zinc-Plated Zinc Die Castings over Time

Change of the Decorative Properties of Zinc-Plated Zinc Die Castings over Time Zinc alloy die casting is often chosen for the manufacturing aluminum from the substrate diffuses through the coating, of various consumer goods, since this process allows with the different diffusion rates for the coatings that were manufacturing of parts with a consistent quality and a high deposited from the different electrolyte types. Thus, alka- cost efficiency. With regard to recycling, using zinc elec- line zinc showed higher rates of aluminum diffusion com- trodeposition as a surface treatment for zinc die cast offers pared to acid zinc. It was speculated that aluminum clear advantages. However, it is often noticed that bright diffusion through the coating followed by oxidation under zinc-plated coatings on zinc die cast components change the influence of ambient moisture and contaminants trig- color over time, developing distinct blue spots on the sur- gers the observed blue discoloration. face. In the present study, zinc-plated zinc die cast com- ponents were aged and characterized via Energy- Keywords: electroplating, zinc die cast, zinc plating, Dispersive X-ray Spectroscopy, X-ray diffraction, and color change, decorative surface finishing gloss and color analyses to make a conclusion on the mechanism of tarnishing. It was found that over time Introduction its good castability and dimensional http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Metalcasting Springer Journals

Change of the Decorative Properties of Zinc-Plated Zinc Die Castings over Time

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Publisher
Springer International Publishing
Copyright
Copyright © 2018 by American Foundry Society
Subject
Materials Science; Metallic Materials; Characterization and Evaluation of Materials; Structural Materials
ISSN
1939-5981
eISSN
2163-3193
D.O.I.
10.1007/s40962-018-0237-0
Publisher site
See Article on Publisher Site

Abstract

Zinc alloy die casting is often chosen for the manufacturing aluminum from the substrate diffuses through the coating, of various consumer goods, since this process allows with the different diffusion rates for the coatings that were manufacturing of parts with a consistent quality and a high deposited from the different electrolyte types. Thus, alka- cost efficiency. With regard to recycling, using zinc elec- line zinc showed higher rates of aluminum diffusion com- trodeposition as a surface treatment for zinc die cast offers pared to acid zinc. It was speculated that aluminum clear advantages. However, it is often noticed that bright diffusion through the coating followed by oxidation under zinc-plated coatings on zinc die cast components change the influence of ambient moisture and contaminants trig- color over time, developing distinct blue spots on the sur- gers the observed blue discoloration. face. In the present study, zinc-plated zinc die cast com- ponents were aged and characterized via Energy- Keywords: electroplating, zinc die cast, zinc plating, Dispersive X-ray Spectroscopy, X-ray diffraction, and color change, decorative surface finishing gloss and color analyses to make a conclusion on the mechanism of tarnishing. It was found that over time Introduction its good castability and dimensional

Journal

International Journal of MetalcastingSpringer Journals

Published: Jun 4, 2018

References

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