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
International Journal of Metalcasting – Springer Journals
Published: Jun 4, 2018
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