이온전지 및 전자기기용 Zn-Mg 합금의 내변색 특성에 미치는 Zr 기반 전해도금의 효과
Effect of Zr-Based Electroplating on the Discoloration Resistance of Zn-Mg Alloys for Ion Batteries and Electronic Devices
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This study examines the impact of Zr-based electroplating on the discoloration behavior of Zn-Mg alloy coatings, which are considered for use in aqueous ion-battery electrodes and electronic components. The as-coated Zn-Mg alloy on steel showed significant surface darkening after being exposed to boiling water, sim- ulating a high-temperature and high-humidity environment. To suppress this surface degradation, a Zr–O–Carbon- ate composite film was created through electroplating. In this process, Zr-Carbonate complexes were transformed into hydroxides and then dehydrated to produce a protective surface layer. The resulting film, approximately 500 nm thick, effectively reduced discoloration by limiting the formation of oxide species responsible for darkening. This was evidenced by significantly smaller decreases in lightness (L*) and a more stable surface morphology com- pared to uncoated samples, even after prolonged exposure. These findings indicate that Zr-based electroplating offers a straightforward and effective approach to enhance the environmental durability of Zn-Mg alloys, poten- tially expanding their use in energy and electronic device materials.
Abstract
This study examines the impact of Zr-based electroplating on the discoloration behavior of Zn-Mg alloy coatings, which are considered for use in aqueous ion-battery electrodes and electronic components. The as-coated Zn-Mg alloy on steel showed significant surface darkening after being exposed to boiling water, sim- ulating a high-temperature and high-humidity environment. To suppress this surface degradation, a Zr–O–Carbon- ate composite film was created through electroplating. In this process, Zr-Carbonate complexes were transformed into hydroxides and then dehydrated to produce a protective surface layer. The resulting film, approximately 500 nm thick, effectively reduced discoloration by limiting the formation of oxide species responsible for darkening. This was evidenced by significantly smaller decreases in lightness (L*) and a more stable surface morphology com- pared to uncoated samples, even after prolonged exposure. These findings indicate that Zr-based electroplating offers a straightforward and effective approach to enhance the environmental durability of Zn-Mg alloys, poten- tially expanding their use in energy and electronic device materials.