表面技術
Online ISSN : 1884-3409
Print ISSN : 0915-1869
ISSN-L : 0915-1869
銀めっき皮膜の室温放置による再結晶化
若林 信一岩野 恵子中沢 昌夫小沼 良雄金子 紀男
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2000 年 51 巻 10 号 p. 1021-1025

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The recrystallization behavior of silver electrodeposits obtained from a low-cyanide silver plating solution containing selenocyanate as an additive was studied using XRD and SIM measurements.
For bright deposits obtained at 120A/dm2, the as plated deposits consisted of randomly oriented small crystallites with very weak XRD patterns, deposits hardness was ca. Hv 100. Several hours after plating, the crystallites of the deposits kept at room temperature grew into large crystallites that were predominantly parallel to the substrates. The peak height of the (200) plane of the deposits increased dramatically. Accordingly, the hardness of the deposits decreased drastically to ca. Hv 50.
In contrast, matt silver deposits obtained at 40A/dm2 produced no recrystallization phenomena at room temperature after plating. The difference between the deposits coincides with the amount of codeposited selenium in the deposits. Bright deposits containg lower levels of selenium than matt deposits. recrystallized easily compared with matt deposits.

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