A MICRO-MORPHOLOGICAL STUDY OF THE DISSOLUTION OF SILVER-GOLD ALLOYS IN NITRIC-ACID
A MICRO-MORPHOLOGICAL STUDY OF THE DISSOLUTION OF SILVER-GOLD ALLOYS IN NITRIC-ACID
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DOI：
10.1080/01418618008239360
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发表时间：
1980-01-01
期刊：
影响因子：
--
通讯作者：
DURKIN, P
中科院分区：
文献类型：
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作者：
FORTY, AJ;DURKIN, P
银-金合金薄膜的表面结构和成分的显微观察被用来推断这些合金在硝酸溶液中的溶解过程。微观形态由岛和通道结构组成，其形成详细取决于合金的初始整体组成。微形态可以通过在高温下短时间退火、在室温下长时间储存或在腐蚀期间增加酸的强度来改变，得到非常相似的结果。这些观察结果可以解释在一个模型中，腐蚀的进行选择性溶解的不太贵的成分，从而创建一个无序的表面层，随后重新排序的表面扩散。
Microscopic observations of the surface structure and composition of thin films of silver-gold alloys are used to deduce the processes involved in the dissolution of these alloys in nitric acid solutions. The micromorphology consists of an island-and-channel structure whose formation depends in detail on the initial overall composition of the alloy. The micromorphology can be modified by annealing for short times at elevated temperature, by storage for long periods at room temperature, or by increasing the strength of the acid during corrosion, giving very similar results. These observations can be explained in terms of a model in which corrosion proceeds by selective dissolution of the less noble component, thereby creating a disordered surface layer which subsequently reorders by surface diffusion.