On the Causes of the Formation of Rejected Silver Coatings

被引：0
|
作者：
Isaev, A. V. [1 ]
Isaev, V. V. [2 ]
Devyatkina, T. I. [1 ,2 ]
Ivashkin, E. G. [2 ]
Bachaev, A. A. [2 ]
机构：
[1] Russian Fed Nucl Ctr All Russian Sci Inst Expt Ph, Sedakov Res Inst Measuring Syst, Novgorod 603951NIZHN, Russia
[2] Nizhnii Novgorod State Tech Univ, Novgorod 603950NIZHN, Russia
来源：
RUSSIAN METALLURGY | 2023年 / 2023卷 / 13期
关键词：
silver coating; complex ions; decomposition of silver thiocyanate; reduction of insoluble salts;
D O I：
10.1134/S0036029523700131
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Free cyanide ions should be replaced by thiocyanate ions to decrease the toxicity of a cyanic silver-plating electrolyte. This allows the process to occur at high working current densities with the formation of a fine-grained deposit. This structure is shown to be formed due to the discharge of a mixed cyanide-thiocyanate complex. However, black or yellow spots causing article rejection form on the silver coating surface after washing and subsequent drying at elevated temperature. The spots are insoluble silver products, which further worsen the physicochemical characteristics of the coating. These spots can be removed by both chemical and electrochemical methods. The final elemental analysis of the coating composition after product removal shows no elements except for silver. The deposit structure has also been improved.
引用
收藏
页码：2077 / 2082
页数：6
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