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Korean Journal of Metals and Materials > Volume 54(9); 2016 > Article
Korean Journal of Metals and Materials 2016;54(9): 652-658. doi: https://doi.org/10.3365/KJMM.2016.54.9.652
금도금의 전류효율에 미치는 과황산칼륨 첨가의 영향
손인준1, 손호상1, 김경태2
1경북대학교 금속신소재공학과
2재료연구소 분말기술연구실
Effect of Potassium Persulfate on Current Efficiency for Gold Plating
Injoon Son1, Ho-Sang Sohn1, Kyung Tae Kim2
1Department of Materials Science and Metallurgical Engineering Kyungpook National University, Daegu 41566, Republic of Korea
2Powder & Ceramic Materials Division, Korea Institute of Materials Science, Gyeongnam 51508, Republic of Korea
Correspondence  Injoon Son ,Tel: +82-53-950-5563, Email: ijson@knu.ac.kr
Received: 18 November 2015;  Accepted: 5 April 2016.  Published online: 5 September 2016.
In this study, the effect of potassium persulfate on current efficiency for gold plating was investigated using electrochemical techniques. The current efficiency in the low-current-density range greatly decreased when potassium persulfate was added to the gold plating solution. However, the current efficiency in the high-current-density range did not change with the addition of potassium persulfate. The measured contact resistances of the resulting gold-plated layers showed almost similar values, regardless of the addition of potassium persulfate, suggesting that potassium persulfate does not affect the property of the gold layers. Linear sweep voltammetry and partial polarization curves showed that the persulfate ion was reduced when the noble potential was more than that of the gold ion. Therefore, the current efficiency for gold plating decreased when potassium persulfate was added in the low-current-density range because at such a current-density the reduction of persulfate preferentially occurs.
Keywords: electroplating, gold plating, current efficiency, potassium persulfate, connector
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