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Effects of complexing agents on acidic electroless nickel deposition

Rare Metals 2010年第4期29卷 401-406页

作者： JIN Ying YU Hongying YANG Dejun SUN Dongbai National Center for Materials Service Safety University of Science and Technology Beijing Beijing 100083 China Corrosion andProteetion Center School of Materials Science andEngineering University of Science and Technology Beijing Beij'ing 100083 China

Our previous study reported the influences of different complexing agents on electroless nickel （EN） by examining the properties of the deposits. In the present work, the effects of four common-used complexing agents on EN deposition rate and the stability of solution pH values were examined, either with an acetic pH buffer agent or absent of them. It is indicated that the pH buffeting effect of them is dominative when the EN solution is lack of the pH buffer. Under this situation, the EN deposition rate increases with the concentration of complexing agents increasing. The EN deposition rate decreases with fin＇ther adding the complexing agent when the solution already has enough pH buffer capability. Electrochemical impedance spectroscopy obtained during EN deposition illustrates that, in this case, the enhanced reaction resistance is the main reason for a lower deposition rate. However, the influence of polarization caused by mass transfer is not negligible at high complex ratio for sodium citrate and malic acid EN solutions.

关键词： electroless nickel complexing agents electrochemical impedance spectrum reaction resistance pH value

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无氰镀银及电沉积行为研究(英文)

无氰镀银及电沉积行为研究(英文)

引用

2011年全国电子电镀及表面处理学术交流会

作者： Liu Anmin,An Maozhong~*,Yang Peixia,Zhang Jinqiu,Ren Xuefeng School of Chemical Engineering and Technology,Harbin Institute of Technology,Harbin,150001,China

＜正＞By comparative study on several non-cyanide silver electrodeposition baths,hydantoin was choosed as the main complexing agent in present non-cyanide silver electrodeposition *** optimizing auxiliary complexing agents,the optimized electrolyte composition was *** influence of bath composition and operation conditions on the qualities of silver coatings,cathodic current efficiency and limited current density were *** the optimized bath composition and plating conditions,the performance of hydantoin based on bath is equal to cyanide bath,the coatings obtained in optimized plating conditions possessed mirror bright,better anti-discoloration *** adhesion strength between the coated layer and the copper substrate was very *** surface morphologies were characterized by scanning electron microscope（SEM）.The results showed that the crystal size of metallic silver was small and the array of crystal was *** qualities of coatings obtained in optimized hydantoin based bath were equal to those obtained in cyanide bath. In order to improve the cathodic current density,the influence of additive was investigated,and the optimized additive was *** results showed that the presence of additive increased cathodic polarization,expanded current density range and improved the deposition rate of silver coatings.

关键词： non-cyanide silver electrodeposition complexing agents additive

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