(西南科技大學(xué) 四川省非金屬復(fù)合與功能材料重點實驗室?省部共建國家重點實驗室培育基地，綿陽 621010)
摘 要: 利用電化學(xué)技術(shù)研究有機添加劑存在的堿性環(huán)境下鉍的電沉積行為。結(jié)果表明：在循環(huán)伏安法試驗中，鉍的成核是一個擴散非可逆控制的電沉積過程，有機添加劑的存在使鉍的沉積電位明顯負(fù)移；在計時電流法試驗中，鉍的電沉積是一個典型三維連續(xù)成核過程。利用循環(huán)伏安法和計時電流法可以計算出非常接近的擴散系數(shù)，分別為1.17×10?5和1.55×10?5 cm2/s，說明這兩種方法可用于有機添加劑電沉積鉍的動力學(xué)計算研究。此外，氨基三亞甲基膦酸的加入細(xì)化了鍍層晶粒，使鍍層表面更加平整和致密。
關(guān)鍵字: 電沉積；鉍膜；成核；有機添加劑
（Southwest University of Science and Technology, State Key Laboratory Cultivation Base for
Nonmetal Composites and Functional Materials, Mianyang 621010, China）
Abstract:The electrodeposition of bismuth was studied by electrochemical techniques with the presence of the organic agents. The results show that, in the test for cyclic voltammetry, the electrodeposition of bismuth is a diffusion- irreversible-controlled process associated with a typical nucleation process. With simultaneously addition of amino tris(methylene phosphonic acid) organic agents in alkalinity solution, the redox potential of bismuth is shifted to more negative potentials. In this case, the current transients reveal an progressive nucleation with a typical three-dimensional (3D) growth mechanism. The diffusion coefficients are obtained, respectively, approximately 1.17×10?5 and 1.55×10?5 cm2/s from the cyclic voltammetry and the chronoamperometry. Under the experimental conditions of this work, both of the patterns can be used for describing the electrodeposition of bismuth with the presence of organic agents in alkalinity solutions. In addition, the addition of amino tris(methylene phosphonic acid) refines grains in coating and the surface of coating becomes more even and compact.
Key words: electrodeposition; bismuth-film; nucleation; organic agent
