Influence of the bath composition and the pH on the induced cobalt-molybdenum electrodeposition

被引:83
作者
Gómez, E [1 ]
Pellicer, E [1 ]
Vallés, E [1 ]
机构
[1] Univ Barcelona, Fac Quim, Dept Quim Fis, Lab Electrodeposicio & Corrosio Electrodep, E-08028 Barcelona, Spain
来源
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2003年 / 556卷
关键词
cobalt-molybdenum; magnetic alloy; induced codeposition mechanism; electrodeposition;
D O I
10.1016/S0022-0728(03)00339-5
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Experimental electrodeposition parameters (pH, cobalt(II), citrate and molybdate concentrations) were varied in order to analyse their influence on induced cobalt-molybdenum codeposition. Voltammetry was the main technique used. In Co-Mo electrodeposition an initial molybdenum oxide layer is formed, over which the alloy is deposited. The process depends on the nature of the species in solution. At quasi-neutral pH, CoCit(-) is the main Co(II) species when there is sufficient complexing agent. Thus, cobalt is deposited as a result of the reduction of CoCit(-), and molybdenum is reduced from MoO42- to MoO2. This intermediate oxide evolves to molybdenum via the formation Of [MoO2-CoCit(-)](ads). In acidic media, molybdate complexes with citrate, so molybdenum oxides are formed from H(r)MoO(4)Cit([5-r]). On the other hand, cobalt is deposited mainly by CoHCit reduction. CoCit(-)/CoHCit and molybdenum oxides are reduced simultaneously, so cobalt nuclei are always needed to induce the codeposition. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:137 / 145
页数:9
相关论文
共 17 条
[1]  
Brenner A., 1963, ELECTRODEPOSITION AL, V1
[2]  
BUSCHOW KHJ, 2001, ENCY MAT SCI TECHNOL, V2
[3]  
CHASSAING E, 1995, J APPL ELECTROCHEM, V25, P667, DOI 10.1007/BF00241928
[4]   MECHANISM OF NICKEL MOLYBDENUM ALLOY ELECTRODEPOSITION IN CITRATE ELECTROLYTES [J].
CHASSAING, E ;
QUANG, KV ;
WIART, R .
JOURNAL OF APPLIED ELECTROCHEMISTRY, 1989, 19 (06) :839-843
[5]  
CHERKAOUI M, 1987, PLAT SURF FINISH, V74, P50
[6]   INFLUENCE OF SUBSTRATE ON THE ELECTRODEPOSITION OF NICKEL-MOLYBDENUM ALLOYS [J].
CROUSIER, J ;
EYRAUD, M ;
CROUSIER, JP ;
ROMAN, JM .
JOURNAL OF APPLIED ELECTROCHEMISTRY, 1992, 22 (08) :749-755
[7]   MOLYBDENUM(VI) COMPLEX-FORMATION .8. EQUILIBRIA AND THERMODYNAMIC QUANTITIES FOR THE REACTIONS WITH CITRATE [J].
CRUYWAGEN, JJ ;
ROHWER, EA ;
WESSELS, GFS .
POLYHEDRON, 1995, 14 (23-24) :3481-3493
[8]   Electrodeposited cobalt-molybdenum magnetic materials [J].
Gómez, E ;
Pellicer, E ;
Vallés, E .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2001, 517 (1-2) :109-116
[9]  
GOMEZ E, 2003, IN PRESS J APPL ELEC
[10]   Determination of Mo(VI) species and composition in Ni-Mo alloy elating baths by Raman spectra factor analysis [J].
Murase, K ;
Ando, H ;
Matsubara, E ;
Hirato, T ;
Awakura, Y .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2000, 147 (06) :2210-2217