The Influence of Sodium Molybdate on the Properties of Zn-Ni Layers Obtained by Electrolytic Deposition

被引:3
作者
Wykpis, K. [1 ]
Budniok, A. [1 ]
Lagiewka, E. [1 ]
机构
[1] Univ Silesia, Inst Mat Sci, PL-40007 Katowice, Poland
来源
ADVANCED MATERIALS FORUM V, PT 1 AND 2 | 2010年 / 636-637卷
关键词
Electrodeposition of alloys; Zn-Ni-Mo layers; Corrosion resistance; ALLOYS; ELECTRODEPOSITION;
D O I
10.4028/www.scientific.net/MSF.636-637.1053
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This study was undertaken in the aim to try the limit of extraction of Zn from Zn-Ni system. The aim was realized by the addition of MoO(4)(2-) ions into the galvanic bath containing Ni(2+) and Zn(2+) ions. Zn-Ni-Mo layers were deposited under galvanostatic conditions on (OH18N9) austenitic steel substrate. The influence of Na(2)MoO(4) concentration in a bath on the surface morphology, chemical and phase composition and the corrosion resistance of obtained layers, was investigated. The properties of Zn-Ni-Mo layers were compared to the properties of electrolytic Zn-Ni layer. Structural investigations were performed by the X-ray diffraction (XRD) method. The surface morphology and chemical composition and surface chemical elements distribution of deposited layers were studied using a scanning electron microscope. Electrochemical corrosion resistance investigations were done by classical Stern method and electrochemical impedance spectroscopy. The potentiodynamic curves in the range of +/- 0.05V to the potential of open circuit, were obtained. On the base of these curves the parameters like corrosion potential-E(cor), corrosion current density-i(cor) and the polarization resistance-R(p) were determined. These values served as a measure of the corrosion resistance of obtained layers. Results of impedance investigations were presented on the Nyquist Z"=f (Z') and the Bode log |Z| = f (log omega) and phi = f (log omega), diagrams. On the basis on this research, it was exhibited that surface morphology, chemical composition of Zn-Ni-Mo layers are dependent on Mo contents. The optimal content of Na(2)MoO(4) in the bath for the sake of corrosion resistance in 5% NaCl, is found to be 1.2 g.dm(-3).
引用
收藏
页码:1053 / 1058
页数:6
相关论文
共 6 条
[1]   Dependence of coating characteristics on deposition potential for electrodeposited Zn-Ni alloys [J].
Elkhatabi, F ;
Benballa, M ;
Sarret, M ;
Müller, C .
ELECTROCHIMICA ACTA, 1999, 44 (10) :1645-1653
[2]   Development of Zn-Ni-Cd coatings by pulse electrodeposition process [J].
Ganesan, Prabhu ;
Kumaraguru, Swaminatha P. ;
Popov, Branko N. .
SURFACE & COATINGS TECHNOLOGY, 2006, 201 (06) :3658-3669
[3]   Obtention and characterisation of cobalt plus copper electrodeposits from a citrate bath [J].
Gómez, E ;
Llorente, A ;
Vallés, E .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2000, 495 (01) :19-26
[4]   Application of Vegard's law to mixed cation sodalites: a simple method for determining the stoichiometry [J].
Lambregts, MJ ;
Frank, S .
TALANTA, 2004, 62 (03) :627-630
[5]   On the effective lattice parameter of binary alloys [J].
Lubarda, VA .
MECHANICS OF MATERIALS, 2003, 35 (1-2) :53-68
[6]   Electrodeposition of Zn-Ni alloys in sulfate electrolytes [J].
Miranda, FJF ;
Barcia, OE ;
Diaz, SL ;
Mattos, OR ;
Wiart, R .
ELECTROCHIMICA ACTA, 1996, 41 (7-8) :1041-1049