ELECTRODEPOSITION OF SILVER FROM NITRATE-TARTRATE SOLUTIONS
DOI:
https://doi.org/10.7494/mafe.2018.44.2.81Keywords:
electrolysis, morphology, nitrate, silver, tartrateAbstract
The electrodeposition of silver from AgNO3 solutions with the addition of L-tartaric acid was investigated. The cathodic reaction was accompanied by low electrode polarization and run under activation control for AgNO3 concentrations of above 70 mM. Tartaric acid only slightly shifted the polarization curves towards more electronegative potentials (by approx. 50 mV), but it did not change the rate-determining step. The activation control of the process resulted in the formation of rough and coherent deposits, while the mixed or diffusion control of the process promoted the formation of dendritic-like structures and spongy deposits.
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Fischer H.: Elektrolytische Abscheidung und Elektrokristallisation von Metallen. Springer, Berlin – Göttingen – Heidelberg 1954
Winand R., Ham P.V., Colin R., Milojević D.: An attempt to quantify electrodeposit metallographic growth structures. Journal of the Electrochemical Society, 144, 2 (1997), 428–436
Winand R.: Electrocrystallization – theory and applications. Hydrometallurgy, 92, 1–3 (1992), 567–598
Popov K.I., Krstajić N.V., Jerotijević Z.D., Marinković S.R.: Electrocrystallization of silver from silver nitrate solutions at low overpotentials. Surface Technology, 26 (1985), 185–188
Popov K.I., Živković P.M., Nikolić N.D.: Formation of disperse silver deposits by the electrodeposition processes at high overpotentials. International Journal of Electrochemical Science, 7 (2012), 686–696
Mishina K., Okabe T.H., Umetsu Y.: Electrodeposition of silver from nitrate solutions. Shigen-to-Sozai, 117 (2001), 753–758
Vereecken J., Winand R.: Influence of nitrate ions on silver electrocrystallization. Electrochimica Acta, 22 (1977), 401–409
Rudnik E.: Wpływ stężenia jonów srebra Ag+ i gęstości prądu na morfologię osadów katodowych srebra otrzymywanych z roztworu azotanowego. Rudy i Metale Nieżelazne, Recykling, 63, 8 (2018), 3–8
Vereecken J., Winand R.: Influence of inhibitors on the structure of silver deposits obtained by electrolysis of aqueous nitrate solutions. Journal of the Electrochemical Society, 123 (1976), 643–646
Klapka V.: Nucleation of silver on platinum electrode under galvanostatic conditions. Collection of Czechoslovac Chemisty Communications, 36 (1971), 1181–1182
Pangarov N.A., Velinov V.: The orientation of silver nuclei on a platinum substrate. Electrochimica Acta, 11 (1966), 1753–1758
Rudnik E., Burzyńska L.: Influence of organic additives on morphology and purity of cathodic silver. Archives of Metallurgy and Materials, 50, 1 (2006), 137–144
Oniciu L., Muresan L.: Some fundamental aspects of levelling and brightening in metal electrodeposition. Journal of Applied Electrochemistry, 21 (1991), 565–574
Ashiru O.A.: Gelatin inhibition of a silver plating process. Plating and Surface Finishing, 82, 4 (1995), 76–82
Popov K.I., Pavlovic M.G., Grgur B.N., Dimitrov A.T., Hadzi Jordanov S.: Electrodeposition of silver from nitrate solution: Part II. Mechanism of the effect of phosphate ions. Journal of Applied Electrochemisty, 28 (1998), 797–801
Papanastasiou G., Jannakoudakis D., Amblard J., Froment M.: Influence of tartaric acid on the electrodeposition of silver from aqueous AgNO3 solutions. Journal of Applied Electrochemistry, 15 (1985), 71–76
Zarkadas G.M., Stergiou A., Papanastasiou G.: Influence of tartaric acid on the electrocrystallization of silver from binary water + dioxane AgNO3 solutions. Journal of Applied Electrochemistry, 31 (2001), 1251–1259
The UPAC stability constants database, Academic Software and IUMAC, 1992–2000