Current oscillations observed during codeposition of copper and tin from sulfate solutions containing Laprol 2402C

• Published in: Electrochimica acta Vol. 43; no. 8; pp. 909 - 917
• Main Authors: Survila, Arvydas, Mockus, Zenius, Jušk≐nas, Remigijus
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.01.1998; Elsevier
• Subjects: Applied sciences; Chemistry; codeposition; copper; Electrochemistry; Electrodeposition; Exact sciences and technology; General and physical chemistry; Metallic coatings; Metals. Metallurgy; oscillations; Production techniques; Study of interfaces; Surface treatment; surface-active substance; tin; tin; copper; codeposition; surface-active substance; oscillations; Composition effect; Surfactant; Tin Alloys; Experimental study; Copper Alloys; Medium effect; Platinum; Oscillation; Microelectrode; Electrodeposition; Potassium Chlorides; Aqueous solution; Codeposition; Electrochemical reaction; Binary alloy; Electrical impedance
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/S0013-4686(97)00211-9

Current oscillations have been found during codeposition of copper and tin from sulfate solutions containing the surface-active substance (SAS) Laprol 2402C in the region of negative slope in the voltammogram. These phenomena are interpreted in terms of the transition from one stable state to another. The effective rate constant for the latter state was suggested to be significantly lower due to the inhibiting adsorption of SAS. The necessity of two conditions for oscillations to occur was confirmed, ie the existence of a negative faradaic impedance (ZF<0) and the fulfillment of the inequality Rs>∣ZF∣ (Rs is the external resistance including the ohmic cell resistance). The interplay between the oscillation phenomena and the phase constitution of the alloys deposited is discussed.