Studies on the Inhibition and Catalysis Effects of Tetren in Zinc Electrodeposition

Abstract

Abstract: The inhibition and catalysis effects of tetren on discharge of Zn(OH)₄^2- in alkaline zincate bath have been studied by means of voltammetry and differential capacity measurement.The results show that tetren has a higher adsorptivity on Hg-electrode/solution interface.The adsorption quantity is increased and the potential range of adsorption is extended toward more negative potential with increasing of tetren concentration.It is found that tetren inhibits the discharge of Zn(OH)₄^2- at potentialbetween -1.3——1.45 V.At the potential more negative than - 1.45 V, two catalytic currentpeaks are observed on voltammetric curves, and they are merged into a peak as the concentration of tetren increased.As tetren concentration is higher than₅× 10^-3 mol/L, the peak current is directly proportional to the concentration of tetren and ZnOboth, but inversely proportional to NaOHconcentration.The relevant empirical formula are given in this paper, and the catalysis effect of tetren on Zn(OH)₄^2- dischage is discussed by homogeneous parallel reaction and the ion pairing effect.

Key words: Electrodeposition, Tetren, Adsorption, Inhibition, Catalysis

TrendMD:

CAI Jia-Le, ZHOU Shao-Min . Studies on the Inhibition and Catalysis Effects of Tetren in Zinc Electrodeposition[J]. Chem. J. Chinese Universities, 1993, 14(3): 388.

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Studies on the Inhibition and Catalysis Effects of Tetren in Zinc Electrodeposition

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