Role of additives in bright zinc deposition from cyanide free alkaline baths

Abstract

A new additive formulation for non-cyanide alkaline zinc baths was identified after experiments with various additives. Polyvinyl alcohol addition was found to be the best primary additive of those tested. The secondary additives selected belonged to the aldehyde group. The selection of the additives was made based on Hull cell, cathode current efficiency and throwing power studies. Thickness measurements at various points on a cathode indicated uniform thickness distribution. XRF showed uniform deposition. SEM examination indicated a finegrained deposit structure. Finally, the influence of each additive was studied using cyclic voltammetry.

Synergistic effect of additives on bright nanocrystalline zinc electrodeposition

“…On an industrial scale the zinc electrodeposition is obtained from alkaline cyanide baths. But due to high toxic nature of cyanide baths, other baths like sulfate, chloride and sulphamate are gaining importance even though they have poor throwing power [1][2][3][4][5][6]. The primary goal of all these baths is to generate quality zinc deposit with good corrosion protection ability to steel.…”

Quality Reinforcement of Electroplating Zinc Coatingselectrodeposited From Cyanide Free Alkaline Solution by Polyamine 70.000 and Polyvinyl Alcohol 16.000

“…The steel plates were subjected to water wash and given bright dip in 1 % nitric acid for 3s prior to the electroplating process. The nature and appearance of zinc plating was carefully studied and recorded [10]. The cathodic polarization measurements were carried out at the scan rate of 2 mV/s using Autolab PGSTAT 30 connected with threeelectrode cell in which silver/silver chloride and platinum sheet of 1.5 cm 2 were used as reference and counter electrodes, respectively, and steel electrode with area of 0.785 cm 2 was used as working electrode.…”

Template‐Free Electrodeposition of Zinc Nanowires from an Ionic Liquid

“…[1][2][3] Furthermore, they are used, for example, in zinc/airb atteries. [4][5][6] Zinc can be depositedf rom aqueous electrolytes [7][8][9][10] with low current efficiencies, owing to hydrogen evolution. [11,12] Dimethylsulfone, an onaqueous solvent, was used to study the physical properties of ZnCl 2 , [13] and the electrodeposition of zinc from this electrolyte at temperatures between 60 and 80 8Ch as been reported.…”