Synergistic effects of additives on morphology, texture and discharge mechanism of zinc during electrodeposition

Application of the general theory of disperse deposits formation in an investigation of mechanism of zinc electrodeposition from the alkaline electrolytes

“…3 substances, known as additives, to Zn electroplating baths [3,8,13,15,16,18,19], application of periodically changing regimes (pulsating overpotential, pulsating and reversing currents) of electrolysis [2, 23 -27], as well as a simultaneous application of both of them [5,25] can also achieve a strong effect on morphology of zinc deposits. The main purpose of the use of additives and application of periodically changing regimes of electrolysis is to obtain smooth and nanocrystalline deposits of better corrosion resistance [2,3,5,25], often bright coatings [28,29], or simply to suppress dendritic growth in alkaline Zn-air batteries [13,15,16].…”

Electrochemical Evaluation of Corrosion Resistance of Trivalent Chromate Conversion Coatings with Different Organic Additives

“…The relatively high Cr content in the trivalent chromate film of EZP3 could stem from the crystallographic texture of its galvanized layer, which facilitates zinc dissolution and chromate conversion. 12,29,32) EZP3, in particular, exhibited a high charge transfer resistance, which suggests a more protective and stable chromate film. 33) Consequently, EZP3 withstood a corrosion attack relatively well compared to all sets of the specimens throughout the six-week test period.…”

“…Adsorption of the additives also contributes to a reduction in the mean free path of the adions and influences the nucleation, grain growth, and texture development of the crystalline metals. 12,13,27) The three organic additives examined herein exhibit different levels of charge density in the order polyquaternary amine salt < imidazole and epihalohydrin < polyethyleneimine. 11) A higher charge density of additives results in stronger adsorption on the deposit, slowing down the growth of dendrites and modifying the crystallographic orientation.…”

“…Several studies have reported the effect of organic additives on the development of the microscopic features and structures of galvanized deposits, and subsequently on the plating characteristics and coating appearances. [11][12][13][14] Since the corrosion resistance of zinc coatings is known to relate their microstructures, [15][16][17] it could be anticipated that organic additives also play an important role in controlling the corrosion properties of galvanized deposits. Nevertheless, studies that aim to systematically verify and explain such relationships are currently limited.…”

Influence of bath temperature on zinc plating and passivation process

“…For instance, Mouanga et al, Nayana and Venkatesha and Gomes and Pereira have reported to prepare zinc thin films based on chloride zinc technology. [10][11][12] Technology parameters about zinc plating have been studied widely. Generally speaking, zinc plating was operated at room temperature (not up to 35uC).…”