Electrochemical studies of Zn–Ni alloy coatings from acid chloride bath

Abstract

The electrodeposition of Zn-Ni alloy from chloride bath was carried out in presence of condensation product (CP) formed between vanillin and hexamine. The investigation of electrodeposition and nucleation process was carried out on glassy carbon electrode using cyclic voltammetric and chronoamperometric techniques. During the anodic scan of cyclic voltammetry, three anodic peaks were observed corresponding to the dissolution of zinc and nickel from different phases of Zn-Ni alloy. The model of Scharifker and Hills was used to analyze the current transients and it revealed that Zn-Ni electrocrystallization process in the presence of CP, under the studied conditions, is governed by three-dimensional nucleation process controlled by diffusion. In presence of CP, the results indicated that nucleation process changes from progressive to instantaneous when the deposition potential becomes more negative. The phase structure and surface morphology of the deposits were characterized by means of X-ray diffraction analysis and Scanning electron microscopy, respectively.

Electrochemical studies of sol-enhanced Zn–Ni–Al2O3 composite and Zn–Ni alloy coatings

“…Basavana et al [24,25] investigated the electrodeposition and nucleation process of Zn-Ni alloys from chloride and sulfate baths in the presence and absence of some brighteners such as the condensation products of vanillin, serine and hexamine. Their results showed that the Zn-Ni electro-crystallization process was governed by the deposition potential and type of brighteners.…”

Study of the effect of new brightener on Zn–Ni alloy electrodeposition from acid sulphate bath

“…7 and 10. Consequently, the experimental (I/I m ) 2 should be much larger than the theoretical model [34].…”

“…The second peak (A 2 ) at a potential -0.67 V and third peak (A 3 ) at a potential (-0.41 V) corresponding to the dissolution of zinc from d-and c-phases, respectively. The fourth peak (A 4 ) at more noble potential characterizes the dissolution of nickel from g, c and d phases [33,34].…”

The Effect of TiO2Particulate Reinforcement on the Microstructure and Mechanical Properties of Binary Nano-Composite on Low Carbon Steel

“…The measurement of the low carbon steel (substrate) used was (45 x 40 x 20) mm 3 piece and zinc pieces of (85 x 45 x 5) mm 3 were prepared as anodes. The low carbon steels pecimens' chemical composition is displayed in Table 1.…”

“…Ever since the invention of galvanic coating technology, electrolytic metal coatings have been used in quite a lot of areas due to their exceptional properties [1][2][3]. Electrodeposited composite coatings are a surface engineering developed on the basis of electrolytic conducting coating [4][5][6].…”