Comparative study of Cu–Zn coatings electrodeposited from sulphate and chloride baths

Abstract

In this work, the effect of the nature of the salt anion (chloride and sulphate) in the Cu–Zn citrate bath was investigated, using cyclic voltammetry (CV) and chronoamperometry (CA). Experimental electrodeposition parameters (switching potential and imposed potential) were varied in order to examine their influence on the deposits. The coating microstructures were observed by scanning electron microscope (SEM-EDS), the coating phases were characterized by X-ray diffraction (XRD) analysis and the surface composition was assessed by XPS. Higher current efficiency was obtained in chloride baths compared to sulphate baths and best deposits were obtained at compared to and . Corrosion test results in 0.5 M NaCl solution show that Cu–Zn deposit produced from chloride bath exhibited the highest corrosion resistance.

Effect of thiourea on electrocrystallization of Cu–Sn alloys from sulphate electrolytes

“…In the 7 sulphate electrolyte without TU (Fig. 1a), reduction of copper ions occurs in the potential range of 300-80 mV that is typical for this type of electrolyte [31][32][33]. The addition of TU in the electrolyte (Fig.…”

Analytical Study of CuZn 30 and CuZn 39 Brass Surfaces in 3% NaCl Solution Under Polarization

“…Rp measures the resistance of material to the transfer of its electron to the electroactive species in solution, meaning that the greater it is, the higher brass resistance to general corrosion can be. In the case of alpha brasses in 3% NaCl after 1 h of immersion, the Rp values reach 4080 Ω cm 2 for CuZn 36 [25] and 4000 Ω cm 2 for CuZn 37 [16]. In the same experimental conditions for alpha beta brasses, the Rp value was estimated at 1410 Ω cm 2 for CuZn40 [26].…”

“…Brass is frequently exposed to solutions with a high chloride content [1], for example in the case of seawater desalination plants, due to its interesting properties such as high formability, electrical [2] and thermal conductivity, etc. [3,4].…”

Green and Controllable Preparation of Cu/Zn Alloys Using Combined Electrodeposition and Redox Replacement

“…Traditionally, cyanide has been used as the complexing agent for Cu/Zn alloy electroplating, ,, although concerns about environmental, health, and safety issues have been escalating due to the high toxicity. Various types of complexing agents have been investigated as alternatives to cyanide, such as oxalate, pyrophosphate, − ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid, triethanolamine, citrate, , glutamate, gluconate, tartrate, sorbitol, glycine, and glycerol . Nevertheless, the usage of such additives can increase the operating costs and burden of wastewater treatment. − Several attempts have been made using ionic liquids and deep eutectic solvents for brass electrodeposition due to their wide electrochemical windows, vapor pressure, and high ionic conductivity, − however, the commercial application of these nonaqueous electrolytes has so far been limited by their high prices.…”