Properties of electrolytic zinc-nickel alloys, precipitated from weakly acidic chloride electrolytes

The effect of electrolysis parameters on the composition and structure of zinc-nickel coatings during their electrodeposition on a copper substrate from a weakly acidic chloride electrolyte with a Zn(II)/Ni(II) ratio of 1 was studied in this work. The chemical composition of the electrolytes was controlled by complexometric titration. The phase composition was studied using a Rigaku Ultima IV X-ray diffractometer. The gross composition was determined using a JEOL JSM-6460LV scanning electron microscope with computer control. It has been established that an increase in the current density increases the deposition rate of the alloy. It is shown that an increase in temperature leads to an increase in the proportion of nickel in the alloy and an increase in the rate of nickel deposition. An increase in temperature does not affect the rate of zinc deposition. At the same time, at temperatures below 60 °C, the deposition of the alloy is anomalous; at higher temperatures, the deposition becomes normal. The open and total porosity of the coating was determined, it was found that there is no open porosity, the total porosity is about 50%.