Na2S-influenced electrochemical migration of tin in a thin electrolyte layer containing chloride ions

Sodium sulfide was used to prevent the formation of dendrites during the electrochemical migration of tin in chloride-containing thin electrolyte layers. This investigation was based on in situ electrochemical and optical techniques, as well as ex situ characterization. Results show that sodium sulfide can inhibit the electrochemical migration behavior of tin by precipitating tin ions on the anode side, and the inhibition effect strongly depends on concentration. The effects of an applied bias voltage and pH alterations in the system caused by Na2S hydrolysis were also studied. Proposals were made for the mechanisms involved to explain the role of sodium sulfide.