The active dissolution of tin in acidic chloride electrolyte solutions — a rotating disc study

The anodic dissolution of tin in acidic chloride electrolyte has been investigated using the rotating disc technique. The dissolution reaction has a Tafel slope of 64 ±5 mV dec^–1 after the effects of diffusion are eliminated. The order of reaction with respect to Cl^– ion has been found to be unity. The measured currents were also found to depend onC_H+. The suggested mechanism involves quasi-reversible charge transfer.A possible explanation is given for the observed current-time behaviour at low anodic current densities.Notation i Current density - i₍₎ Current density at infinite rotation speed - i_d,Cl^– Limiting current density due to Cl^– diffusion - C_cl^– Concentration of chloride ion - C_H+ Concentration of hydrogen ion - d₀ Diffusion coefficient of oxidised species - k_b Rate constant for reduction of oxidised species - Kinematic viscosity - Angular velocity - Anodic transfer coefficient - Rate constant at standard equilibrium potential - Direction of reaction