Tin (ρ=7.3 g/cm3 ) corrodes in a deaereted solution of pH 2. The activity of Sn2+ in the solution is 10^-3 M. The values of bc and ba are -0.12 and 0.1 V/decade, respectivly. The exchange current densities for the anodic and cathodic reactions are 10^-6 and 10^-8 A/cm2 , respectivly. Assume the tin surface acts as cathode, calculate the corrosion potential, corrosion density current (A/cm2 ) and corrosion rate in mpy.
Tin (ρ=7.3 g/cm3 ) corrodes in a deaereted solution of pH 2. The activity of Sn2+...
3. Tin (p-7.3 g/cm) corrodes in a deaereted solution of pH 2. The activity of Sn2 in the solution is 10-3 M. The values of be and ba are -0.12 and 0.1 V/decade, respectivly. The exchange current densities for the anodic and cathodic reactions are 10-6 and 10-8 A/cm2, respectivly. Assume the tin surface acts as cathode, calculate the corrosion potential, corrosion density current (A/cm2) and corrosion rate in mpy.
Question 3 (30 zinc in a hydrochloric acid solution with a pH 5 and a Zn2 concentration of 10-5 M. The cathodic (Be 0.12) V/decade and anodic Tafel slope (Po 0.15) V/decade, respectively. Corrosion potential and the corrosion current are Ecor 0.54V and Icor 1.65x10-*A/cm2, respectively. (a) Calculate the exchange current densities for the cathodic and anodic reactions are 1H2 -? and izn ?. Assume that charge-transfer kinetics controls the reaction rate and that the high-field approximation applies. (b) Evaluate...