Question

What is the corrosion current density of an iron metal in a 0.5 M hydrochloric acid solution when the measured electrochemical cell current is 2.5 mA and the surface area of the iron electrode is 5 cm²? All other experimental conditions remain constant.

Answer 1

The corrosion current density  i_corr  can be calculated using the formula:i_corr = I_corr / Awhere I_corr is the corrosion current  in mA  and A is the surface area of the electrode  in cm .Given the electrochemical cell current  I_corr  is 2.5 mA and the surface area of the iron electrode  A  is 5 cm, we can calculate the corrosion current density as follows:i_corr = 2.5 mA / 5 cm = 0.5 mA/cmSo, the corrosion current density of the iron metal in a 0.5 M hydrochloric acid solution is 0.5 mA/cm.