If you can please help with this question as much as you can, thanks.â
Q.4 [20 marks] 500 am) immersed in seawater The corrosion rate of a steel component (area has been determined to be icorr 104 A cm2 (a) Write down the anodic reaction for the corrosion of steel. [3 marks] (b) Write down the likely cathodic reaction given that the pH of seawater is about [3 marks] (c) Assuming the above corrosion rate, use Faraday's law (W ItMIn to calculate the mass of material (W) that will be lost from the component in 1 year of service. Note that t is the time, M is the atomic weight (55.8 g mo), F is the Faraday constant (96485 As mol) and n is the number electrons transferred in the anodic reaction [6 marks] year. The density of iron is 7.9 (d) Estimate the volume loss (cm-3) of material per g cm-3 [3 marks] (e) Calculate the corrosion rate in mmpy (millimetres per year) assuming uniformm corrosion. If the thickness of the component is 5 mm do you expect it to survive for its design life of 15 years? [5 marks]