Estimate the range of E_corr for a galvanic cell formed between the external upp

Question

Estimate the range of E_corr for a galvanic cell formed between the external upper steel pipe vertically immersed in the sea (see figure) and the external lower pipe buried in the seafloor. Refer the potential to SCE. Assume the pH of seawater is 7 and iron concentration in the deep seafloor is 1 Times 10^-6 M. Which part of the steel pipe will show excessive corrosion? If you have sufficient paint to coat one half of the steel pipe. Would you paint the upper half or the lower half? Is the driving force for galvanic corrosion higher internally or externally?

Explanation / Answer

a. Lower pipe will get excessive corrosion. because that part gets anodic character

b.I paint the upper part so that we can control its cathodic behaviour leads to control excessive corrosion of lower part

c.Internally, because that part exposed to electrolyte.

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