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 x 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.inner part of the steel pipe corroded more, because wet corrosion is faster than the dry corrosion

b. i would like to paint upper half. because by coating we are going to minimize the reaction rate of upper half ,so mean while the inner half also doesnot participate easily in the corrosion

c.internal half.

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