A piece of corroded steel plate was found in a submerged ocean vessel. It was estimated that the original area of the plate was 10 in2 and that approximately 2.6 kg had corroded away during the submersion. Assuming a corrosion penetration rate of 200 mpy for this alloy in seawater, estimate the time of submersion in years. (convert the time from hours to years). The density of steel is 7.9 g/cm3. K

10 years

Explanation:

The rate of corrosion (R) is given as:

Given that:

R = 200 mpy,

W is the weight loss of the metal after exposure in mg = 2.6 kg = 2.6 × 10⁶ mg,

t = time,

A = surface area of the metal exposed = 10 in²,

ρ = the density of the metal in g/cm³ =  7.9 g/cm³ and

constant K= 534 for CPR in mpy

From the rate of corrosion equation, rearranging to get:

Substituting to get:

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explanation: