Concept explainers
(a)
The corrosion current.
(a)
Answer to Problem 48AAP
The corrosion current is
Explanation of Solution
Write the expression for corrosion current.
Here, the corrosion mass is
Conclusion:
Consider the steel as iron and the anodic reaction of iron is expressed as follows.
Refer Table 13.1, “Standard electrode potentials at 25 °C”.
The anodic reaction of iron is as follows:
Here, the number of electrons produced is,
Refer Figure 2.3, “Periodic Table of Elements”
The atomic mass of iron is,
The corrosion time is 4 weeks.
Substitute
Thus, the corrosion current is
(b)
The corrosion density associated with corrosion current.
(b)
Answer to Problem 48AAP
The corrosion density associated with corrosion current is
Explanation of Solution
The corrosion density associated with corrosion current is nothing but the current
density
Write the formula for current density
Here, the current flow is
Conclusion:
The total surface area of the tank is expressed as follows.
Substitute
Thus, the corrosion density associated with corrosion current is
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Chapter 13 Solutions
FOUND.OF MTRLS.SCI+ENGR.(LL)-W/CONNECT
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