The corrosion rate is illustrated by the image below. To calculate corrosion rate, three essential parameters are needed and these parameters are Current per Unit Time (i), Number of Electrons (n) and Faraday’s Constant (F).
The formula for calculating corrosion rate:
r = i/nF
Where:
r = Corrosion Rate
i = Current per Unit Time (Current Density)
n = Number of Electrons
F = Faraday’s Constant
Given an example;
Find the corrosion rate when the current per unit time is 15, the number of electrons is 5 and the faraday’s constant is 3.
This implies that;
i = Current per Unit Time (Current Density) = 15
n = Number of Electrons = 5
F = Faraday’s Constant = 3
r = i/nF
That is, r = 15/(5)(3)
r = 15/15
r = 1
Therefore, the corrosion rate is 1.
Calculating the Current per Unit Time when the Corrosion Rate, the Number of Electrons and the Faraday’s Constant are Given
i = r (nF)
Where:
i = Current per Unit Time (Current Density)
r = Corrosion Rate
n = Number of Electrons
F = Faraday’s Constant
Let’s solve an example;
Find the current per unit time when the corrosion rate is 10, the number of electrons is 8 and the faraday’s constant is 3.
This implies that;
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r = Corrosion Rate = 10
n = Number of Electrons = 8
F = Faraday’s Constant = 3
i = r (nF)
Then, i = 10 (8)(3)
i = 10 (24)
i = 240
Therefore, the current per unit time is 240.
Read more: How to Calculate and Solve for Concentration Polarization | Corrosion
Calculating the Number of Electrons when the Corrosion Rate, the Current per Unit Time and the Faraday’s Constant are Given
n = i / rF
Where:
n = Number of Electrons
r = Corrosion Rate
i = Current per Unit Time (Current Density)
F = Faraday’s Constant
Let’s solve an example;
Find the number of electrons when the corrosion rate is 4, the current per unit time is 20 and the faraday’s constant is 2.
This implies that;
r = Corrosion Rate = 4
i = Current per Unit Time (Current Density) = 20
F = Faraday’s Constant = 2
n = i / rF
So, n = 20 / (4)(2)
n = 20 / 8
n = 2.5
Therefore, the number of electrons is 2.5.
Calculating the Faraday’s Constant when the Corrosion Rate, the Current per Unit Time and the Number of Electrons are Given
F = i / rn
Where:
F = Faraday’s Constant
r = Corrosion Rate
i = Current per Unit Time (Current Density)
n = Number of Electrons
Let’s solve an example;
Find the faraday’s constant when the corrosion rate is 8, the current per unit time is 16 and number of electrons is 1.
This implies that;
r = Corrosion Rate = 8
i = Current per Unit Time (Current Density) = 16
n = Number of Electrons = 1
F = i / rn
F = 16 / (8)(1)
Then, F = 16 / 8
F = 2
Therefore, the faraday’s constant is 2.
Read more: How to Calculate and Solve for Rate Expansion of Metal | Corrosion
How to Calculate Corrosion Rate Using Nickzom Calculator
Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the corrosion rate.
To get the answer and workings of the corrosion rate using the Nickzom Calculator – The Calculator Encyclopedia. First, you need to obtain the app.
You can get this app via any of these means:
Web – https://www.nickzom.org/calculator-plus
To get access to the professional version via web, you need to register and subscribe to have utter access to all functionalities.
You can also try the demo version via https://www.nickzom.org/calculator
Android (Paid) – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator
Android (Free) – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator
Apple (Paid) – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8
Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Materials and Metallurgical under Engineering.
Now, Click on Corrosion under Materials and Metallurgical
Now, Click on Corrosion Rate under Corrosion
The screenshot below displays the page or activity to enter your values, to get the answer for the corrosion rate according to the respective parameter which is the Current per Unit Time (i), Number of Electrons (n) and Faraday’s Constant (F).
Now, enter the values appropriately and accordingly for the parameters as required by the Current per Unit Time (i) is 15, Number of Electrons (n) is 5 and Faraday’s Constant (F) is 3.
Finally, Click on Calculate
As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the corrosion rate and presents the formula, workings and steps too.
