To calculate the anodic index, subtract the reference potential from the electrode potential and divide the result by the current passing through the electrode.
Anodic Index Calculator
Enter any 3 values to calculate the missing variable
The Anodic Index Calculator helps determine the difference in electrochemical potential between two metals, which is important when assessing corrosion risks in different environments. This index is critical in fields like construction, where different metals are combined, and helps prevent material degradation.
The anodic index measures the potential difference between metals in a galvanic series, with more anodic metals being more susceptible to corrosion.
Formula:
Contents
The formula to calculate the Anodic Index (AI) is:
Where:
- E = Electrode potential of the material
- Eref = Reference electrode potential
- I = Current through the electrode
How to Calculate ?
- Determine the electrode potential (E) of the material in volts.
- Find the reference electrode potential (Eref) in volts.
- Measure the current (I) passing through the electrode in amperes.
- Plug the values into the formula to calculate the anodic index.
Solved Calculations:
Example 1:
You have a metal with an electrode potential of 0.85 V and a reference electrode potential of 0.50 V. The current passing through the electrode is 2.5 A. Calculate the anodic index.
| Step | Calculation | Explanation |
|---|---|---|
| 1 | Formula: AI = (E – Eref) / I | Start with the formula. |
| 2 | AI = (0.85 – 0.50) / 2.5 | Plug in values for E, Eref, and I. |
| 3 | AI = 0.35 / 2.5 | Subtract the reference potential from the electrode potential. |
| 4 | AI = 0.14 V/A | Divide the result by the current to get the anodic index. |
Answer: The anodic index is 0.14 V/A.
Example 2:
A metal electrode has a potential of 1.20 V and the reference electrode potential is 0.80 V. The current measured is 3 A. Find the anodic index.
| Step | Calculation | Explanation |
|---|---|---|
| 1 | Formula: AI = (E – Eref) / I | Start with the formula. |
| 2 | AI = (1.20 – 0.80) / 3 | Insert the given values for E, Eref, and I. |
| 3 | AI = 0.40 / 3 | Subtract the reference potential from the electrode potential. |
| 4 | AI = 0.133 V/A | Divide the result by the current to get the anodic index. |
Answer: The anodic index is 0.133 V/A.
What is Anodic Index Calculator ?
The Anodic Index Calculator is a valuable tool used to determine the anodic index of various metals, which is crucial for understanding their corrosion resistance. The anodic index helps identify how a metal will behave in a galvanic cell, indicating its tendency to corrode when in contact with other metals.
The anodic index is often represented in charts, making it easier to compare different materials, such as 316 stainless steel and aluminum, regarding their electrochemical properties.
By knowing the anodic index of materials, engineers and designers can make informed decisions about material selection for applications where corrosion resistance is essential.
This calculator also assists in analyzing the anodic and cathodic sites in galvanic corrosion. Understanding these concepts is critical for preventing corrosion-related failures in structures and components.
Final Words:
Overall, the Anodic Index Calculator is an essential resource for anyone working with metals in environments where corrosion is a concern.
