Enter the electrode potential and current density into the calculator to determine the Anodic Index.

## Anodic Index Formula

The following formula is used to calculate the Anodic Index.

AI = (E - Eref) / I

Variables:

- AI is the Anodic Index (V)
- E is the electrode potential (V)
- Eref is the reference electrode potential (V)
- I is the current density (A/m²)

To calculate the Anodic Index, subtract the reference electrode potential from the electrode potential. Then, divide the result by the current density.

## What is an Anodic Index?

The Anodic Index, also known as the Electrode Potential, is a measure of the tendency of a metal to corrode or oxidize. It is used in the field of corrosion engineering to predict the compatibility of different metals in contact with each other. A higher Anodic Index indicates a greater likelihood of corrosion. This index is crucial in preventing galvanic corrosion, which occurs when two different metals are in electrical contact in a conductive environment.

## How to Calculate Anodic Index?

The following steps outline how to calculate the Anodic Index (AI).

- First, determine the electrode potential (E) in volts (V).
- Next, determine the reference electrode potential (Eref) in volts (V).
- Next, determine the current density (I) in amperes per square meter (A/m²).
- Next, gather the formula from above: AI = (E – Eref) / I.
- Finally, calculate the Anodic Index (AI).
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

Electrode potential (E) = 0.8 V

Reference electrode potential (Eref) = 0.5 V

Current density (I) = 10 A/m²