What Is the Faraday Metal Loss Rate & Penetration Calculator?
Faraday’s Law connects electrical charge to chemical mass conversion: Q = n·F·N.
In corrosion engineering, it converts current density into direct wall thickness reduction per unit time.
How Does the Faraday Metal Loss Rate & Penetration Calculator Work?
Multiplying current by equivalent weight (M/n) and dividing by Faraday’s constant yields mass loss rate.
Dividing by metal density converts mass loss into linear thickness penetration (mm/year or mils/year).
Faraday Metal Loss Rate & Penetration Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Faraday electrochemical rate equation for uniform wall penetration.
How to Use the Faraday Metal Loss Rate & Penetration Calculator
- Input corrosion current density, atomic weight, valence, and density.
- Observe penetration rate in mm/year, mpy, and daily mass loss.
Step-by-Step Example Calculation
Carbon Steel Uniform Corrosion
Input Values:
Understanding Your Result
<0.025 mm/year (<1 mpy): Excellent resistance.
0.025–0.10 mm/year: Moderate corrosion.
>0.50 mm/year (>20 mpy): Severe corrosion requiring immediate mitigation.
Factors That Affect the Result
- Pitting corrosion localizes current into tiny cavities, causing penetration rates 10–100× higher than uniform Faraday rates.
When Should You Use This Calculator?
- Pipeline wall thinning analysis, refinery corrosion coupons, and autoclave testing interpretation.
Assumptions & Limitations
- Assumes uniform generalized corrosion across the exposed metal surface.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Fundamental stoichiometric electrochemical relationship.