Current and Potential Distributions for a Freely Corroding Disk Electrode

This Demonstration shows the process of corrosion in a disk-shaped metal electrode. The potential distribution (blue curves) and the current distribution (red curves) are shown on the left for the vertical distance represented by the red point. A contour plot of the equipotentials is shown on the right. You can vary the radius of the disk-shaped electrode (black bar) to investigate the affect of the size of the electrode on the corrosion.


  • [Snapshot]
  • [Snapshot]
  • [Snapshot]


The potential distribution for various vertical distances from the surface is shown on the left. For large distances, the potential differences are small; it is not possible to detect local processes (snapshot 1). At the near-surface distance, the potential distribution is more pronounced: a maximum at the center of the disk electrode and smaller values along the side of the electrode (snapshot 2).
Current flow is at a maximum at the electrode/insulator interface. The asymptotic behavior for an interface of results from the fact that the potential in the solution immediately adjacent to the electrode surface is parallel to the electrode. Thus, the current distribution is a maximum at the electrode/insulator interface and a minimum at the center of the electrode.
    • Share:

Embed Interactive Demonstration New!

Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details »

Files require Wolfram CDF Player or Mathematica.

Mathematica »
The #1 tool for creating Demonstrations
and anything technical.
Wolfram|Alpha »
Explore anything with the first
computational knowledge engine.
MathWorld »
The web's most extensive
mathematics resource.
Course Assistant Apps »
An app for every course—
right in the palm of your hand.
Wolfram Blog »
Read our views on math,
science, and technology.
Computable Document Format »
The format that makes Demonstrations
(and any information) easy to share and
interact with.
STEM Initiative »
Programs & resources for
educators, schools & students.
Computerbasedmath.org »
Join the initiative for modernizing
math education.
Step-by-Step Solutions »
Walk through homework problems one step at a time, with hints to help along the way.
Wolfram Problem Generator »
Unlimited random practice problems and answers with built-in step-by-step solutions. Practice online or make a printable study sheet.
Wolfram Language »
Knowledge-based programming for everyone.
Powered by Wolfram Mathematica © 2018 Wolfram Demonstrations Project & Contributors  |  Terms of Use  |  Privacy Policy  |  RSS Give us your feedback
Note: To run this Demonstration you need Mathematica 7+ or the free Mathematica Player 7EX
Download or upgrade to Mathematica Player 7EX
I already have Mathematica Player or Mathematica 7+