Ohm's Law of Corrosion Current

Comparing the potential difference between an anode and cathode to the geometry factor a corrosion current can be calculated.

One limiting factor is establishing the geometry factor and measurement of the anode and cathode on the small surface of a specimen.

𝐼 − Corrosion current(amps)
𝜌 − Electrolyte resistivity(ohm⁄cm)
𝐸_𝑐 − Potential difference between polarized cathode and a reference electrode,𝑉.
𝐸_𝑎 − Potential difference between polarized cathode and the same reference electrode,𝑉.
𝐾_𝑐 − Geometry factor for a cathode
𝐾_𝑎 − Geometry factor for an
 

Input Parameters

1. To create a new case, click the “Add Case” button
2. Select the Ohm’s Law of Corrosion Current application from the Pipeline Corrosion list.
3. Enter Case Name, Location, Date and any necessary notes.
4. Fill out all required fields.
5. Make sure the values you are inputting are in the correct units.
6. Click the CALCULATE button.

• Potential Difference between the Polarized Cathode and Reference Electrode(V)
• Potential Difference between the Polarized Anode and the Same Reference Electrode(V)
• Geometry Factor for a Cathode
• Geometry Ratio for an Anode
• Average Soil Resistivity(ohm-cm)

   

Outputs/Reports

1. View the results.
2. If an input parameter needs to be edited be sure to hit the CALCULATE button after the change.
3. To SAVE, fill out all required case details then click the SAVE button.
4. To rename an existing file, click the SAVE As button. Provide all case info then click SAVE.
5. To generate a REPORT, click the REPORT button.
6. The user may export the Case/Report by clicking the Export to Excel/PowerPoint icon.
7. To delete a case, click the DELETE icon near the top of the widget.

• Corrosion Current(A)

 

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